CVE - CVE-2024-38600

CVE-ID
CVE-2024-38600	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/2f103287ef7960854808930499d1181bd0145d68 URL:https://git.kernel.org/stable/c/2f103287ef7960854808930499d1181bd0145d68 MISC:https://git.kernel.org/stable/c/6b55e879e7bd023a03888fc6c8339edf82f576f4 URL:https://git.kernel.org/stable/c/6b55e879e7bd023a03888fc6c8339edf82f576f4 MISC:https://git.kernel.org/stable/c/87988a534d8e12f2e6fc01fe63e6c1925dc5307c URL:https://git.kernel.org/stable/c/87988a534d8e12f2e6fc01fe63e6c1925dc5307c MISC:https://git.kernel.org/stable/c/88ce3fe255d58a93624b467af036dc3519f309c7 URL:https://git.kernel.org/stable/c/88ce3fe255d58a93624b467af036dc3519f309c7 MISC:https://git.kernel.org/stable/c/c2fb439f4f1425a961d20bec818fed2c2d9ef70a URL:https://git.kernel.org/stable/c/c2fb439f4f1425a961d20bec818fed2c2d9ef70a MISC:https://git.kernel.org/stable/c/ff80185e7b7b547a0911fcfc8aefc61c3e8304d7 URL:https://git.kernel.org/stable/c/ff80185e7b7b547a0911fcfc8aefc61c3e8304d7
Assigning CNA
kernel.org
Date Record Created
20240618	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240618)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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