# sctp: reject stale cookies with mismatched verification tags

CVE record · `CVE-2026-80890`

- **Identifiers:** `CVE-2026-80890`
- **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, 17:11 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 f6e3cc296372accad4ee57405195021231ef4bcb` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c151daba0ceb1fb068a215b07de89fb1eb5f87bc` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 817cffdbdbdf50e1f2b016599d1897de3ca54964` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 61baa5020b0afb41bfd97f8f6ce5e336c4a4546e` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c68557a49e960dbcdede22c7a9b488603078b8b4` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a0d1693923f41d6f49083aa2446686aed09d1d79` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 35c279113498d19a8734e2aae67b951b9b20f634` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9d8da8e0a9bce4a340af60dd0446bc7eb8d07587` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.12`
  - unaffected: `before 2.6.12` (semver)
  - unaffected: `5.10.265 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.216 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.183 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.151 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.103 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.44 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.8 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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:** 0.0018, the 7th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 4 Sept 2026, 17:11 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-80890)
- 4 Sept 2026, 18:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-80890)

## Sources

- [CVE List: CVE-2026-80890](https://www.cve.org/CVERecord?id=CVE-2026-80890)
- [NVD: CVE-2026-80890](https://nvd.nist.gov/vuln/detail/CVE-2026-80890)

### References from the CNA

- <https://git.kernel.org/stable/c/f6e3cc296372accad4ee57405195021231ef4bcb>
- <https://git.kernel.org/stable/c/c151daba0ceb1fb068a215b07de89fb1eb5f87bc>
- <https://git.kernel.org/stable/c/817cffdbdbdf50e1f2b016599d1897de3ca54964>
- <https://git.kernel.org/stable/c/61baa5020b0afb41bfd97f8f6ce5e336c4a4546e>
- <https://git.kernel.org/stable/c/c68557a49e960dbcdede22c7a9b488603078b8b4>
- <https://git.kernel.org/stable/c/a0d1693923f41d6f49083aa2446686aed09d1d79>
- <https://git.kernel.org/stable/c/35c279113498d19a8734e2aae67b951b9b20f634>
- <https://git.kernel.org/stable/c/9d8da8e0a9bce4a340af60dd0446bc7eb8d07587>

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-2026-80890>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80890/>. Everything for agents: <https://agentprime.io/llms.txt>.