CVE-2026-97523

mptcp: close race between scheduler and state change

State: Published
Severity: 7.5 High
Published: Sep 25, 2026
Updated: Oct 19, 2026
Reserved: Sep 24, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b to before d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03Affected c886d70286bf3ad411eb3d689328a67f7102c6ae to before 5883ae880f51edc4b1484e787473b865b6159eadAffected c886d70286bf3ad411eb3d689328a67f7102c6ae to before 0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0Affected c886d70286bf3ad411eb3d689328a67f7102c6ae to before 8f11430d51ff8365bc51b670bc3002b65ae4c6b7Affected c886d70286bf3ad411eb3d689328a67f7102c6ae to before a09c87abf10a0a7e203137c75b5381aa63d9b31dAffected c886d70286bf3ad411eb3d689328a67f7102c6ae to before 4c856f3c151a2f3fa237caa651c44015916ca584Affected c886d70286bf3ad411eb3d689328a67f7102c6ae to before 42064de57fb83231fcc89663a94885f228a1ee53Affected 8caf5c15b5288d52d9c89374d6c10fa32ee84ec5Affected 5.15.190 to before 5.15.222Affected 5.19.4 to before 5.20Affected
LinuxLinux	6.0Affected before 6.0Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2.7 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b to before d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03Affected
c886d70286bf3ad411eb3d689328a67f7102c6ae to before 5883ae880f51edc4b1484e787473b865b6159eadAffected
c886d70286bf3ad411eb3d689328a67f7102c6ae to before 0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0Affected
c886d70286bf3ad411eb3d689328a67f7102c6ae to before 8f11430d51ff8365bc51b670bc3002b65ae4c6b7Affected
c886d70286bf3ad411eb3d689328a67f7102c6ae to before a09c87abf10a0a7e203137c75b5381aa63d9b31dAffected
c886d70286bf3ad411eb3d689328a67f7102c6ae to before 4c856f3c151a2f3fa237caa651c44015916ca584Affected
c886d70286bf3ad411eb3d689328a67f7102c6ae to before 42064de57fb83231fcc89663a94885f228a1ee53Affected
8caf5c15b5288d52d9c89374d6c10fa32ee84ec5Affected
5.15.190 to before 5.15.222Affected
5.19.4 to before 5.20Affected

LinuxLinux

6.0Affected
before 6.0Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2.7 through 7.2.*Not affected
7.3 and laterNot affected

References

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