# xfrm: ah6: validate routing header segments_left

CVE record · `CVE-2026-80844`

- **Identifiers:** `CVE-2026-80844`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 4 Sept 2026
- **Updated:** 6 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 4 Sept 2026, 15:54 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: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2dc650956e4e163b879b3fb1027f9557abc5c985` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 48b0e36cf54358276ee7aa897034c973097d2bc9` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1b7e066eabcc7d6d8f476c34739b45932f2f4c31` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f00df8500e5a36ba70d336fd34bd2152ea074e5f` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1516e31ac458a738be485620579d8f7fb2700fcb` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6733ae71268a27d598cfb3f3339a3c950b9b656d` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0bf11081ad3753938a2b48723ce6298dbac743a1` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 46640c814f25f096b0b0045ca50e1b7030cd8a30` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 7bad4bda74dc4713f398d3b7624ff05478e3a568` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.12`
  - unaffected: `before 2.6.12` (semver)
  - unaffected: `5.10.269 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.220 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.187 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.156 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.108 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.49 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.13 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2.3 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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0043, the 38th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 4 Sept 2026, 15:54 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-80844)
- 4 Sept 2026, 16:18 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-80844)

## Sources

- [CVE List: CVE-2026-80844](https://www.cve.org/CVERecord?id=CVE-2026-80844)
- [NVD: CVE-2026-80844](https://nvd.nist.gov/vuln/detail/CVE-2026-80844)

### References from the CNA

- <https://git.kernel.org/stable/c/2dc650956e4e163b879b3fb1027f9557abc5c985>
- <https://git.kernel.org/stable/c/48b0e36cf54358276ee7aa897034c973097d2bc9>
- <https://git.kernel.org/stable/c/1b7e066eabcc7d6d8f476c34739b45932f2f4c31>
- <https://git.kernel.org/stable/c/f00df8500e5a36ba70d336fd34bd2152ea074e5f>
- <https://git.kernel.org/stable/c/1516e31ac458a738be485620579d8f7fb2700fcb>
- <https://git.kernel.org/stable/c/6733ae71268a27d598cfb3f3339a3c950b9b656d>
- <https://git.kernel.org/stable/c/0bf11081ad3753938a2b48723ce6298dbac743a1>
- <https://git.kernel.org/stable/c/46640c814f25f096b0b0045ca50e1b7030cd8a30>
- <https://git.kernel.org/stable/c/7bad4bda74dc4713f398d3b7624ff05478e3a568>

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-2026-80844>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80844/>. Everything for agents: <https://agentprime.io/llms.txt>.