CVE-2026-23066
HighCVSS 7.8Summary
W jądrze systemu Linux naprawiono podatność związaną z funkcją rxrpc_recvmsg(). Problem polegał na niekontrolowanym ponownym umieszczaniu wywołań w kolejce, co mogło prowadzić do uszkodzenia kolejki recvmsg i potencjalnych błędów, takich jak UAF czy niedobory liczników odniesień.
Risk Assessment
Organizacje mogą być narażone na poważne problemy z bezpieczeństwem, w tym na możliwość wykorzystania luk w pamięci, co może prowadzić do nieautoryzowanego dostępu lub awarii systemu.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, aby usunąć tę podatność oraz monitorowanie systemów pod kątem potencjalnych exploitów związanych z tą luką.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at the front of the recvmsg queue already has its mutex locked, it requeues the call - whether or not the call is already queued. The call may be on the queue because MSG_PEEK was also passed and so the call was not dequeued or because the I/O thread requeued it. The unconditional requeue may then corrupt the recvmsg queue, leading to things like UAFs or refcount underruns. Fix this by only requeuing the call if it isn't already on the queue - and moving it to the front if it is already queued. If we don't queue it, we have to put the ref we obtained by dequeuing it. Also, MSG_PEEK doesn't dequeue the call so shouldn't call rxrpc_notify_socket() for the call if we didn't use up all the data on the queue, so fix that also.

