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CVE-2026-53000

netfilter: nat: use kfree_rcu to release ops

Products / packages Linux · Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat Enterprise Linux 9 · 5 more

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:20:30 UTC
Linux · CVSS:3.1 · 7.8
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
redhat-SADP · CVSS:3.1 · 7
Assessment vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

high7.8

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

Source guidance available

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

What this means

The Linux kernel is affected by a vulnerability in netfilter nat, where the use of kfree_rcu to release ops may cause issues. The vulnerability is present in versions 5.14 to 6.1.191, 6.6.160, 6.12.114, 6.18.33, and 7.0.10. The weakness is a release of an invalid pointer or reference.

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.

Linux · Linux

Linux

6 ranges
Linux version evidence

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

affected

e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 → before bf17f1d3b307196d9282c4b1dd8be0d0e5f8e529

git versions

e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 → before ede973d62d26d9c550269af05366ab9e30fc92ee

git versions

e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 → before 050f98e56782b14677c5bae50800e60775bbf6bb

git versions

e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 → before 32fdd2e38e7435a368d88f5977a7d6585ebc8b0e

git versions

e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 → before 3c7511f38ab511b791196b13ae48bf4973bf7dfd

git versions

e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 → before 6eda0d771f94267f73f57c94630aa47e90957915

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

8 ranges
Linux version evidence

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

affected

5.14

unaffected

0 → before 5.14

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.114 → through 6.12.*

semver versions

6.18.33 → through 6.18.*

semver versions

7.0.10 → through 7.0.*

semver versions

7.1 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Red Hat · redhat-SADP

Red Hat Enterprise Linux 10.0 Extended Update Support

1 range
redhat-SADP version evidence

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

affected

unaffected

0:6.12.0-55.98.1.el10_0 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux_eus:10.0

Red Hat · redhat-SADP

Red Hat Enterprise Linux 9

1 range
redhat-SADP version evidence

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

affected

unaffected

0:5.14.0-687.45.1.el9_8 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux:9cpe:/o:redhat:enterprise_linux:9

Red Hat · redhat-SADP

Red Hat Enterprise Linux 9.6 Extended Update Support

1 range
redhat-SADP version evidence

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

affected

unaffected

0:5.14.0-570.141.1.el9_6 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:rhel_eus:9.6

Red Hat · redhat-SADP

Red Hat Enterprise Linux 10

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:10

Red Hat · redhat-SADP

Red Hat Enterprise Linux 6

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:6

Red Hat · redhat-SADP

Red Hat Enterprise Linux 7

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:7

Red Hat · redhat-SADP

Red Hat Enterprise Linux 7

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:7

Red Hat · redhat-SADP

Red Hat Enterprise Linux 8

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat-SADP

Red Hat Enterprise Linux 8

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:8

Red Hat · redhat-SADP

Red Hat Enterprise Linux 9

0 ranges
redhat-SADP version evidence

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

affected

unaffected

unknown

Other versions: affected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:9
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.

RHSA-2026:55445: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)

redhat-SADP guidance ↗

RHSA-2026:68100: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)

redhat-SADP guidance ↗

RHSA-2026:67720: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)

redhat-SADP guidance ↗

RHSA-2026:64808: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)

redhat-SADP guidance ↗

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:

netfilter: nat: use kfree_rcu to release ops

Florian Westphal says:

"Historically this is not an issue, even for normal base hooks: the data path doesn't use the original nf_hook_ops that are used to register the callbacks.

However, in v5.14 I added the ability to dump the active netfilter hooks from userspace.

This code will peek back into the nf_hook_ops that are available at the tail of the pointer-array blob used by the datapath.

The nat hooks are special, because they are called indirectly from the central nat dispatcher hook. They are currently invisible to the nfnl hook dump subsystem though.

But once that changes the nat ops structures have to be deferred too."

Update nf_nat_register_fn() to deal with partial exposition of the hooks from error path which can be also an issue for nfnetlink_hook.

References

13 sources
access.redhat.com/errata/RHSA-2026:55445
Vendor advisoryredhat-SADP
access.redhat.com/errata/RHSA-2026:68100
Vendor advisoryredhat-SADP
access.redhat.com/errata/RHSA-2026:67720
Vendor advisoryredhat-SADP
access.redhat.com/errata/RHSA-2026:64808
Vendor advisoryredhat-SADP
git.kernel.org/stable/c/bf17f1d3b307196d9282c4b1dd8be0d0e5f8e529
Source referenceLinux
git.kernel.org/stable/c/ede973d62d26d9c550269af05366ab9e30fc92ee
Source referenceLinux
View 7 more references
git.kernel.org/stable/c/050f98e56782b14677c5bae50800e60775bbf6bb
Source referenceLinux
git.kernel.org/stable/c/32fdd2e38e7435a368d88f5977a7d6585ebc8b0e
Source referenceLinux
git.kernel.org/stable/c/3c7511f38ab511b791196b13ae48bf4973bf7dfd
Source referenceLinux
git.kernel.org/stable/c/6eda0d771f94267f73f57c94630aa47e90957915
Source referenceLinux
access.redhat.com/security/cve/CVE-2026-53000
Security advisoryredhat-SADP
bugzilla.redhat.com/show_bug.cgi
Source referenceredhat-SADP
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53000.json
Security advisoryredhat-SADP

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-2026-53000

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-763 ↗

CWE-763 Release of Invalid Pointer or Reference

CISA-ADP

Related →

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): 5.14

Before: 6.1.191

Vulnerable product

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

From (inclusive): 5.14

Before: 6.6.160

Vulnerable product

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

From (inclusive): 5.14

Before: 6.12.114

Vulnerable product

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

From (inclusive): 5.14

Before: 6.18.33

Vulnerable product

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

From (inclusive): 5.14

Before: 7.0.10

Vulnerable product

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

From (inclusive): 5.14

Before: 7.1

Applicability preview
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.14",
            "versionEndExcluding": "6.1.191"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.14",
            "versionEndExcluding": "6.6.160"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.14",
            "versionEndExcluding": "6.12.114"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.14",
            "versionEndExcluding": "6.18.33"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.14",
            "versionEndExcluding": "7.0.10"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.14",
            "versionEndExcluding": "7.1"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 3
Linux

Assigning organization

2026-10-30
redhat-SADP

Additional data publisher

2026-09-17
CISA-ADP

Additional data publisher

2026-10-19

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
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

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