CVE-2025-21826
netfilter: nf_tables: reject mismatching sum of field_len with set key length
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.
INFO
Published Date :
March 6, 2025, 4:15 p.m.
Last Modified :
Nov. 3, 2025, 9:19 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply the latest Linux kernel security patches.
- Recompile the kernel with the fix if necessary.
- Restart affected systems after the update.
Public PoC/Exploit Available at Github
CVE-2025-21826 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-21826.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-21826 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-21826
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
discovered zero day/CVEs exploits on the nubia redmagic 9spro models, 9.06.2025
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-21826 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-21826 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 03, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 03, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html -
Initial Analysis by [email protected]
Oct. 30, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.13.2 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10.209 up to (excluding) 5.10.235 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15.148 up to (excluding) 5.15.179 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.75 up to (excluding) 6.1.129 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.14 up to (excluding) 6.6.76 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7.2 up to (excluding) 6.12.13 Added Reference Type kernel.org: https://git.kernel.org/stable/c/1b9335a8000fb70742f7db10af314104b6ace220 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2ac254343d3cf228ae0738b2615fedf85d000752 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/49b7182b97bafbd5645414aff054b4a65d05823d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5083a7ae45003456c253e981b30a43f71230b4a3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6b467c8feac759f4c5c86d708beca2aa2b29584f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/82e491e085719068179ff6a5466b7387cc4bbf32 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ab50d0eff4a939d20c37721fd9766347efcdb6f6 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 13, 2025
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/5083a7ae45003456c253e981b30a43f71230b4a3 Added Reference https://git.kernel.org/stable/c/6b467c8feac759f4c5c86d708beca2aa2b29584f -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 06, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/1b9335a8000fb70742f7db10af314104b6ace220 Added Reference https://git.kernel.org/stable/c/2ac254343d3cf228ae0738b2615fedf85d000752 Added Reference https://git.kernel.org/stable/c/49b7182b97bafbd5645414aff054b4a65d05823d Added Reference https://git.kernel.org/stable/c/82e491e085719068179ff6a5466b7387cc4bbf32 Added Reference https://git.kernel.org/stable/c/ab50d0eff4a939d20c37721fd9766347efcdb6f6