CVE-2026-53242

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

• linux linux kernel (>= 5.10.253 < 5.10.259) • linux linux kernel (>= 6.1.167 < 6.1.176) • linux linux kernel (>= 6.6.130 < 6.6.143) • linux linux kernel (>= 6.12.78 < 6.12.94) • linux linux kernel (>= 6.18.19 < 6.18.36) • linux linux kernel (>= 6.19.9 < 7.0) • linux linux kernel (>= 7.0.1 < 7.0.13) • linux linux kernel 7.0 • linux linux kernel 7.1