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CVE record · CVE-2026-89788

ksmbd: fix tree connection use-after-free in smb2_tree_connect()

CVSS 9.8 CriticalCriticalEPSS 0.0064 · 51st 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 16 Sept 2026, 08:48 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 7b58ee8d0b91359554cf219cd4f33872ea2afd66 to before 63f5939b50470ef4d245c16d2098376b952beb51 git
  • affected 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e to before ca3a3984bf445aaec69f6937f11e560d4b849365 git
  • affected 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e to before bd58a52738f7576ee5f5eb74243df13f902c8051 git
  • affected 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e to before 4e30fbd26e84efa2e5cbec4eb11e126ac0c79313 git
  • affected 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e to before b5ec6c462aab1062cf5d1e667ba7c6442f737055 git
  • affected dd45db4d9bbc8f122a9b4db5ce94ae29fcf03d3c git
  • affected 6.1.71 to before 6.1.191 semver
  • affected 5.15.145 to before 5.16 semver
Other versions: unaffected
Linux Linux
  • affected 6.6
  • unaffected before 6.6 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 7.2.6 to 7.2.*, inclusive semver
  • unaffected 7.3 to *, inclusive original_commit_for_fix
Other versions: affected
Identifiers
CVE-2026-89788
CNA
Linux
Tags
Published
16 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
9.8 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 0.0064, the 51st 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 16 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.