CVE-2025-40139

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

Description The Linux kernel contains a flaw within the smc module. The smc clc prfx set() function is called during the connect process without proper read-copy update (RCU) or routing table lock (RTNL) protection. This can lead to a use-after-free condition when accessing the socket’s destination device using sk dst get(sk)->dev. The issue is addressed by utilizing sk dst get() and dst dev rcu() under rcu read lock() after kernel getsockname(). The return value of smc clc prfx set() is not utilized by the calling function.

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