CVE-2026-53242

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams<br /> <br /> snd_pcm_drain() uses init_waitqueue_entry which does not clear<br /> entry.prev/next, and add_wait_queue with a conditional<br /> remove_wait_queue that is skipped when to_check is no longer<br /> in the group after concurrent UNLINK. The orphaned wait entry<br /> remains on the unlinked substream sleep queue. On the next<br /> drain iteration, add_wait_queue adds the entry to a new queue<br /> while still linked on the old one, corrupting both lists. A<br /> subsequent wake_up dereferences NULL at the func pointer<br /> (mapped from the spinlock at offset 0 of the misinterpreted<br /> wait_queue_head_t), causing a kernel panic.<br /> <br /> Replace init_waitqueue_entry/add_wait_queue/conditional<br /> remove_wait_queue with init_wait_entry/prepare_to_wait/<br /> finish_wait. init_wait_entry clears prev/next via<br /> INIT_LIST_HEAD on each iteration and sets<br /> autoremove_wake_function which auto-removes the entry on<br /> wake-up. finish_wait safely handles both the already-removed<br /> and still-queued cases.