{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/mes_userqueue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "336a9186f3a4b65bbd865d93936605ac8a1a3991",
              "status": "affected",
              "version": "5fb2f7fc21a3668e5794cc0d153641b9719713e1",
              "versionType": "git"
            },
            {
              "lessThan": "6da7b1242da4455b11c24ce667d1cab1a348c8ea",
              "status": "affected",
              "version": "5fb2f7fc21a3668e5794cc0d153641b9719713e1",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/mes_userqueue.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.9",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/userq: fix access to stale wptr mapping\n\nUse drm_exec to take both locks i.e vm root bo and\nwptr_obj bo to access the mapping data properly.\n\nThis fixes the security issue of unmap the wptr_obj while\na queue creation is in progress and passing other\nbo at same address.\n\n(cherry picked from commit 1fc6c8ab45dbee096469c08c13f6099d57a52d6c)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through local DRM ioctls (DRM_IOCTL_AMDGPU_USERQ and DRM_IOCTL_AMDGPU_GEM_VA) on an AMDGPU render node (/dev/dri/renderD*), not via any network-facing path.\nAC:L - An attacker controls both sides of the race by running concurrent threads that issue USERQ_CREATE and GEM_VA UNMAP/REPLACE on the same wptr VA; amdgpu_vm_bo_unmap proceeds even when userq_va_mapped is set, making the window reliably triggerable.\nPR:L - Exploitation requires only access to the AMDGPU render node (DRM_AUTH|DRM_RENDER_ALLOW), which is available to unprivileged local users in the render/video group, not real root in the init namespace.\nUI:N - No victim interaction is required; the attacker automates the race with concurrent ioctl calls from their own process.\nS:U - The vulnerability corrupts kernel driver state and can lead to standard local kernel privilege escalation; it does not cross a VM, sandbox, or IOMMU security boundary.\nC:H - Operating on a stale BO pointer without holding locks can cause use-after-free and use attacker-replaced mappings, enabling arbitrary kernel memory disclosure through freed-object reuse and GART mapping confusion.\nI:H - The stale BO can be pinned and mapped into GART while a different BO occupies the VA, letting GPU firmware track wptr at the wrong physical address and enabling kernel heap corruption via UAF on amdgpu_bo structures.\nA:H - Use-after-free on BO reservation/pinning can kernel-oops the system, and incorrect wptr GART setup can hang or reset the GPU during queue scheduling."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:10.882Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/336a9186f3a4b65bbd865d93936605ac8a1a3991"
        },
        {
          "url": "https://git.kernel.org/stable/c/6da7b1242da4455b11c24ce667d1cab1a348c8ea"
        }
      ],
      "title": "drm/amdgpu/userq: fix access to stale wptr mapping",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46311",
    "datePublished": "2026-06-08T15:50:41.866Z",
    "dateReserved": "2026-05-13T15:03:33.111Z",
    "dateUpdated": "2026-08-05T12:31:10.882Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}