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CVE record · CVE-2026-80557

libceph: fix OOB read in decode_watchers() via missing bounds check

CVSS 9.8 CriticalCriticalEPSS 0.0053 · 45th 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 a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before 85479b7d65b4ebcb07fbbe57230976793974ab4a git
  • affected a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before 1c824e7c75bb4adf19553dd4ea944a5d83096be8 git
  • affected a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before f161be39201eb5f9b1f58fb8f90b8a9cd3931eb6 git
  • affected a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before eab3eeb68bfc639d74f27256f05546af5c4f787d git
  • affected a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before c59219a6b62d74936963983e5815524c3de8dd79 git
  • affected a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before cb8246e5846dbbe34930903a90c7a90dd8e5910b git
  • affected a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before 7130d94846dadbb97b6b7f4d78a3a7bba6e3daa1 git
  • affected a4ed38d7a180f184a6e7aedd09db9ca4b1e6a71c to before 00ead17c7de137a692edee59f2772e6af687e8eb git
Other versions: unaffected
Linux Linux
  • affected 4.9
  • unaffected before 4.9 semver
  • unaffected 5.10.267 to 5.10.*, inclusive semver
  • unaffected 5.15.218 to 5.15.*, inclusive semver
  • unaffected 6.1.185 to 6.1.*, inclusive semver
  • unaffected 6.6.154 to 6.6.*, inclusive semver
  • unaffected 6.12.106 to 6.12.*, inclusive semver
  • unaffected 6.18.47 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-2026-80557
CNA
Linux
Tags
Published
26 Aug 2026
Updated
16 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 0.0053, the 45th 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.