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Change History

In the Linux kernel, the following vulnerability has been resolved:

can: raw: fix ro->uniq use-after-free in raw_rcv()

raw_release() unregisters raw CAN receive filters via can_rx_unregister(),
but receiver deletion is deferred with call_rcu(). This leaves a window
where raw_rcv() may still be running in an RCU read-side critical section
after raw_release() frees ro->uniq, leading to a use-after-free of the
percpu uniq storage.

Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific
socket destructor. can_rx_unregister() takes an extra reference to the
socket and only drops it from the RCU callback, so freeing uniq from
sk_destruct ensures the percpu area is not released until the relevant
callbacks have drained.

[mkl: applied manually]

https://git.kernel.org/stable/c/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0

https://git.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3a

https://git.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358e

https://git.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffa