# mptcp: prevent race between disconnect() and rtx

CVE record · `CVE-2026-97567`

- **Identifiers:** `CVE-2026-97567`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:21 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: `b29fcfb54cd70caca5b11c80d8d238854938884a to before 1a68a88369c0ab6309bd17f7e408290c5cb80dcf` (git)
  - affected: `b29fcfb54cd70caca5b11c80d8d238854938884a to before 75b3b30ae4ee6aa0572595f6b48544ed4f479eb6` (git)
  - affected: `b29fcfb54cd70caca5b11c80d8d238854938884a to before 2261f857ef4e0d21eb1a8b47b06640cf7ab16d3e` (git)
  - affected: `b29fcfb54cd70caca5b11c80d8d238854938884a to before 374da2b9be1280695ce41f108334a8f16e3e54be` (git)
  - affected: `b29fcfb54cd70caca5b11c80d8d238854938884a to before 69a7b2a912672159dda7dcf325d27752d448dfdf` (git)
  - affected: `b29fcfb54cd70caca5b11c80d8d238854938884a to before 85c580b0d8590520ae00a15c29e9fb9c99427a3e` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.17`
  - unaffected: `before 5.17` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.113 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

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Linux kernel MPTCP (Multipath TCP) is affected in versions from commit b29fcfb54cd70caca5b11c80d8d238854938884a before the listed fixes, and in version 5.17 in general. The source gives few details: it describes a race between disconnect() and retransmission handling that can lead to inconsistent status, but does not state the attacker position or the impact. No specific workaround is listed; upgrade to a fixed kernel version from the stable branch for your release line (6.1.191, 6.6.160, 6.12.113, or 6.18.53 or later).

Written 12 Nov 2026.

## 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:** 0.0021, the 11th 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-2026-97567](https://www.cve.org/CVERecord?id=CVE-2026-97567)
- [NVD: CVE-2026-97567](https://nvd.nist.gov/vuln/detail/CVE-2026-97567)

### References from the CNA

- <https://git.kernel.org/stable/c/1a68a88369c0ab6309bd17f7e408290c5cb80dcf>
- <https://git.kernel.org/stable/c/75b3b30ae4ee6aa0572595f6b48544ed4f479eb6>
- <https://git.kernel.org/stable/c/2261f857ef4e0d21eb1a8b47b06640cf7ab16d3e>
- <https://git.kernel.org/stable/c/374da2b9be1280695ce41f108334a8f16e3e54be>
- <https://git.kernel.org/stable/c/69a7b2a912672159dda7dcf325d27752d448dfdf>
- <https://git.kernel.org/stable/c/85c580b0d8590520ae00a15c29e9fb9c99427a3e>

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-2026-97567>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-97567/>. Everything for agents: <https://agentprime.io/llms.txt>.