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Back to active CVEs
High · CVSS 8.1CVE-2025-40204

sctp: Fix MAC comparison to be constant-timeCVE-2025-40204

Answer in brief

CVE-2025-40204 records a High severity (CVSS 8.1) vulnerability in sctp: Fix MAC comparison to be constant-time. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 12, 2025Updated Oct 19, 2026Source checked Nov 4, 2026First seen by HOL Aug 5, 2026Material review Oct 19, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 4, 2026
References
8 linked sources
Open source record

Key facts

Risk
High · CVSS 8.1
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b93fa8dc521d00d2d44bf034fb90e0d79b036617 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0e8b8c326c2a6de4d837b1bb034ea704f4690d77 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9c05d44ec24126fc283835b68f82dba3ae985209 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ed3044b9c810c5c24eb2830053fbfe5fd134c5d4 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8019b3699289fce3f10b63f98601db97b8d105b0 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0b32ff285ff6f6f1ac1d9495787ccce8837d6405 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dd91c79e4f58fbe2898dac84858033700e0e99fbb93fa8dc521d00d2d44bf034fb90e0d79b036617, 0e8b8c326c2a6de4d837b1bb034ea704f4690d77, 1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c, 9c05d44ec24126fc283835b68f82dba3ae985209, ed3044b9c810c5c24eb2830053fbfe5fd134c5d4, 8019b3699289fce3f10b63f98601db97b8d105b0, 0b32ff285ff6f6f1ac1d9495787ccce8837d6405, dd91c79e4f58fbe2898dac84858033700e0e99fb
Linux/Linuxgeneric2.6.12Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to b93fa8dc521d00d2d44bf034fb90e0d79b036617 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 12, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.