mptcp: close race between scheduler and state change (CVE-2026-97523) | HOL Guard CVE

High · CVSS 7.5CVE-2026-97523

mptcp: close race between scheduler and state change

Answer in brief

CVE-2026-97523 records a High severity (CVSS 7.5) vulnerability in mptcp: close race between scheduler and state change. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=c886d70286bf3ad411eb3d689328a67f7102c6ae <8f11430d51ff8365bc51b670bc3002b65ae4c6b7 \|\| >=c886d70286bf3ad411eb3d689328a67f7102c6ae <a09c87abf10a0a7e203137c75b5381aa63d9b31d \|\| >=c886d70286bf3ad411eb3d689328a67f7102c6ae <4c856f3c151a2f3fa237caa651c44015916ca584 \|\| >=c886d70286bf3ad411eb3d689328a67f7102c6ae <42064de57fb83231fcc89663a94885f228a1ee53 \|\| fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b \|\| 8caf5c15b5288d52d9c89374d6c10fa32ee84ec5 \|\| >=5.15.190 <5.16 \|\| >=5.19.4 <5.20	8f11430d51ff8365bc51b670bc3002b65ae4c6b7, a09c87abf10a0a7e203137c75b5381aa63d9b31d, 4c856f3c151a2f3fa237caa651c44015916ca584, 42064de57fb83231fcc89663a94885f228a1ee53, 5.16, 5.20
Linux/Linuxgeneric	6.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 8f11430d51ff8365bc51b670bc3002b65ae4c6b7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: mptcp: close race between scheduler and state change The mptcp scheduler may race with subflow sockets state change: data transmission on the selected socket may fail and a later release could try to use mss_now reset to 0 for a divide operation. Address the issue by explicitly checking for the critical scenario.

Quoted source text, attributed separately from HOL analysis.