CVE-2026-80618

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free amdgpu_amdkfd_gpuvm_free_memory_of_gpu() unpinned DOORBELL and MMIO remap BOs (which are pinned at allocation time) before checking whether the BO is still mapped to the GPU. When the BO is still mapped, the function returns -EBUSY and leaves the BO alive, but it has already been unpinned. The BO is then unpinned again when it is finally freed during process teardown, triggering a ttm_bo_unpin() underflow warning: WARNING: CPU: 18 PID: 15066 at ttm/ttm_bo.c:650 amdttm_bo_unpin+0x6d/0x80 [amdttm] Workqueue: kfd_process_wq kfd_process_wq_release [amdgpu] RIP: 0010:amdttm_bo_unpin+0x6d/0x80 [amdttm] Call Trace: amdgpu_bo_unpin+0x1a/0x90 [amdgpu] amdgpu_amdkfd_gpuvm_unpin_bo+0x31/0xb0 [amdgpu] amdgpu_amdkfd_gpuvm_free_memory_of_gpu+0x3bf/0x460 [amdgpu] kfd_process_free_outstanding_kfd_bos+0xd4/0x170 [amdgpu] kfd_process_wq_release+0x109/0x1b0 [amdgpu] process_one_work+0x1e2/0x3b0 worker_thread+0x50/0x3a0 kthread+0xdd/0x100 ret_from_fork+0x29/0x50 Move the unpin after the mapped_to_gpu_memory check so it only happens once we are committed to freeing the BO. (cherry picked from commit 927c5b2defb9b09856444d94bebfd056a002bd75)

Gravité et risque d'exploitation

CVE-2026-80618 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 11.1 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <3f0cc1735273a57c5116710cf0202e12152f59cc, <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, 7.2, <283e77af49fda96aaa57709fc5408b55ffec075e, <c055a2088b719e9a4b580685e0ca97f9554a41a8, 0, <=7.1.*, <5.17, 6.1.178, <0e27d92f69b8e4c750a4b181cc05a86b9338c4f5, 6.12.97, <=6.6.*, <=6.18.*, <461ae406ae12107ebb321cabe561434c27aaea58, 6.6.145, d25e35bc26c3ca8cd728101545cfb3e86a5d7431, <=*, <1d12ae8b079e173107abec0e5817332954c8e95f, 5.17) 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/461ae406ae12107ebb321cabe561434c27aaea58
• https://git.kernel.org/stable/c/283e77af49fda96aaa57709fc5408b55ffec075e
• https://git.kernel.org/stable/c/c055a2088b719e9a4b580685e0ca97f9554a41a8
• https://git.kernel.org/stable/c/0e27d92f69b8e4c750a4b181cc05a86b9338c4f5
• https://git.kernel.org/stable/c/1d12ae8b079e173107abec0e5817332954c8e95f
• https://git.kernel.org/stable/c/3f0cc1735273a57c5116710cf0202e12152f59cc