CVE-2024-36969

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix division by zero in setup_dsc_config When slice_height is 0, the division by slice_height in the calculation of the number of slices will cause a division by zero driver crash. This leaves the kernel in a state that requires a reboot. This patch adds a check to avoid the division by zero. The stack trace below is for the 6.8.4 Kernel. I reproduced the issue on a Z16 Gen 2 Lenovo Thinkpad with a Apple Studio Display monitor connected via Thunderbolt. The amdgpu driver crashed with this exception when I rebooted the system with the monitor connected. kernel: ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) kernel: ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu kernel: ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu kernel: ? exc_divide_error (arch/x86/kernel/traps.c:194 (discriminator 2)) kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu kernel: ? asm_exc_divide_error (./arch/x86/include/asm/idtentry.h:548) kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu kernel: dc_dsc_compute_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1109) amdgpu After applying this patch, the driver no longer crashes when the monitor is connected and the system is rebooted. I believe this is the same issue reported for 3113.

Gravité et risque d'exploitation

CVE-2024-36969 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 0.21 %, ce qui la place devant 10.9 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, 6.10, <91402e0e5de9124a3108db7a14163fcf9a6d322f, 5.15.160, 0, 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c, <a32c8f951c8a456c1c251e1dcdf21787f8066445, <=6.6.*, <=6.9.*, <7e4f50dfc98c49b3dc6875a35c3112522fb25639, <130afc8a886183a94cf6eab7d24f300014ff87ba, 6.8.11, <=6.8.*, <f187fcbbb8f8bf10c6687f0beae22509369f7563, <=*, <=5.15.*, <308de6be0c9c7ba36915c0d398e771725c0ea911, 6.9.2, <4.15, 6.1.92, 6.6.32, 4.15) 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/a32c8f951c8a456c1c251e1dcdf21787f8066445
• https://git.kernel.org/stable/c/91402e0e5de9124a3108db7a14163fcf9a6d322f
• https://git.kernel.org/stable/c/7e4f50dfc98c49b3dc6875a35c3112522fb25639
• https://git.kernel.org/stable/c/f187fcbbb8f8bf10c6687f0beae22509369f7563
• https://git.kernel.org/stable/c/308de6be0c9c7ba36915c0d398e771725c0ea911
• https://git.kernel.org/stable/c/130afc8a886183a94cf6eab7d24f300014ff87ba