CVE-2025-40257

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw in the mptcp pm del add timer() function, which can lead to a race condition. Specifically, the function may call sk stop timer sync() while another process is freeing memory associated with the timer, resulting in a slab-use-after-free issue. This condition was identified through reports from syzbot, a kernel testing tool. The issue occurs during the processing of incoming options within the mptcp protocol, potentially impacting network stability. The root cause is a lack of proper synchronization mechanisms, allowing concurrent access to the timer data structure.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.