CVE-2026-31532

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]