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CVE record · CVE-2026-89778

isofs: fix out-of-bounds page array access on empty zisofs block

CVSS 9.8 CriticalCriticalEPSS 0.0070 · 53rd 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 59bc055211b8d266ab6089158058bf8268e02006 to before 8b994ac5778a725982fd6a8a3afcaa068d4a93e3 git
  • affected 59bc055211b8d266ab6089158058bf8268e02006 to before ad3249cdf9d4ba34bb8b1ff3956a4020fdfb5b0a git
  • affected 59bc055211b8d266ab6089158058bf8268e02006 to before 85904076cece72ee3194646ad7ac8e6659d999aa git
  • affected 59bc055211b8d266ab6089158058bf8268e02006 to before f03425dcbe04aec3c27b9917e97d7d23a2908dda git
  • affected 59bc055211b8d266ab6089158058bf8268e02006 to before cd616aa0449a772a6956abf03358f0ff31720580 git
  • affected 59bc055211b8d266ab6089158058bf8268e02006 to before 9c6eace8d07e90f038c89eb3b756d65a7e259d48 git
  • affected 59bc055211b8d266ab6089158058bf8268e02006 to before 68d4d3e78150c7ed7d1195af63ad1e6ace30c661 git
Other versions: unaffected
Linux Linux
  • affected 2.6.33
  • unaffected before 2.6.33 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 6.12.110 to 6.12.*, inclusive semver
  • unaffected 6.18.52 to 6.18.*, 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-2026-89778
CNA
Linux
Tags
Published
16 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
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 0.0070, the 53rd 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.