CVE-2026-74454

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Supply the overflow slot size in BPOS, not the whole bin BO size vc4_overflow_mem_work() points BPOA at a 512KB slot inside the 16MB binner BO, but writes the size of the whole BO to BPOS. On every binner out-of-memory event the PTB is therefore authorized to write tile lists across all the other slots (which may hold the tile state, tile alloc and overflow memory of in-flight jobs) and, for any slot but the first, past the end of the binner BO into unrelated CMA memory. Since CMA pages are recycled into page cache and user allocations, this is arbitrary memory corruption by GPU DMA. In practice it shows up as GPU hangs with corrupted control list pointers, userspace heap corruption, a GPU that stays permanently wedged after the first hang, and occasional full system crashes, whenever a job overflows the initial binner slot. The bug dates back to the conversion from a dedicated overflow BO (where writing the full BO size was correct) to the slotted binner BO.

Gravité et risque d'exploitation

CVE-2026-74454 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 <=6.1.*, 7.2, <0badb30871004d34df87be33e853536f0b69885f, <=6.12.*, <6395789e4739aa5177bbec0fa0f07ccc38d249b0, 0, <=7.1.*, 6.12.103, <=6.6.*, 4.13, <6cd5acf6f87c073622bd61e38fe99c47365cda9c, <2f2291a119e9a8b696ae8bb36e86b75d272ceaea, 6.1.183, <=6.18.*, <4.13, <1e33ca7f44be64beed2735bb76b86eb65ba8c05b, <=*, 7.1.8, <bb5656ae063f2711f56438cf2f1f5b613aea5f12, 6.18.44, 6.6.151, 553c942f8b2cbc7394b4d4fa2f848b23a8f07451) 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/bb5656ae063f2711f56438cf2f1f5b613aea5f12
• https://git.kernel.org/stable/c/2f2291a119e9a8b696ae8bb36e86b75d272ceaea
• https://git.kernel.org/stable/c/0badb30871004d34df87be33e853536f0b69885f
• https://git.kernel.org/stable/c/6cd5acf6f87c073622bd61e38fe99c47365cda9c
• https://git.kernel.org/stable/c/1e33ca7f44be64beed2735bb76b86eb65ba8c05b
• https://git.kernel.org/stable/c/6395789e4739aa5177bbec0fa0f07ccc38d249b0