Detections
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CVE-2021-47294
medium
Description
In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.
References
https://git.kernel.org/stable/c/bc1660206c3723c37ed4d622ad81781f1e987250
https://git.kernel.org/stable/c/a01634bf91f2b6c42583770eb6815fb6d1e251cf
https://git.kernel.org/stable/c/9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950
https://git.kernel.org/stable/c/853262355518cd1247515b74e83fabf038aa6c29
https://git.kernel.org/stable/c/6811744bd0efb9e472cb15d066cdb460beb8cb8a
https://git.kernel.org/stable/c/517a16b1a88bdb6b530f48d5d153478b2552d9a8
https://git.kernel.org/stable/c/48866fd5c361ea417ed24b43fc2a7dc2f5b060ef
https://git.kernel.org/stable/c/25df44e90ff5959b5c24ad361b648504a7e39ef3