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CVE record · CVE-2026-89631

smb: client: reject a tree connect response whose byte count is too small

CVSS 9.1 CriticalCriticalEPSS 0.0049 · 42nd percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 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 cc20c031bb067eb3280a1c4b5c42295093e24863 to before bb99866cb1d3d5e8201200a8692fd8da3106a8fd git
  • affected cc20c031bb067eb3280a1c4b5c42295093e24863 to before d837645a719151ed392d4d9cab4571c2753dab12 git
  • affected cc20c031bb067eb3280a1c4b5c42295093e24863 to before 2ae219762ebac929bf6ab3473681f10ed566af08 git
  • affected cc20c031bb067eb3280a1c4b5c42295093e24863 to before 3be89e8039a85fa3b6cd5f9dcc4c1459eb356c2d git
  • affected cc20c031bb067eb3280a1c4b5c42295093e24863 to before 411e484fe71a7f1028de617447edad9cb6d9d68a git
  • affected cc20c031bb067eb3280a1c4b5c42295093e24863 to before 65deb18359341141d37dc86fc7853511be3c87a7 git
Other versions: unaffected
Linux Linux
  • affected 2.6.30
  • unaffected before 2.6.30 semver
  • unaffected 6.1.191 to 6.1.*, inclusive semver
  • unaffected 6.6.160 to 6.6.*, inclusive semver
  • unaffected 6.12.114 to 6.12.*, inclusive semver
  • unaffected 6.18.51 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-2026-89631
CNA
Linux
Tags
Published
11 Sept 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
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CNA (Linux)
  • CISA KEV Not listed.
  • EPSS 0.0049, the 42nd 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.