Description
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.
CVSS breakdown
Affected products
- Linux / Linux9baee36e8c5443411c4629afabafaff8a46a23fd – cac5bf3500ee6422cf64e0df0b5daeecfed42917
- Linux / Linuxfc71f888994569f87d5bee20b1ac6c9c1e3a7a79 – d842f26a167e77a36f3ed333b9fa99d36ef99fe6
- Linux / Linux629cf09464cf98670996ea5c191dc9743e6f3f00 – d68b621bb5a48051932f1017a6e1bc9b18f854d0
- Linux / Linuxae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 – b053fcd8912f06c30f932f5b8ec41c72de474695
- Linux / Linux4a758e9a1f5ed722f83c4dd35f867fe811553bcb – cd98837db15f323463b8df07282ac723bd5c3fed
- Linux / Linux9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 – 7c71a9522555ff137a9ca36b15d759ca04d84788
- Linux / Linux9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 – 88fe2e3658726cb21ff2dcf9770bf672f9b9d31b
- Linux / Linuxc2f64e05a0587a83ec42dbd6b7a7ded79b2ff694 – c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694
- Linux / Linux5.10.253 – 5.10.259
- Linux / Linux6.1.167 – 6.1.176
- Linux / Linux6.6.130 – 6.6.143
- Linux / Linux6.12.78 – 6.12.94
- Linux / Linux6.18.19 – 6.18.36
- Linux / Linux6.19.9 – 6.20
- Linux / Linux7.0 – 7.0
- Linux / Linux0 – 7.0
- Linux / Linux5.10.259 – 5.10.*
- Linux / Linux6.1.176 – 6.1.*
- Linux / Linux6.6.143 – 6.6.*
- Linux / Linux6.12.94 – 6.12.*
- Linux / Linux6.18.36 – 6.18.*
- Linux / Linux7.0.13 – 7.0.*
- Linux / Linux7.1 – *
References
- MISChttps://git.kernel.org/stable/c/cac5bf3500ee6422cf64e0df0b5daeecfed42917
- MISChttps://git.kernel.org/stable/c/d842f26a167e77a36f3ed333b9fa99d36ef99fe6
- MISChttps://git.kernel.org/stable/c/d68b621bb5a48051932f1017a6e1bc9b18f854d0
- MISChttps://git.kernel.org/stable/c/b053fcd8912f06c30f932f5b8ec41c72de474695
- MISChttps://git.kernel.org/stable/c/cd98837db15f323463b8df07282ac723bd5c3fed
- MISChttps://git.kernel.org/stable/c/7c71a9522555ff137a9ca36b15d759ca04d84788
- MISChttps://git.kernel.org/stable/c/88fe2e3658726cb21ff2dcf9770bf672f9b9d31b