CVE-2026-46170
mptcp: pm: ADD_ADDR rtx: free sk if last
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Description
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/b74ad20198652b6b39a761c277ba65ae82b1e107
- https://git.kernel.org/stable/c/8143a224785ceaf2b0856e08d4498916f38228fb
- https://git.kernel.org/stable/c/b7b9a461569734d33d3259d58d2507adfac107ed
- https://git.kernel.org/stable/c/6a3af482188f6db4186d1605f64d911d7330abb3
- https://git.kernel.org/stable/c/531c537b8fb620beabccfb1594e8d43cbebbb87a
References (8)
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
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