{"cve":"CVE-2026-80618","nvd":{"published":"2026-08-28T08:16:45.823","modified":"2026-08-28T08:16:45.823","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free\n\namdgpu_amdkfd_gpuvm_free_memory_of_gpu() unpinned DOORBELL and MMIO\nremap BOs (which are pinned at allocation time) before checking whether\nthe BO is still mapped to the GPU. When the BO is still mapped, the\nfunction returns -EBUSY and leaves the BO alive, but it has already\nbeen unpinned. The BO is then unpinned again when it is finally freed\nduring process teardown, triggering a ttm_bo_unpin() underflow warning:\n\n  WARNING: CPU: 18 PID: 15066 at ttm/ttm_bo.c:650 amdttm_bo_unpin+0x6d/0x80 [amdttm]\n  Workqueue: kfd_process_wq kfd_process_wq_release [amdgpu]\n  RIP: 0010:amdttm_bo_unpin+0x6d/0x80 [amdttm]\n  Call Trace:\n   amdgpu_bo_unpin+0x1a/0x90 [amdgpu]\n   amdgpu_amdkfd_gpuvm_unpin_bo+0x31/0xb0 [amdgpu]\n   amdgpu_amdkfd_gpuvm_free_memory_of_gpu+0x3bf/0x460 [amdgpu]\n   kfd_process_free_outstanding_kfd_bos+0xd4/0x170 [amdgpu]\n   kfd_process_wq_release+0x109/0x1b0 [amdgpu]\n   process_one_work+0x1e2/0x3b0\n   worker_thread+0x50/0x3a0\n   kthread+0xdd/0x100\n   ret_from_fork+0x29/0x50\n\nMove the unpin after the mapped_to_gpu_memory check so it only happens\nonce we are committed to freeing the BO.\n\n(cherry picked from commit 927c5b2defb9b09856444d94bebfd056a002bd75)","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/0e27d92f69b8e4c750a4b181cc05a86b9338c4f5","https://git.kernel.org/stable/c/1d12ae8b079e173107abec0e5817332954c8e95f","https://git.kernel.org/stable/c/283e77af49fda96aaa57709fc5408b55ffec075e","https://git.kernel.org/stable/c/3f0cc1735273a57c5116710cf0202e12152f59cc","https://git.kernel.org/stable/c/461ae406ae12107ebb321cabe561434c27aaea58"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-80618","score":0.00215,"percentile":0.11846,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}