# ceph: fix UAF in check_new_map() on session freed during unlock

CVE record · `CVE-2026-89654`

- **Identifiers:** `CVE-2026-89654`
- **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:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 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: `2f2dc053404febedc9c273452d9d518fb31fde72 to before 989343b7ee5b1a08778be0c7c4bf6030d3910807` (git)
  - affected: `2f2dc053404febedc9c273452d9d518fb31fde72 to before 352a278d5a1965aae3f817ce5d24a67ee42d45d1` (git)
  - affected: `2f2dc053404febedc9c273452d9d518fb31fde72 to before 820871e9dbeecd2533c4c5f5d91878ceaf02324c` (git)
  - affected: `2f2dc053404febedc9c273452d9d518fb31fde72 to before 9646dfee880730aae4b379a4b8ee6c88ac735acd` (git)
  - affected: `2f2dc053404febedc9c273452d9d518fb31fde72 to before 21d5be092d947f8d83f76f7ebf3989e7e9230a98` (git)
  - affected: `2f2dc053404febedc9c273452d9d518fb31fde72 to before ee611a7509554c4ca1f54f6aefe592fb1df7ea70` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.34`
  - unaffected: `before 2.6.34` (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: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 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:** 0.0064, 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89654](https://www.cve.org/CVERecord?id=CVE-2026-89654)
- [NVD: CVE-2026-89654](https://nvd.nist.gov/vuln/detail/CVE-2026-89654)

### References from the CNA

- <https://git.kernel.org/stable/c/989343b7ee5b1a08778be0c7c4bf6030d3910807>
- <https://git.kernel.org/stable/c/352a278d5a1965aae3f817ce5d24a67ee42d45d1>
- <https://git.kernel.org/stable/c/820871e9dbeecd2533c4c5f5d91878ceaf02324c>
- <https://git.kernel.org/stable/c/9646dfee880730aae4b379a4b8ee6c88ac735acd>
- <https://git.kernel.org/stable/c/21d5be092d947f8d83f76f7ebf3989e7e9230a98>
- <https://git.kernel.org/stable/c/ee611a7509554c4ca1f54f6aefe592fb1df7ea70>

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-2026-89654>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89654/>. Everything for agents: <https://agentprime.io/llms.txt>.