CVE-2024-43863

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Fix a deadlock in dma buf fence polling Introduce a version of the fence ops that on release doesn't remove the fence from the pending list, and thus doesn't require a lock to fix poll->fence wait->fence unref deadlocks. vmwgfx overwrites the wait callback to iterate over the list of all fences and update their status, to do that it holds a lock to prevent the list modifcations from other threads. The fence destroy callback both deletes the fence and removes it from the list of pending fences, for which it holds a lock. dma buf polling cb unrefs a fence after it's been signaled: so the poll calls the wait, which signals the fences, which are being destroyed. The destruction tries to acquire the lock on the pending fences list which it can never get because it's held by the wait from which it was called. Old bug, but not a lot of userspace apps were using dma-buf polling interfaces. Fix those, in particular this fixes KDE stalls/deadlock.

Gravité et risque d'exploitation

CVE-2024-43863 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 0.17 %, ce qui la place devant 5.4 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <9e20d028d8d1deb1e7fed18f22ffc01669cf3237, <c98ab18b9f315ff977c2c65d7c71298ef98be8e3, 5.15.165, 0, <e58337100721f3cc0c7424a18730e4f39844934f, 2298e804e96eb3635c39519c8287befd92460303, <=5.10.*, <=6.6.*, 6.1.104, <a8943969f9ead2fd3044fc826140a21622ef830e, <3.18, <3b933b16c996af8adb6bc1b5748a63dfb41a82bc, 6.10.4, <9908dc0d2ef0e4aec8a242c098455729c0e2f017, 6.11, 6.6.45, <=*, <=5.15.*, <=6.10.*, 3.18, 5.10.238) 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/9908dc0d2ef0e4aec8a242c098455729c0e2f017
• https://git.kernel.org/stable/c/9e20d028d8d1deb1e7fed18f22ffc01669cf3237
• https://git.kernel.org/stable/c/3b933b16c996af8adb6bc1b5748a63dfb41a82bc
• https://git.kernel.org/stable/c/a8943969f9ead2fd3044fc826140a21622ef830e
• https://git.kernel.org/stable/c/c98ab18b9f315ff977c2c65d7c71298ef98be8e3
• https://git.kernel.org/stable/c/e58337100721f3cc0c7424a18730e4f39844934f