# ceph: bound xattr value length in \_\_build_xattrs()

CVE record · `CVE-2026-89649`

- **Identifiers:** `CVE-2026-89649`
- **State:** Confirmed
- **Severity:** CVSS 9.1 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 9.1: 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: `355da1eb7a1f91c276b991764e951bbcd8047599 to before 848b80ca6b410f350d08b8ac19a00ef88223f2ea` (git)
  - affected: `355da1eb7a1f91c276b991764e951bbcd8047599 to before 01e3f19c301d492e12f16b3b463ac14d7cf3ebe7` (git)
  - affected: `355da1eb7a1f91c276b991764e951bbcd8047599 to before cb0cd79ae80476d1bc06bd9678484b6736f19588` (git)
  - affected: `355da1eb7a1f91c276b991764e951bbcd8047599 to before 61f085cb8976c9cebc90e1a8933e4cc1ad8b0fce` (git)
  - affected: `355da1eb7a1f91c276b991764e951bbcd8047599 to before 38be2f3c41ecaba58bb92dc16603e09ba9fd64f1` (git)
  - affected: `355da1eb7a1f91c276b991764e951bbcd8047599 to before 1dd356310b1660215f9a3626580bf8b363ef981e` (git)
  - affected: `355da1eb7a1f91c276b991764e951bbcd8047599 to before b12b3320c81fd72ab36388fb2445fec9c3038f10` (git)
  - affected: `355da1eb7a1f91c276b991764e951bbcd8047599 to before 68d541754d6cd3bb98d1fd8314f57e5eb533557d` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.34`
  - unaffected: `before 2.6.34` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0068, the 52nd 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-2026-89649](https://www.cve.org/CVERecord?id=CVE-2026-89649)
- [NVD: CVE-2026-89649](https://nvd.nist.gov/vuln/detail/CVE-2026-89649)

### References from the CNA

- <https://git.kernel.org/stable/c/848b80ca6b410f350d08b8ac19a00ef88223f2ea>
- <https://git.kernel.org/stable/c/01e3f19c301d492e12f16b3b463ac14d7cf3ebe7>
- <https://git.kernel.org/stable/c/cb0cd79ae80476d1bc06bd9678484b6736f19588>
- <https://git.kernel.org/stable/c/61f085cb8976c9cebc90e1a8933e4cc1ad8b0fce>
- <https://git.kernel.org/stable/c/38be2f3c41ecaba58bb92dc16603e09ba9fd64f1>
- <https://git.kernel.org/stable/c/1dd356310b1660215f9a3626580bf8b363ef981e>
- <https://git.kernel.org/stable/c/b12b3320c81fd72ab36388fb2445fec9c3038f10>
- <https://git.kernel.org/stable/c/68d541754d6cd3bb98d1fd8314f57e5eb533557d>

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-2026-89649>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89649/>. Everything for agents: <https://agentprime.io/llms.txt>.