# netfilter: nf_conntrack_expect: use conntrack GC to reap expectations

CVE record · `CVE-2026-80668`

- **Identifiers:** `CVE-2026-80668`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 Aug 2026
- **Updated:** 6 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 Aug 2026, 06:49 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `9e1196d27ef496f404c76f7a9d03761142d991c4 to before 61ca26e1a45965590f7e477c4d6f711162642e1c` (git)
  - affected: `5e1c1d22268ae710c238342c8030c21daf298168 to before 3d7b808ec35291ee75dcdb2b6fe5f587bfe9b1df` (git)
  - affected: `d52fa1fa7440676b8c238037a050ab008c22737f to before 02f7809a19fc88cfd9bc113a4bfe7add6305db39` (git)
  - affected: `f338ced0473849c9f6ed0b77ca99f1aab5826787 to before bc6b1da681abe631ed21b7fdced48546189d64a4` (git)
  - affected: `bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5 to before 7ec786f4230c2a9b2eaf97a2d45368933b49d2b2` (git)
  - affected: `bffcaad9afdfe45d7fc777397d3b83c1e3ebffe5 to before b8b09dc2bf35a00d4e0556b5d6308c7b917ebda2` (git)
  - affected: `497f99b26fffdc5635706d1b4811f1ed8ee21a5b` (git)
  - affected: `6.1.176 to before 6.1.191` (semver)
  - affected: `6.6.143 to before 6.6.160` (semver)
  - affected: `6.12.94 to before 6.12.114` (semver)
  - affected: `6.18.24 to before 6.18.61` (semver)
  - affected: `6.19.14 to before 6.20` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `7.0`
  - unaffected: `before 7.0` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.61 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.5 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0060, the 49th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 28 Aug 2026, 06:49 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-80668)
- 28 Aug 2026, 08:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-80668)

## Sources

- [CVE List: CVE-2026-80668](https://www.cve.org/CVERecord?id=CVE-2026-80668)
- [NVD: CVE-2026-80668](https://nvd.nist.gov/vuln/detail/CVE-2026-80668)

### References from the CNA

- <https://git.kernel.org/stable/c/61ca26e1a45965590f7e477c4d6f711162642e1c>
- <https://git.kernel.org/stable/c/3d7b808ec35291ee75dcdb2b6fe5f587bfe9b1df>
- <https://git.kernel.org/stable/c/02f7809a19fc88cfd9bc113a4bfe7add6305db39>
- <https://git.kernel.org/stable/c/bc6b1da681abe631ed21b7fdced48546189d64a4>
- <https://git.kernel.org/stable/c/7ec786f4230c2a9b2eaf97a2d45368933b49d2b2>
- <https://git.kernel.org/stable/c/b8b09dc2bf35a00d4e0556b5d6308c7b917ebda2>

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-2026-80668>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80668/>. Everything for agents: <https://agentprime.io/llms.txt>.