# xfrm: drop ESP-in-TCP packets with no ingress device

CVE record · `CVE-2026-80846`

- **Identifiers:** `CVE-2026-80846`
- **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:** 19 Oct 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: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 239d0f71af09dc2029fd4d730cb24b8c83aaa43a` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before f00235f9d12301183d61f75fbe4105506f3e5140` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 6af5cdb03819a5ce6e945992635c6c5e91045367` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 2dd1609cadff46c4b20ce53b91ab9cce1380456a` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before c296d25efbc840be24de83f56d43bc47e714ace9` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 328e40aa774b446969c69b654c52a051a95af8a1` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 7911e0236616487b89db6bd3ba3f408abd10eb23` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before 943d95233b8b4a88994e244fcf466f8c403d63f1` (git)
  - affected: `e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 to before e1d7c5ac1c246ce5775f604515de0a59fbf2116e` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (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:** 0.0019, the 9th percentile, on 14 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 4 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80846](https://www.cve.org/CVERecord?id=CVE-2026-80846)
- [NVD: CVE-2026-80846](https://nvd.nist.gov/vuln/detail/CVE-2026-80846)

### References from the CNA

- <https://git.kernel.org/stable/c/239d0f71af09dc2029fd4d730cb24b8c83aaa43a>
- <https://git.kernel.org/stable/c/f00235f9d12301183d61f75fbe4105506f3e5140>
- <https://git.kernel.org/stable/c/6af5cdb03819a5ce6e945992635c6c5e91045367>
- <https://git.kernel.org/stable/c/2dd1609cadff46c4b20ce53b91ab9cce1380456a>
- <https://git.kernel.org/stable/c/c296d25efbc840be24de83f56d43bc47e714ace9>
- <https://git.kernel.org/stable/c/328e40aa774b446969c69b654c52a051a95af8a1>
- <https://git.kernel.org/stable/c/7911e0236616487b89db6bd3ba3f408abd10eb23>
- <https://git.kernel.org/stable/c/943d95233b8b4a88994e244fcf466f8c403d63f1>
- <https://git.kernel.org/stable/c/e1d7c5ac1c246ce5775f604515de0a59fbf2116e>

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-2026-80846>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80846/>. Everything for agents: <https://agentprime.io/llms.txt>.