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CVE record · CVE-2026-80587

mptcp: avoid combining some incoming suboptions

CVSS 9.8 CriticalCriticalEPSS 0.0052 · 44th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the CVE Program (CNA: Linux) at 26 Aug 2026, 14:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Linux Linux
  • affected eda7acddf8080bb2d022a8d4b8b2345eb80c63ec to before 0e2210af439755a2af352eea4178261dcf61742e git
  • affected eda7acddf8080bb2d022a8d4b8b2345eb80c63ec to before d1bce616636c1c42649966677973490a510055c4 git
  • affected eda7acddf8080bb2d022a8d4b8b2345eb80c63ec to before dc1d8d3eb345c616fbe922a010fa391c72c54d52 git
  • affected eda7acddf8080bb2d022a8d4b8b2345eb80c63ec to before 099bfcbd0c16ae9b50aba2a1bea033e63f895da7 git
  • affected eda7acddf8080bb2d022a8d4b8b2345eb80c63ec to before a04dcc784959e4702048785d87e0d029bd2fbdcb git
  • affected eda7acddf8080bb2d022a8d4b8b2345eb80c63ec to before 6bab907292155513af397a12ccb488acbfc30d79 git
  • affected eda7acddf8080bb2d022a8d4b8b2345eb80c63ec to before b6ee361524641f57b2e2363f7737f20e17f67827 git
Other versions: unaffected
Linux Linux
  • affected 5.6
  • unaffected before 5.6 semver
  • unaffected 5.15.218 to 5.15.*, inclusive semver
  • unaffected 6.1.191 to 6.1.*, inclusive semver
  • unaffected 6.6.153 to 6.6.*, inclusive semver
  • unaffected 6.12.105 to 6.12.*, inclusive semver
  • unaffected 6.18.46 to 6.18.*, inclusive semver
  • unaffected 7.1.10 to 7.1.*, inclusive semver
  • unaffected 7.2 to *, inclusive original_commit_for_fix
Other versions: affected
Identifiers
CVE-2026-80587
CNA
Linux
Tags
Published
26 Aug 2026
Updated
30 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (Linux)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 44th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 26 Aug 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.