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CVE-2026-99244

pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper

Products / packages Linux

Published

Share

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 06/11/2026, 21:10:31 UTC

Severity

unknown

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

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

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.

Linux · Linux

Linux

15 ranges

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

affected

edd2754a62bee8d97b4808a15de024f66a1ddccf → before 2c20ace1698d03a23467351be1d281e89b36ade3

git versions

3466abafa9f4f81a869da828e52a12f693175ec2 → before 9ab0324f4868eeb20c63f063a1e5bc01d5539212

git versions

7fea700e04bd3f424c2d836e98425782f97b494e → before 30b274508c743f243c82904954c4e416d7143d4c

git versions

7fea700e04bd3f424c2d836e98425782f97b494e → before 70178691c467c8f9f722765299fd8524c3121a35

git versions

7fea700e04bd3f424c2d836e98425782f97b494e → before 3d15ac36ce174477efa5365e424dbd47950fd2b9

git versions

7fea700e04bd3f424c2d836e98425782f97b494e → before f46cd8241d9b83f2279cc0db3e9d3e181b548a59

git versions

7fea700e04bd3f424c2d836e98425782f97b494e → before 5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2

git versions

82c7acf9a12c9b4e4b0aba531de82b4e39a345c8

git versions

8e69e589f233ca2c9631f5af2b94f95dfc2ba804

git versions

09ab5b424b17cfe633db58bb2f9edbaf9484cf20

git versions

6.1.95 → before 6.1.191

semver versions

6.6.35 → before 6.6.161

semver versions

5.10.221 → before 5.11

semver versions

5.15.162 → before 5.16

semver versions

6.9.6 → before 6.10

semver versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

9 ranges

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

affected

6.10

unaffected

0 → before 6.10

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.161 → through 6.6.*

semver versions

6.12.115 → through 6.12.*

semver versions

6.18.60 → through 6.18.*

semver versions

7.2.14 → through 7.2.*

semver versions

7.3.1 → through 7.3.*

semver versions

7.4-rc1 → through *

original_commit_for_fix versions

unknown

Other versions: affected

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.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

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

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

pid_namespace: prevent TIF_NOTIFY_SIGNAL from interrupting the reaper

Since commit 7fea700e04bd ("zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING") zap_pid_ns_processes() clears TIF_NOTIFY_SIGNAL before every kernel_wait4() call. Otherwise kernel_wait4() doesn't sleep and returns -ERESTARTSYS if signal_pending() is true and the reaper busy-waits.

But clearing TIF_NOTIFY_SIGNAL doesn't fix it. It can get raised again. For example, klp_send_signals() sets it raw against any task that hasn't transitioned yet. And it keeps sending it until the livepatch finishes.

The sleep loop waiting for pid_allocated to drop has the same problem and it doesn't even clear anything. So a schedule() in TASK_INTERRUPTIBLE returns immediately.

Use a no_notify_signal guard. signal_pending() will ignore TIF_NOTIFY_SIGNAL and the pid namespace reaper sleeps until a child exits or free_pid() wakes it.

References

7 sources

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

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

Original records

CVE-2026-99244

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

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.1.95

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6.35

Before: 6.6.161

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.10

Before: 6.12.115

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.10

Before: 6.18.60

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.10

Before: 7.2.14

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.10

Before: 7.3.1

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.10

Before: 7.4-rc1

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.10.221

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.15.162

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.9.6

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.1.95",
            "versionEndExcluding": "6.1.191"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.6.35",
            "versionEndExcluding": "6.6.161"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.10",
            "versionEndExcluding": "6.12.115"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.10",
            "versionEndExcluding": "6.18.60"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.10",
            "versionEndExcluding": "7.2.14"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.10",
            "versionEndExcluding": "7.3.1"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.10",
            "versionEndExcluding": "7.4-rc1"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.10.221"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.15.162"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.9.6"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-11-03

Timeline

All times UTC
  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-99244

    Observed 2026-11-03T19:50:59.008Z · upstream updated 2026-11-03T19:13:09.510Z

    Product or version evidence changed

    before

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            "versionType": "git"
          },
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            "version": "3466abafa9f4f81a869da828e52a12f693175ec2",
            "status": "affected",
            "lessThan": "9ab0324f4868eeb20c63f063a1e5bc01d5539212",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "30b274508c743f243c82904954c4e416d7143d4c",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "70178691c467c8f9f722765299fd8524c3121a35",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "3d15ac36ce174477efa5365e424dbd47950fd2b9",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "f46cd8241d9b83f2279cc0db3e9d3e181b548a59",
            "versionType": "git"
          },
          {
            "version": "82c7acf9a12c9b4e4b0aba531de82b4e39a345c8",
            "status": "affected",
            "versionType": "git"
          },
          {
            "version": "8e69e589f233ca2c9631f5af2b94f95dfc2ba804",
            "status": "affected",
            "versionType": "git"
          },
          {
            "version": "09ab5b424b17cfe633db58bb2f9edbaf9484cf20",
            "status": "affected",
            "versionType": "git"
          },
          {
            "version": "6.1.95",
            "status": "affected",
            "lessThan": "6.1.191",
            "versionType": "semver"
          },
          {
            "version": "6.6.35",
            "status": "affected",
            "lessThan": "6.6.161",
            "versionType": "semver"
          },
          {
            "version": "5.10.221",
            "status": "affected",
            "lessThan": "5.11",
            "versionType": "semver"
          },
          {
            "version": "5.15.162",
            "status": "affected",
            "lessThan": "5.16",
            "versionType": "semver"
          },
          {
            "version": "6.9.6",
            "status": "affected",
            "lessThan": "6.10",
            "versionType": "semver"
          }
        ],
        "defaultStatus": "unaffected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99244"
      },
      {
        "vendor": "Linux",
        "name": "Linux",
        "platforms": [],
        "versions": [
          {
            "version": "6.10",
            "status": "affected"
          },
          {
            "version": "0",
            "status": "unaffected",
            "lessThan": "6.10",
            "versionType": "semver"
          },
          {
            "version": "6.1.191",
            "status": "unaffected",
            "lessThanOrEqual": "6.1.*",
            "versionType": "semver"
          },
          {
            "version": "6.6.161",
            "status": "unaffected",
            "lessThanOrEqual": "6.6.*",
            "versionType": "semver"
          },
          {
            "version": "6.12.115",
            "status": "unaffected",
            "lessThanOrEqual": "6.12.*",
            "versionType": "semver"
          },
          {
            "version": "6.18.60",
            "status": "unaffected",
            "lessThanOrEqual": "6.18.*",
            "versionType": "semver"
          },
          {
            "version": "7.2.14",
            "status": "unaffected",
            "lessThanOrEqual": "7.2.*",
            "versionType": "semver"
          },
          {
            "version": "7.3.1",
            "status": "unaffected",
            "lessThanOrEqual": "7.3.*",
            "versionType": "semver"
          }
        ],
        "defaultStatus": "affected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99244"
      }
    ]

    after

    [
      {
        "vendor": "Linux",
        "name": "Linux",
        "platforms": [],
        "versions": [
          {
            "version": "edd2754a62bee8d97b4808a15de024f66a1ddccf",
            "status": "affected",
            "lessThan": "2c20ace1698d03a23467351be1d281e89b36ade3",
            "versionType": "git"
          },
          {
            "version": "3466abafa9f4f81a869da828e52a12f693175ec2",
            "status": "affected",
            "lessThan": "9ab0324f4868eeb20c63f063a1e5bc01d5539212",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "30b274508c743f243c82904954c4e416d7143d4c",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "70178691c467c8f9f722765299fd8524c3121a35",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "3d15ac36ce174477efa5365e424dbd47950fd2b9",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "f46cd8241d9b83f2279cc0db3e9d3e181b548a59",
            "versionType": "git"
          },
          {
            "version": "7fea700e04bd3f424c2d836e98425782f97b494e",
            "status": "affected",
            "lessThan": "5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2",
            "versionType": "git"
          },
          {
            "version": "82c7acf9a12c9b4e4b0aba531de82b4e39a345c8",
            "status": "affected",
            "versionType": "git"
          },
          {
            "version": "8e69e589f233ca2c9631f5af2b94f95dfc2ba804",
            "status": "affected",
            "versionType": "git"
          },
          {
            "version": "09ab5b424b17cfe633db58bb2f9edbaf9484cf20",
            "status": "affected",
            "versionType": "git"
          },
          {
            "version": "6.1.95",
            "status": "affected",
            "lessThan": "6.1.191",
            "versionType": "semver"
          },
          {
            "version": "6.6.35",
            "status": "affected",
            "lessThan": "6.6.161",
            "versionType": "semver"
          },
          {
            "version": "5.10.221",
            "status": "affected",
            "lessThan": "5.11",
            "versionType": "semver"
          },
          {
            "version": "5.15.162",
            "status": "affected",
            "lessThan": "5.16",
            "versionType": "semver"
          },
          {
            "version": "6.9.6",
            "status": "affected",
            "lessThan": "6.10",
            "versionType": "semver"
          }
        ],
        "defaultStatus": "unaffected",
        "cpes": [],
        "source": "Linux",
        "url": "https://www.cve.org/CVERecord?id=CVE-2026-99244"
      },
      {
        "vendor": "Linux",
        "name": "Linux",
        "platforms": [],
        "versions": [
          {
            "version": "6.10",
            "status": "affected"
          },
          {
            "version": "0",
            "status": "unaffected",
            "lessThan": "6.10",
            "versionType": "semver"
          },
          {
            "version": "6.1.191",
            "status": "unaffected",
            "lessThanOrEqual": "6.1.*",
            "versionType": "semver"
          },
          {
            "version": "6.6.161",
            "status": "unaffected",
            "lessThanOrEqual": "6.6.*",
            "versionType": "semver"
          },
          {
            "version": "6.12.115",
            "status": "unaffected",
            "lessThanOrEqual": "6.12.*",
            "versionType": "semver"
          },
          {
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            "status": "unaffected",
            "lessThanOrEqual": "6.18.*",
            "versionType": "semver"
          },
          {
            "version": "7.2.14",
            "status": "unaffected",
            "lessThanOrEqual": "7.2.*",
            "versionType": "semver"
          },
          {
            "version": "7.3.1",
            "status": "unaffected",
            "lessThanOrEqual": "7.3.*",
            "versionType": "semver"
          },
          {
            "version": "7.4-rc1",
            "status": "unaffected",
            "lessThanOrEqual": "*",
            "versionType": "original_commit_for_fix"
          }
        ],
        "defaultStatus": "affected",
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      }
    ]
    References changed

    before

    [
      "https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3",
      "https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212",
      "https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c",
      "https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35",
      "https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9",
      "https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59"
    ]

    after

    [
      "https://git.kernel.org/stable/c/2c20ace1698d03a23467351be1d281e89b36ade3",
      "https://git.kernel.org/stable/c/9ab0324f4868eeb20c63f063a1e5bc01d5539212",
      "https://git.kernel.org/stable/c/30b274508c743f243c82904954c4e416d7143d4c",
      "https://git.kernel.org/stable/c/70178691c467c8f9f722765299fd8524c3121a35",
      "https://git.kernel.org/stable/c/3d15ac36ce174477efa5365e424dbd47950fd2b9",
      "https://git.kernel.org/stable/c/f46cd8241d9b83f2279cc0db3e9d3e181b548a59",
      "https://git.kernel.org/stable/c/5c0985dd3c32fc2bbd0e8beaf13cf52cd97376a2"
    ]
    Environment requirements changed

    before

    [
      {
        "source": "Linux",
        "statements": [
          {
            "nodes": [
              {
                "operator": "OR",
                "negate": false,
                "cpeMatch": [
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.1.95",
                    "versionEndExcluding": "6.1.191"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.6.35",
                    "versionEndExcluding": "6.6.161"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "6.12.115"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "6.18.60"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "7.2.14"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "7.3.1"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "5.10.221"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "5.15.162"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.9.6"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]

    after

    [
      {
        "source": "Linux",
        "statements": [
          {
            "nodes": [
              {
                "operator": "OR",
                "negate": false,
                "cpeMatch": [
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.1.95",
                    "versionEndExcluding": "6.1.191"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.6.35",
                    "versionEndExcluding": "6.6.161"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "6.12.115"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "6.18.60"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "7.2.14"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "7.3.1"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.10",
                    "versionEndExcluding": "7.4-rc1"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "5.10.221"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "5.15.162"
                  },
                  {
                    "vulnerable": true,
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "versionStartIncluding": "6.9.6"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]

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

Showing up to 50 most recent observed changes.