Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: free sk if last When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(), and released at the end. If at that moment, it was the last reference being held, the sk would not be freed. sock_put() should then be called instead of __sock_put(). But that's not enough: if it is the last reference, sock_put() will call sk_free(), which will end up calling sk_stop_timer_sync() on the same timer, and waiting indefinitely to finish. So it is needed to mark that the timer is done at the end of the timer handler when it has not been rescheduled, not to call sk_stop_timer_sync() on "itself".

Affected versions

Linux: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before aa8cabde7e83bf96269ee47427dc9b59e3ed8e60 (git); 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before 1f26487e83e69462540bb1047139472957c913c6 (git); 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before 5da972efed3dc7599da6e2b5e8d906d1b7b1a728 (git); 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before 6a3af482188f6db4186d1605f64d911d7330abb3 (git); 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before 531c537b8fb620beabccfb1594e8d43cbebbb87a (git); 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before b74ad20198652b6b39a761c277ba65ae82b1e107 (git); 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before 8143a224785ceaf2b0856e08d4498916f38228fb (git); 00cfd77b9063dcdf3628a7087faba60de85a9cc8 through before b7b9a461569734d33d3259d58d2507adfac107ed (git); 5.10 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.