CVE-2026-31532 - can: raw: fix ro->uniq use-after-free in raw_rcv()

CVE-2026-31532 - can: raw: fix ro->uniq use-after-free in raw_rcv()

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/23/2026 - 14:20
CVE ID :CVE-2026-31532
Published : April 23, 2026, 11:12 a.m. | 1 hour ago
Description :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]
Severity: 0.0 | NA
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