# ceph: lock mutex in ceph_mds_check_access()

CVE record · `CVE-2026-89990`

- **Identifiers:** `CVE-2026-89990`
- **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:** 16 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:33 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: `596afb0b8933ba6ed7227adcc538db26feb25c74 to before 729c1ff670ece6f3d4b1738365a0b2f90d487523` (git)
  - affected: `596afb0b8933ba6ed7227adcc538db26feb25c74 to before ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3` (git)
  - affected: `596afb0b8933ba6ed7227adcc538db26feb25c74 to before df1a97d5313fccadb08390306d49b194fb027392` (git)
  - affected: `596afb0b8933ba6ed7227adcc538db26feb25c74 to before a61c6ae1dae2611082b831b4aaa780878099c012` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.10`
  - unaffected: `before 6.10` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 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:** 0.0061, the 49th percentile, on 13 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

- [CVE List: CVE-2026-89990](https://www.cve.org/CVERecord?id=CVE-2026-89990)
- [NVD: CVE-2026-89990](https://nvd.nist.gov/vuln/detail/CVE-2026-89990)

### References from the CNA

- <https://git.kernel.org/stable/c/729c1ff670ece6f3d4b1738365a0b2f90d487523>
- <https://git.kernel.org/stable/c/ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3>
- <https://git.kernel.org/stable/c/df1a97d5313fccadb08390306d49b194fb027392>
- <https://git.kernel.org/stable/c/a61c6ae1dae2611082b831b4aaa780878099c012>

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-2026-89990>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89990/>. Everything for agents: <https://agentprime.io/llms.txt>.