# batman-adv: fix stale receive device on merged fragments

CVE record · `CVE-2026-89951`

- **Identifiers:** `CVE-2026-89951`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **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, 10:32 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: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before 63d86250fa7cbe22451369bd1c0881dfc8190958` (git)
  - affected: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before f830c2dfc1431764db9256b3d5db1695fc9a7f56` (git)
  - affected: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before f4b4ae763b5d59319fad62a00c76676758e7dafa` (git)
  - affected: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before 6df64825f8b199921120c685af2abca14b077331` (git)
  - affected: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before a2c272da99c2077088083c14961cf2f1e4506995` (git)
  - affected: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before e91d2cc7441d89a45bad73ad9789159c7441cb80` (git)
  - affected: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before 2dffc8c44b6e3347b3719c6419c07b4a18fea895` (git)
  - affected: `610bfc6bc99bc83680d190ebc69359a05fc7f605 to before ad46c907d7d9975a285c1e89a4adde652eaa93f5` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.13`
  - unaffected: `before 3.13` (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: `6.12.110 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0035, the 29th 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-2026-89951](https://www.cve.org/CVERecord?id=CVE-2026-89951)
- [NVD: CVE-2026-89951](https://nvd.nist.gov/vuln/detail/CVE-2026-89951)

### References from the CNA

- <https://git.kernel.org/stable/c/63d86250fa7cbe22451369bd1c0881dfc8190958>
- <https://git.kernel.org/stable/c/f830c2dfc1431764db9256b3d5db1695fc9a7f56>
- <https://git.kernel.org/stable/c/f4b4ae763b5d59319fad62a00c76676758e7dafa>
- <https://git.kernel.org/stable/c/6df64825f8b199921120c685af2abca14b077331>
- <https://git.kernel.org/stable/c/a2c272da99c2077088083c14961cf2f1e4506995>
- <https://git.kernel.org/stable/c/e91d2cc7441d89a45bad73ad9789159c7441cb80>
- <https://git.kernel.org/stable/c/2dffc8c44b6e3347b3719c6419c07b4a18fea895>
- <https://git.kernel.org/stable/c/ad46c907d7d9975a285c1e89a4adde652eaa93f5>

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-2026-89951>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89951/>. Everything for agents: <https://agentprime.io/llms.txt>.