CVE-2026-80618 (GCVE-0-2026-80618)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48
VLAI
Title
drm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free
Summary
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)
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d25e35bc26c3ca8cd728101545cfb3e86a5d7431 , < 461ae406ae12107ebb321cabe561434c27aaea58 (git)
Affected: d25e35bc26c3ca8cd728101545cfb3e86a5d7431 , < 283e77af49fda96aaa57709fc5408b55ffec075e (git)
Affected: d25e35bc26c3ca8cd728101545cfb3e86a5d7431 , < c055a2088b719e9a4b580685e0ca97f9554a41a8 (git)
Affected: d25e35bc26c3ca8cd728101545cfb3e86a5d7431 , < 0e27d92f69b8e4c750a4b181cc05a86b9338c4f5 (git)
Affected: d25e35bc26c3ca8cd728101545cfb3e86a5d7431 , < 1d12ae8b079e173107abec0e5817332954c8e95f (git)
Affected: d25e35bc26c3ca8cd728101545cfb3e86a5d7431 , < 3f0cc1735273a57c5116710cf0202e12152f59cc (git)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c"
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      "cpeApplicability": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:38.112Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/461ae406ae12107ebb321cabe561434c27aaea58"
        },
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          "url": "https://git.kernel.org/stable/c/283e77af49fda96aaa57709fc5408b55ffec075e"
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        },
        {
          "url": "https://git.kernel.org/stable/c/3f0cc1735273a57c5116710cf0202e12152f59cc"
        }
      ],
      "title": "drm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80618",
    "datePublished": "2026-08-28T06:48:38.112Z",
    "dateReserved": "2026-08-26T14:34:25.774Z",
    "dateUpdated": "2026-08-28T06:48:38.112Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80618",
      "date": "2026-09-01",
      "epss": "0.00172",
      "percentile": "0.06779"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T08:04:54+00:00",
      "cve": "CVE-2026-80618",
      "id": "CVE-2026-80618",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdkfd: Avoid double-unpin of DOORBELL/MMIO BOs on free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80618.json",
      "version": "3"
    }
  }
}



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