# libceph: fix multiple unsafe decodes in decode_locker()

CVE record · `CVE-2026-80561`

- **Identifiers:** `CVE-2026-80561`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 26 Aug 2026
- **Updated:** 16 Oct 2026
- **Reviewed by a person:** No

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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before 1ed45c8d96498725eb54f740172f9068d8673906` (git)
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before 6265103e78f0ee7e2518de9cf938b94bee9700a0` (git)
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before 3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070` (git)
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before fa4aa86fff0c56799c2e3f51a88879053285f4a9` (git)
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before dbfd83f722a78446ec18a476ef7a38e52240b50a` (git)
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before d1bba38574d095f191557d397d9633f08cd966b1` (git)
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before 51c8d238fe7236de627ab1a1433694552a904136` (git)
  - affected: `d4ed4a530562881cc5225050e42d96034f405aae to before 437b6551cfcc235eea1d735a874f9d421f555e17` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.9`
  - unaffected: `before 4.9` (semver)
  - unaffected: `5.10.266 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.217 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.184 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.153 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.105 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.46 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

## 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

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0051, the 44th 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

- [CVE List: CVE-2026-80561](https://www.cve.org/CVERecord?id=CVE-2026-80561)
- [NVD: CVE-2026-80561](https://nvd.nist.gov/vuln/detail/CVE-2026-80561)

### References from the CNA

- <https://git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906>
- <https://git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0>
- <https://git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070>
- <https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9>
- <https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a>
- <https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1>
- <https://git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136>
- <https://git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17>

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.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-80561>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80561/>. Everything for agents: <https://agentprime.io/llms.txt>.