# ipv6: fix fib6 walker UAF on seq stop

CVE record · `CVE-2026-97940`

- **Identifiers:** `CVE-2026-97940`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:22 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: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before 9a3f73d62c86271614eda4c43315230896a37018` (git)
  - affected: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before 63407cddabc5992b5ac03af165559f4a1968a032` (git)
  - affected: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before 05b687ee04f816658f4a9cf586f4d2f129157943` (git)
  - affected: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before 14fdaba201fdff92a3e45994e02bccda409cb19d` (git)
  - affected: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before 0eede1689610e9eeaf729ba86fd1321799eb91a0` (git)
  - affected: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before b89b691dd00bf39b9ba39ab9446f8c62f419fa7b` (git)
  - affected: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before 4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02` (git)
  - affected: `8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7 to before 19b4ed644d68098cc62ab612727f40d30f43476c` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.13`
  - unaffected: `before 3.13` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.7 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:** 0.0017, the 6th percentile, on 12 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 25 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-97940](https://www.cve.org/CVERecord?id=CVE-2026-97940)
- [NVD: CVE-2026-97940](https://nvd.nist.gov/vuln/detail/CVE-2026-97940)

### References from the CNA

- <https://git.kernel.org/stable/c/9a3f73d62c86271614eda4c43315230896a37018>
- <https://git.kernel.org/stable/c/63407cddabc5992b5ac03af165559f4a1968a032>
- <https://git.kernel.org/stable/c/05b687ee04f816658f4a9cf586f4d2f129157943>
- <https://git.kernel.org/stable/c/14fdaba201fdff92a3e45994e02bccda409cb19d>
- <https://git.kernel.org/stable/c/0eede1689610e9eeaf729ba86fd1321799eb91a0>
- <https://git.kernel.org/stable/c/b89b691dd00bf39b9ba39ab9446f8c62f419fa7b>
- <https://git.kernel.org/stable/c/4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02>
- <https://git.kernel.org/stable/c/19b4ed644d68098cc62ab612727f40d30f43476c>

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-2026-97940>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-97940/>. Everything for agents: <https://agentprime.io/llms.txt>.