CVE-2025-21826

Medium

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject mismatching sum of field_len with set key length The field length description provides the length of each separated key field in the concatenation, each field gets rounded up to 32-bits to calculate the pipapo rule width from pipapo_init(). The set key length provides the total size of the key aligned to 32-bits. Register-based arithmetics still allows for combining mismatching set key length and field length description, eg. set key length 10 and field description [ 5, 4 ] leading to pipapo width of 12.

Package Linux Kernel
Published 2025-03-06
Last modified 2026-05-12
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 5.10.209, 5.15.148, 6.1.75, 6.6.14, 6.7.2, 6.8 and later are affected. Fixed in 5.10.235, 5.15.179, 6.1.129, 6.6.76, 6.12.13, 6.13.2, 6.14 and their respective stable series.

Affected from
≥ 5.10.209 ≥ 5.15.148 ≥ 6.1.75 ≥ 6.6.14 ≥ 6.7.2 ≥ 6.8
Fixed in
✓ 5.10.235 5.10.x ✓ 5.15.179 5.15.x ✓ 6.1.129 6.1.x ✓ 6.6.76 6.6.x ✓ 6.12.13 6.12.x ✓ 6.13.2 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21826 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

7 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2025-21826?

    CVE-2025-21826 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.10.209 onward and has been patched in 5.10.235, 5.15.179, 6.1.129 and others. CVE-2025-21826 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-21826?

    CVE-2025-21826 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2025-21826?

    Yes — CVE-2025-21826 has been patched. Fixed versions include 5.10.235, 5.15.179, 6.1.129 and others. If you are running Linux kernel 5.10.209 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2025-21826 actively exploited?

    No — CVE-2025-21826 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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