CVE-2025-21826

Summary

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.

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/1b9335a8000fb70742f7db10af314104b6ace220 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/1b9335a8000fb70742f7db10af314104b6ace220Patch
• https://git.kernel.org/stable/c/2ac254343d3cf228ae0738b2615fedf85d000752Patch
• https://git.kernel.org/stable/c/49b7182b97bafbd5645414aff054b4a65d05823dPatch
• https://git.kernel.org/stable/c/5083a7ae45003456c253e981b30a43f71230b4a3Patch
• https://git.kernel.org/stable/c/6b467c8feac759f4c5c86d708beca2aa2b29584fPatch
• https://git.kernel.org/stable/c/82e491e085719068179ff6a5466b7387cc4bbf32Patch
• https://git.kernel.org/stable/c/ab50d0eff4a939d20c37721fd9766347efcdb6f6Patch
• https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html