# apparmor: fix out-of-bounds write when null terminating a label vec

CVE record · `CVE-2026-89761`

- **Identifiers:** `CVE-2026-89761`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **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, 19:47 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.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before 0d4cb3af82556afc48f90fd3e8a126ff32343f41` (git)
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before 40fdee1cb4f18e6a1a21a891ae4735bcd4d35026` (git)
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before 57bb24025f450728f342d8e08cd3909c89361d90` (git)
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before b17c8f5dcb36a032688847b2bce4bd813b4baad1` (git)
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before 9124e078ea2250d8d01d2162a550acb01ef5bf48` (git)
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before 28069434aef66b9d084f0609b7a29c171846815e` (git)
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before 36bdd0b45ec3f4822832a56e9db8674c8450dfce` (git)
  - affected: `f1bd904175e8190ce14aedee37e207ab51fe3b30 to before 9f1e40193eef7f047e6b77cfb4b4cafdecd7a123` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.13`
  - unaffected: `before 4.13` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0012, the 1st 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-2026-89761](https://www.cve.org/CVERecord?id=CVE-2026-89761)
- [NVD: CVE-2026-89761](https://nvd.nist.gov/vuln/detail/CVE-2026-89761)

### References from the CNA

- <https://git.kernel.org/stable/c/0d4cb3af82556afc48f90fd3e8a126ff32343f41>
- <https://git.kernel.org/stable/c/40fdee1cb4f18e6a1a21a891ae4735bcd4d35026>
- <https://git.kernel.org/stable/c/57bb24025f450728f342d8e08cd3909c89361d90>
- <https://git.kernel.org/stable/c/b17c8f5dcb36a032688847b2bce4bd813b4baad1>
- <https://git.kernel.org/stable/c/9124e078ea2250d8d01d2162a550acb01ef5bf48>
- <https://git.kernel.org/stable/c/28069434aef66b9d084f0609b7a29c171846815e>
- <https://git.kernel.org/stable/c/36bdd0b45ec3f4822832a56e9db8674c8450dfce>
- <https://git.kernel.org/stable/c/9f1e40193eef7f047e6b77cfb4b4cafdecd7a123>

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-2026-89761>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89761/>. Everything for agents: <https://agentprime.io/llms.txt>.