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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-80618

drm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free

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Status
Published
Published
Updated
Assigning organization
Linux

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)

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • d25e35bc26c3ca8cd728101545cfb3e86a5d7431 to < 461ae406ae12107ebb321cabe561434c27aaea58affected
  • d25e35bc26c3ca8cd728101545cfb3e86a5d7431 to < 283e77af49fda96aaa57709fc5408b55ffec075eaffected
  • d25e35bc26c3ca8cd728101545cfb3e86a5d7431 to < c055a2088b719e9a4b580685e0ca97f9554a41a8affected
  • d25e35bc26c3ca8cd728101545cfb3e86a5d7431 to < 0e27d92f69b8e4c750a4b181cc05a86b9338c4f5affected
  • d25e35bc26c3ca8cd728101545cfb3e86a5d7431 to < 1d12ae8b079e173107abec0e5817332954c8e95faffected
  • d25e35bc26c3ca8cd728101545cfb3e86a5d7431 to < 3f0cc1735273a57c5116710cf0202e12152f59ccaffected

Linux Linux

Default version status: affected

  • 5.17affected
  • 0 to < 5.17unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References