8.1

CVE-2025-40204: linux

CVSS: 8.1v3.1HighDeferred
AliasesUBUNTU-CVE-2025-40204DEBIAN-CVE-2025-40204
Published 12-11-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-40204 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.47% chance of exploitation in the next 30 days, higher than 39.1% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.47%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 170 · Related 168
DLA-4379-1DLA-4404-1OPENSUSE-SU-2025:20172-1SUSE-SU-2025:4393-1SUSE-SU-2025:4422-1SUSE-SU-2025:4505-1

Showing 100 of 170. Use Open JSON for the complete list.

Timeline

  1. 12-11-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.47%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

+0.03 pp

From 0.43% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.47%

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

Ubuntu153 products
  • linuxAll versions (No fix recorded) | < 5.15.0-170.180 | < 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1100.107 | < 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.17.6-1
Linux1 product
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b93fa8dc521d00d2d44bf034fb90e0d79b036617 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0e8b8c326c2a6de4d837b1bb034ea704f4690d77 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9c05d44ec24126fc283835b68f82dba3ae985209 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ed3044b9c810c5c24eb2830053fbfe5fd134c5d4 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8019b3699289fce3f10b63f98601db97b8d105b0 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0b32ff285ff6f6f1ac1d9495787ccce8837d6405 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < dd91c79e4f58fbe2898dac84858033700e0e99fb | 2.6.12

3 vendors · 155 products

References

42 links
Show all 42 references