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CVE-2021-47294

In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch…

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 4.4.173 before 4.4.277
from 4.9.155 before 4.9.277
from 4.14.98 before 4.14.241
from 4.19.20 before 4.19.199
from 5.0 before 5.4.136
from 5.5 before 5.10.54

Weakness classification

CWE-672

References