CVE-2026-74446

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: hold event_mutex while checkpointing CRIU events kfd_criu_checkpoint_events() counts the entries in p->event_idr via kfd_get_num_events(), allocates an array sized to that count, and then walks the same IDR to fill it. Neither the count nor the walk holds p->event_mutex. The CRIU checkpoint caller holds only p->mutex. Event create and destroy (kfd_event_create()/kfd_event_destroy()) take p->event_mutex and do not take p->mutex, so a second thread in the same process can insert or remove events between the count and the walk. If an event is inserted, the walk iterates more entries than were counted and writes past the end of the ev_privs allocation; if an event is removed, the walk dereferences an entry that is being freed. Hold p->event_mutex across the count and the walk so both observe a consistent view of p->event_idr. The lock is released before copy_to_user(), which only touches the local buffer. The caller already holds p->mutex and the create/destroy paths never take p->mutex, so the p->mutex -> p->event_mutex order is not inverted and no deadlock is introduced. (cherry picked from commit ff57e223ab105795b05d3ef3f3c35a5a441bcbaa)

Gravité et risque d'exploitation

CVE-2026-74446 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.3 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <6a52f48157fa7fb81e0c146937fd6c8b0c1cfdbd, <=6.1.*, <=6.12.*, 5.18, <8f7196f25b14f4290738639a50459b56a5ff2784, 0, <ff8bc5a68a9a70bdc38d61a72c7a49c56063f9d2, <bed80be08c0bee47fa242a4256ac873477c815f8, <=7.1.*, 6.12.103, <5.18, <=6.6.*, 6.1.183, <=6.18.*, <2040b7e39027cb83bb8c7b84a4c95c2f6053c32f, 40e8a766a761f7fdc8530347527b344fddf6f1a8, <=*, 7.1.8, 6.18.44, <9a7f765985f64fd4a7a58f7bc9cd80a1f4230628, 6.6.151, 7.2) 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/8f7196f25b14f4290738639a50459b56a5ff2784
• https://git.kernel.org/stable/c/2040b7e39027cb83bb8c7b84a4c95c2f6053c32f
• https://git.kernel.org/stable/c/9a7f765985f64fd4a7a58f7bc9cd80a1f4230628
• https://git.kernel.org/stable/c/6a52f48157fa7fb81e0c146937fd6c8b0c1cfdbd
• https://git.kernel.org/stable/c/bed80be08c0bee47fa242a4256ac873477c815f8
• https://git.kernel.org/stable/c/ff8bc5a68a9a70bdc38d61a72c7a49c56063f9d2