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.
References7
- git.kernel.org/stable/c/0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0
- git.kernel.org/stable/c/42064de57fb83231fcc89663a94885f228a1ee53
- git.kernel.org/stable/c/4c856f3c151a2f3fa237caa651c44015916ca584
- git.kernel.org/stable/c/5883ae880f51edc4b1484e787473b865b6159ead
- git.kernel.org/stable/c/8f11430d51ff8365bc51b670bc3002b65ae4c6b7
- git.kernel.org/stable/c/a09c87abf10a0a7e203137c75b5381aa63d9b31d
- git.kernel.org/stable/c/d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 54 · as of 9 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.