CVE-2024-38600: In the Linux kernel, the following vulnerability has been resolved: ALSA: Fix deadlocks with kctl removals at disconnection In snd_card_disconnect(), we set…

PriorityP421medium5.5CVSS 3.1

AVLACLPRLUINSUCNINAH

EPSS

0.19%

9.3th percentile

In the Linux kernel, the following vulnerability has been resolved:

ALSA: Fix deadlocks with kctl removals at disconnection

In snd_card_disconnect(), we set card->shutdown flag at the beginning,
call callbacks and do sync for card->power_ref_sleep waiters at the
end. The callback may delete a kctl element, and this can lead to a
deadlock when the device was in the suspended state. Namely:

* A process waits for the power up at snd_power_ref_and_wait() in
snd_ctl_info() or read/write() inside card->controls_rwsem.

* The system gets disconnected meanwhile, and the driver tries to
delete a kctl via snd_ctl_remove*(); it tries to take
card->controls_rwsem again, but this is already locked by the
above. Since the sleeper isn't woken up, this deadlocks.

An easy fix is to wake up sleepers before processing the driver
disconnect callbacks but right after setting the card->shutdown flag.
Then all sleepers will abort immediately, and the code flows again.

So, basically this patch moves the wait_event() call at the right
timing. While we're at it, just to be sure, call wait_event_all()
instead of wait_event(), although we don't use exclusive events on
this queue for now.

Affected

19 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.94-1 (bookworm)	linux 6.1.94-1 (bookworm)
linux	linux	—	—
linux	linux	>= e94fdbd7b25d87e64688bb109e2c550217a4c879 < ff80185e7b7b547a0911fcfc8aefc61c3e8304d7	ff80185e7b7b547a0911fcfc8aefc61c3e8304d7
linux	linux	>= e94fdbd7b25d87e64688bb109e2c550217a4c879 < c2fb439f4f1425a961d20bec818fed2c2d9ef70a	c2fb439f4f1425a961d20bec818fed2c2d9ef70a
linux	linux	>= e94fdbd7b25d87e64688bb109e2c550217a4c879 < 2f103287ef7960854808930499d1181bd0145d68	2f103287ef7960854808930499d1181bd0145d68
linux	linux	>= e94fdbd7b25d87e64688bb109e2c550217a4c879 < 88ce3fe255d58a93624b467af036dc3519f309c7	88ce3fe255d58a93624b467af036dc3519f309c7
linux	linux	>= e94fdbd7b25d87e64688bb109e2c550217a4c879 < 6b55e879e7bd023a03888fc6c8339edf82f576f4	6b55e879e7bd023a03888fc6c8339edf82f576f4
linux	linux	>= e94fdbd7b25d87e64688bb109e2c550217a4c879 < 87988a534d8e12f2e6fc01fe63e6c1925dc5307c	87988a534d8e12f2e6fc01fe63e6c1925dc5307c
linux	linux_kernel	< 5.15.161	5.15.161
linux	linux_kernel	>= 0 < 6.1.94-1	6.1.94-1
linux	linux_kernel	>= 0 < 6.8.12-1	6.8.12-1
linux	linux_kernel	>= 0 < 6.8.12-1	6.8.12-1
linux	linux_kernel	>= 0 < 5.4.0-192.212	5.4.0-192.212
linux	linux_kernel	>= 0 < 5.15.0-118.128	5.15.0-118.128
linux	linux_kernel	>= 0 < 6.8.0-40.40	6.8.0-40.40
linux	linux_kernel	>= 5.16 < 6.1.93	6.1.93
linux	linux_kernel	>= 6.2 < 6.6.33	6.6.33
linux	linux_kernel	>= 6.7 < 6.8.12	6.8.12
linux	linux_kernel	>= 6.9 < 6.9.3	6.9.3

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv7.8HIGH

vendor_ubuntu7.8HIGH

vendor_debian5.5MEDIUM

vendor_redhat5.5MEDIUM

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