CVE-2024-38600

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.

Gravité et risque d'exploitation

CVE-2024-38600 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.19 %, ce qui la place devant 8.5 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <6b55e879e7bd023a03888fc6c8339edf82f576f4, 6.10, 0, <c2fb439f4f1425a961d20bec818fed2c2d9ef70a, <5.14, e94fdbd7b25d87e64688bb109e2c550217a4c879, <=6.6.*, 5.14, 6.8.12, <ff80185e7b7b547a0911fcfc8aefc61c3e8304d7, <=6.9.*, 6.6.33, 5.15.161, <=6.8.*, 6.1.93, <=*, <=5.15.*, <2f103287ef7960854808930499d1181bd0145d68, <87988a534d8e12f2e6fc01fe63e6c1925dc5307c, 6.9.3, <88ce3fe255d58a93624b467af036dc3519f309c7) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/ff80185e7b7b547a0911fcfc8aefc61c3e8304d7
• https://git.kernel.org/stable/c/c2fb439f4f1425a961d20bec818fed2c2d9ef70a
• https://git.kernel.org/stable/c/2f103287ef7960854808930499d1181bd0145d68
• https://git.kernel.org/stable/c/88ce3fe255d58a93624b467af036dc3519f309c7
• https://git.kernel.org/stable/c/6b55e879e7bd023a03888fc6c8339edf82f576f4
• https://git.kernel.org/stable/c/87988a534d8e12f2e6fc01fe63e6c1925dc5307c