# mptcp: close race between scheduler and state change

CVE record · `CVE-2026-97523`

- **Identifiers:** `CVE-2026-97523`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 19 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: `fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b to before d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03` (git)
  - affected: `c886d70286bf3ad411eb3d689328a67f7102c6ae to before 5883ae880f51edc4b1484e787473b865b6159ead` (git)
  - affected: `c886d70286bf3ad411eb3d689328a67f7102c6ae to before 0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0` (git)
  - affected: `c886d70286bf3ad411eb3d689328a67f7102c6ae to before 8f11430d51ff8365bc51b670bc3002b65ae4c6b7` (git)
  - affected: `c886d70286bf3ad411eb3d689328a67f7102c6ae to before a09c87abf10a0a7e203137c75b5381aa63d9b31d` (git)
  - affected: `c886d70286bf3ad411eb3d689328a67f7102c6ae to before 4c856f3c151a2f3fa237caa651c44015916ca584` (git)
  - affected: `c886d70286bf3ad411eb3d689328a67f7102c6ae to before 42064de57fb83231fcc89663a94885f228a1ee53` (git)
  - affected: `8caf5c15b5288d52d9c89374d6c10fa32ee84ec5` (git)
  - affected: `5.15.190 to before 5.15.222` (semver)
  - affected: `5.19.4 to before 5.20` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.0`
  - unaffected: `before 6.0` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 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

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0073, the 54th 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-2026-97523](https://www.cve.org/CVERecord?id=CVE-2026-97523)
- [NVD: CVE-2026-97523](https://nvd.nist.gov/vuln/detail/CVE-2026-97523)

### References from the CNA

- <https://git.kernel.org/stable/c/d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03>
- <https://git.kernel.org/stable/c/5883ae880f51edc4b1484e787473b865b6159ead>
- <https://git.kernel.org/stable/c/0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0>
- <https://git.kernel.org/stable/c/8f11430d51ff8365bc51b670bc3002b65ae4c6b7>
- <https://git.kernel.org/stable/c/a09c87abf10a0a7e203137c75b5381aa63d9b31d>
- <https://git.kernel.org/stable/c/4c856f3c151a2f3fa237caa651c44015916ca584>
- <https://git.kernel.org/stable/c/42064de57fb83231fcc89663a94885f228a1ee53>

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-2026-97523>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-97523/>. Everything for agents: <https://agentprime.io/llms.txt>.