7.8

CVE-2025-21826: linux

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-21826DEBIAN-CVE-2025-21826
Published 06-03-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21826 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.20%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 30 · Related 26
DLA-4102-1DLA-4178-1RHSA-2025:20095RHSA-2025:20518RHSA-2026:70484USN-7510-1

Timeline

  1. 06-03-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu124 products
  • linux< 5.15.0-140.150 | < 6.8.0-64.67
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1084.91 | < 6.8.0-1032.34
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 2d4c0798a1ef8db15b3277697ac2def4eda42312, < 6b467c8feac759f4c5c86d708beca2aa2b29584f | ≥ 77be8c495a3f841e88b46508cc20d3d7d3289da3, < 5083a7ae45003456c253e981b30a43f71230b4a3 | ≥ 9cb084df01e198119de477ac691d682fb01e80f3, < 2ac254343d3cf228ae0738b2615fedf85d000752 | ≥ dc45bb00e66a33de1abb29e3d587880e1d4d9a7e, < 82e491e085719068179ff6a5466b7387cc4bbf32 | ≥ 3ce67e3793f48c1b9635beb9bb71116ca1e51b58, < 49b7182b97bafbd5645414aff054b4a65d05823d | ≥ 3ce67e3793f48c1b9635beb9bb71116ca1e51b58, < ab50d0eff4a939d20c37721fd9766347efcdb6f6 | ≥ 3ce67e3793f48c1b9635beb9bb71116ca1e51b58, < 1b9335a8000fb70742f7db10af314104b6ace220 | ff67e3e488090908dc015ba04d7407d8bd467f7e | ≥ 5.10.209, < 5.10.235 | ≥ 5.15.148, < 5.15.179 | ≥ 6.1.75, < 6.1.129 | ≥ 6.6.14, < 6.6.76 | ≥ 6.7.2, < 6.8 | 6.8
  • linux_kernel≥ 5.10.209, < 5.10.235 | ≥ 5.15.148, < 5.15.179 | ≥ 6.1.75, < 6.1.129 | ≥ 6.6.14, < 6.6.76 | ≥ 6.7.2, < 6.12.13 | ≥ 6.13, < 6.13.2
Debian1 product
  • linux< 6.1.129-1 | < 6.12.13-1

3 vendors · 127 products

References

41 links
Show all 41 references