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CVE record · CVE-2026-89554

mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction

CVSS 8.2 HighEPSS 0.0060 · 49th percentile

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:44 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 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before 4534e0eead692bb069ad1e6a5a245fc2e2078300 git
  • affected 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before 63cacb05e51a1c6e1349d2e593d00fd6ef43def4 git
  • affected 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before 954b5ea836eb118d188975ced803448537ab8479 git
  • affected 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before 9df36a4846375a9b75bf42d77bfed216b0f366f9 git
  • affected 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before 64f2c5dd49b956a542c8c02b8dad5d262a462bba git
  • affected 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before 51887ccd88791ddaa8755a7c614fda031ecf7982 git
  • affected 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before bf19d166337c6488b39cb03eeeffb30a941d6326 git
  • affected 9466a1ccebbe54ac57fb8a89c2b4b854826546a8 to before b878dfdd12d7a5b8722a78d35e313506140ca3d9 git
Other versions: unaffected
Linux Linux
  • affected 5.9
  • unaffected before 5.9 semver
  • unaffected 5.10.270 to 5.10.*, inclusive semver
  • unaffected 5.15.221 to 5.15.*, inclusive semver
  • unaffected 6.1.188 to 6.1.*, inclusive semver
  • unaffected 6.6.157 to 6.6.*, inclusive semver
  • unaffected 6.12.109 to 6.12.*, inclusive semver
  • unaffected 6.18.50 to 6.18.*, inclusive semver
  • unaffected 7.2.4 to 7.2.*, inclusive semver
  • unaffected 7.3 to *, inclusive original_commit_for_fix
Other versions: affected
Identifiers
CVE-2026-89554
CNA
Linux
Tags
Published
11 Sept 2026
Updated
19 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
8.2 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H CNA (Linux)
  • CISA KEV Not listed.
  • EPSS 0.0060, the 49th percentile, on 14 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 11 Sept 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.