CVE-2026-46311 (GCVE-0-2026-46311)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:50 – Updated: 2026-10-19 19:36
VLAI
Title
drm/amdgpu/userq: fix access to stale wptr mapping
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/userq: fix access to stale wptr mapping Use drm_exec to take both locks i.e vm root bo and wptr_obj bo to access the mapping data properly. This fixes the security issue of unmap the wptr_obj while a queue creation is in progress and passing other bo at same address. (cherry picked from commit 1fc6c8ab45dbee096469c08c13f6099d57a52d6c)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:21 UTC
CWE
  • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5fb2f7fc21a3668e5794cc0d153641b9719713e1 , < 2da62dbb4169e758c0b1a9378b39a373bf4fb111 (git)
Affected: 5fb2f7fc21a3668e5794cc0d153641b9719713e1 , < 336a9186f3a4b65bbd865d93936605ac8a1a3991 (git)
Affected: 5fb2f7fc21a3668e5794cc0d153641b9719713e1 , < 6da7b1242da4455b11c24ce667d1cab1a348c8ea (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.0.9 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                "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": "2026-10-15T10:07:29.121Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2da62dbb4169e758c0b1a9378b39a373bf4fb111"
            },
            {
              "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": "2026-10-19T19:36:57.524Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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