CVE-2026-80618drm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free
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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)
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d25e35bc26c3ca8cd728101545cfb3e86a5d7431 before 461ae406ae12107ebb321cabe561434c27aaea58; from d25e35bc26c3ca8cd728101545cfb3e86a5d7431 before 283e77af49fda96aaa57709fc5408b55ffec075e; from d25e35bc26c3ca8cd728101545cfb3e86a5d7431 before c055a2088b719e9a4b580685e0ca97f9554a41a8; from d25e35bc26c3ca8cd728101545cfb3e86a5d7431 before 0e27d92f69b8e4c750a4b181cc05a86b9338c4f5; from d25e35bc26c3ca8cd728101545cfb3e86a5d7431 before 1d12ae8b079e173107abec0e5817332954c8e95f; from d25e35bc26c3ca8cd728101545cfb3e86a5d7431 before 3f0cc1735273a57c5116710cf0202e12152f59cc | CNA record |
References
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.