# ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode

CVE record · `CVE-2026-89653`

- **Identifiers:** `CVE-2026-89653`
- **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:** 19 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: `d517b3983dd3106ca92d6c5d0d09415a4a09481c to before 3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe` (git)
  - affected: `d517b3983dd3106ca92d6c5d0d09415a4a09481c to before 8c823bbab3c24e657469a84db96902ba82d4e8bb` (git)
  - affected: `d517b3983dd3106ca92d6c5d0d09415a4a09481c to before c4addccd05bacbef2144b4db14853d0308a218ac` (git)
  - affected: `d517b3983dd3106ca92d6c5d0d09415a4a09481c to before 736adee11af36e407ed902264f8b2fb5cf94b62f` (git)
  - affected: `d517b3983dd3106ca92d6c5d0d09415a4a09481c to before 4d298880f82c42383b36946bafde7ccf4d804c9b` (git)
  - affected: `d517b3983dd3106ca92d6c5d0d09415a4a09481c to before 96c3f5fbb0d5386e7111426f047f98cec4586674` (git)
  - affected: `d517b3983dd3106ca92d6c5d0d09415a4a09481c to before aedc9053d909508a5f56c3f49f885fc030df4730` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.15`
  - unaffected: `before 5.15` (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: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 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:** 0.0050, the 43rd 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-2026-89653](https://www.cve.org/CVERecord?id=CVE-2026-89653)
- [NVD: CVE-2026-89653](https://nvd.nist.gov/vuln/detail/CVE-2026-89653)

### References from the CNA

- <https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe>
- <https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb>
- <https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac>
- <https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f>
- <https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b>
- <https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674>
- <https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730>

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-2026-89653>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89653/>. Everything for agents: <https://agentprime.io/llms.txt>.