drm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free
Summary
| CVE | CVE-2026-80618 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-28 08:16:45 UTC |
| Updated | 2026-08-28 08:16:45 UTC |
| 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) |
Risk And Classification
EPSS: 0.001720000 probability, percentile 0.067790000 (date 2026-08-30)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d25e35bc26c3ca8cd728101545cfb3e86a5d7431 461ae406ae12107ebb321cabe561434c27aaea58 git | Not specified |
| CNA | Linux | Linux | affected d25e35bc26c3ca8cd728101545cfb3e86a5d7431 283e77af49fda96aaa57709fc5408b55ffec075e git | Not specified |
| CNA | Linux | Linux | affected d25e35bc26c3ca8cd728101545cfb3e86a5d7431 c055a2088b719e9a4b580685e0ca97f9554a41a8 git | Not specified |
| CNA | Linux | Linux | affected d25e35bc26c3ca8cd728101545cfb3e86a5d7431 0e27d92f69b8e4c750a4b181cc05a86b9338c4f5 git | Not specified |
| CNA | Linux | Linux | affected d25e35bc26c3ca8cd728101545cfb3e86a5d7431 1d12ae8b079e173107abec0e5817332954c8e95f git | Not specified |
| CNA | Linux | Linux | affected d25e35bc26c3ca8cd728101545cfb3e86a5d7431 3f0cc1735273a57c5116710cf0202e12152f59cc git | Not specified |
| CNA | Linux | Linux | affected 5.17 | Not specified |
| CNA | Linux | Linux | unaffected 5.17 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.178 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.145 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.97 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.40 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.5 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/0e27d92f69b8e4c750a4b181cc05a86b9338c4f5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/1d12ae8b079e173107abec0e5817332954c8e95f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3f0cc1735273a57c5116710cf0202e12152f59cc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/283e77af49fda96aaa57709fc5408b55ffec075e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c055a2088b719e9a4b580685e0ca97f9554a41a8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/461ae406ae12107ebb321cabe561434c27aaea58 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.