CVE-2026-78408

Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority

Products / packages Red Hat Enterprise Linux 10 · Red Hat Cost Management On-Premise 1 · Red Hat Hardened Images · 5 more

Published 02/09/2026, 15:05:33 UTC

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 05/11/2026, 06:00:33 UTC

redhat · CVSS:3.1 · 7.9

Assessment vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H

Severity

high7.9

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Exploit reference published

Source-linked evidence; not proof of attacks in the wild or independent validation.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

The nsenter --join-cgroup option in util-linux leaks root cgroup migration authority, allowing an unprivileged user to migrate and terminate unrelated root processes after a privileged operator uses --join-cgroup against an attacker-controlled target. The vulnerability requires the attacker to have access to the target cgroup. The exact affected versions are not specified.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Red Hat · redhat

Red Hat Enterprise Linux 10

1 range

redhat version evidence

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unaffected

0:2.40.2-18.el10_2.20 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:10.2

Red Hat · redhat

Red Hat Cost Management On-Premise 1

1 range

redhat version evidence

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Compare with this publisher’s ranges. This does not inspect your installation.

unaffected

1793825318 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cost_management_on_premise:1::el10

Red Hat · redhat

Red Hat Hardened Images

1 range

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

unaffected

2.42.2-3.4.hum1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:hummingbird:1

Red Hat · redhat

Red Hat Enterprise Linux 7

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/o:redhat:rhel_els:7

Red Hat · redhat

Red Hat Enterprise Linux 8

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Enterprise Linux 9

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:9

Red Hat · redhat

Red Hat Enterprise Linux 9

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:9

Red Hat · redhat

Red Hat Enterprise Linux 9

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:9

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 5

0 ranges

redhat version evidence

Check a product version

Compare with this publisher’s ranges. This does not inspect your installation.

Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:openshift:5

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Upgrade to util-linux v2.41.6, v2.42.3, or later. Until a fix is applied, do not run nsenter --join-cgroup (including nsenter --target PID --all --join-cgroup) against untrusted processes or namespaces. The fix closes the cgroup.procs descriptor immediately after joining, and opens it with O_CLOEXEC.

redhat guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

The sources identify public exploit references. We have not independently tested them; their availability does not establish exploitation in the wild.

util-linux/util-linux · security/advisories/GHSA-55fx-f4gg-cfhj ↗Attributed to CISA-ADP

Original source description

Read the full publisher description

The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.

References

7 sources

access.redhat.com/errata/RHSA-2026:63162

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:93461

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:95365

Vendor advisoryredhat

access.redhat.com/security/cve/CVE-2026-78408

Security advisoryredhat

bugzilla.redhat.com/show_bug.cgi

Source referenceredhat

util-linux/util-linux · security/advisories/GHSA-55fx-f4gg-cfhj

Public exploit referenceredhat · CISA-ADP

View 1 more references

www.openwall.com/lists/oss-security/2026/09/05/2

Security advisoryCVE

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance

Weakness classification

Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-78408

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-775 ↗

Missing Release of File Descriptor or Handle after Effective Lifetime

redhat

Contributing organizations · 3

redhat

Assigning organization

2026-11-05

CISA-ADP

Additional data publisher

2026-09-04

CVE

Additional data publisher

2026-09-05

Timeline

All times UTC

2 Sept 2026, 15:05
Advisory published
Publication date supplied by the source.
5 Nov 2026, 02:43
Source updated
Latest modification date supplied by the source.
5 Nov 2026, 03:15
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-784082026-11-05

Observed 2026-11-05T03:15:18.578Z · upstream updated 2026-11-05T02:43:52.916Z

Product or version evidence changed

before

[
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [
      {
        "version": "0:2.40.2-18.el10_2.20",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
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      "cpe:/o:redhat:enterprise_linux:10.2"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Hardened Images",
    "platforms": [],
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        "versionType": "rpm"
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    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:hummingbird:1"
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:7"
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8",
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    "defaultStatus": "unaffected",
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      "cpe:/o:redhat:enterprise_linux:8"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 5",
    "platforms": [],
    "versions": [],
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    ],
    "source": "redhat",
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  }
]

after

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    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [
      {
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        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
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      "cpe:/o:redhat:enterprise_linux:10.2"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Cost Management On-Premise 1",
    "platforms": [],
    "versions": [
      {
        "version": "1793825318",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:cost_management_on_premise:1::el10"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Hardened Images",
    "platforms": [],
    "versions": [
      {
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        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:hummingbird:1"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
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      "cpe:/o:redhat:rhel_els:7"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
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      "cpe:/a:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
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      "cpe:/a:redhat:enterprise_linux:9"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 5",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:5"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  }
]

References changed

before

[
  "https://access.redhat.com/errata/RHSA-2026:63162",
  "https://access.redhat.com/errata/RHSA-2026:93461",
  "https://access.redhat.com/security/cve/CVE-2026-78408",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2522497",
  "https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj",
  "http://www.openwall.com/lists/oss-security/2026/09/05/2"
]

after

[
  "https://access.redhat.com/errata/RHSA-2026:63162",
  "https://access.redhat.com/errata/RHSA-2026:93461",
  "https://access.redhat.com/errata/RHSA-2026:95365",
  "https://access.redhat.com/security/cve/CVE-2026-78408",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2522497",
  "https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj",
  "http://www.openwall.com/lists/oss-security/2026/09/05/2"
]

CVE · CVE-2026-784082026-11-02

Observed 2026-11-02T05:30:43.000Z · upstream updated 2026-11-02T05:16:11.411Z

Product or version evidence changed

before

[
  {
    "vendor": "Red Hat",
    "name": "Red Hat Hardened Images",
    "platforms": [],
    "versions": [
      {
        "version": "2.42.2-3.4.hum1",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:hummingbird:1"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:10"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:8"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 5",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:5"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  }
]

after

[
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [
      {
        "version": "0:2.40.2-18.el10_2.20",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:10.2"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Hardened Images",
    "platforms": [],
    "versions": [
      {
        "version": "2.42.2-3.4.hum1",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:hummingbird:1"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:8"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:9"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat OpenShift Container Platform 5",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:openshift:5"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78408"
  }
]

References changed

before

[
  "https://access.redhat.com/errata/RHSA-2026:63162",
  "https://access.redhat.com/security/cve/CVE-2026-78408",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2522497",
  "https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj",
  "http://www.openwall.com/lists/oss-security/2026/09/05/2"
]

after

[
  "https://access.redhat.com/errata/RHSA-2026:63162",
  "https://access.redhat.com/errata/RHSA-2026:93461",
  "https://access.redhat.com/security/cve/CVE-2026-78408",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2522497",
  "https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj",
  "http://www.openwall.com/lists/oss-security/2026/09/05/2"
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: 0.19% estimated probability in the next 30 days. 2026-10-30 · FIRST EPSS.

CISA-ADP · SSVC

CISA Coordinator · 2026-09-04

Exploitation: poc
Automatable: no
Technical Impact: partial

SSVC describes the publisher’s decision context. Your organization’s exposure and priorities may differ.

Record identifiers

Aliases: None recorded

Source evidence

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CVE CVE-2026-78408

Enrichment coverage

NVDAvailable

Checked 30/10/2026, 15:40:41 UTC

GHSANo result

Checked 30/10/2026, 15:40:40 UTC

EUVDRefresh failed

Previous evidence retained where available.

EPSSAvailable

Checked 30/10/2026, 15:40:43 UTC

Additional source evidence

NVD · CVE-2026-78408

CVSS 7.9 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H

Checked 30/10/2026, 15:40:41 UTC

FIRST EPSS · CVE-2026-78408

EPSS 0.19% probability of exploitation in the next 30 days. Percentile: 9.06% · 2026-10-30

Checked 30/10/2026, 15:40:43 UTC

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority

Severity and exploitation

What this means

Attack conditions

Affected versions

Red Hat Enterprise Linux 10

affected

unaffected

unknown

Red Hat Cost Management On-Premise 1

affected

unaffected

unknown

Red Hat Hardened Images

affected

unaffected

unknown

Red Hat Enterprise Linux 7

affected

unaffected

unknown

Red Hat Enterprise Linux 8

affected

unaffected

unknown

Red Hat Enterprise Linux 9

affected

unaffected

unknown

Red Hat Enterprise Linux 9

affected

unaffected

unknown

Red Hat Enterprise Linux 9

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 4

affected

unaffected

unknown

Red Hat OpenShift Container Platform 5

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Underlying weaknesses

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed