CVE-2025-21826
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…
Does this matter?
Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.20% probability · 9th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- 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
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-503939.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.