CVE-2026-31766 (GCVE-0-2026-31766)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-08-05 12:25
VLAI
Title
drm/amdgpu: validate doorbell_offset in user queue creation
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: validate doorbell_offset in user queue creation amdgpu_userq_get_doorbell_index() passes the user-provided doorbell_offset to amdgpu_doorbell_index_on_bar() without bounds checking. An arbitrarily large doorbell_offset can cause the calculated doorbell index to fall outside the allocated doorbell BO, potentially corrupting kernel doorbell space. Validate that doorbell_offset falls within the doorbell BO before computing the BAR index, using u64 arithmetic to prevent overflow. (cherry picked from commit de1ef4ffd70e1d15f0bf584fd22b1f28cbd5e2ec)
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 , < 3543005a42d7e8e12b21897ef6798541bf7cbcd3 (git)
Affected: f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 , < 86b732fbc37ce4fb76cdd4af0fb7e30a6acdbce6 (git)
Affected: f09c1e6077abd1bc2ddd2b97e1135215801ca7f9 , < a018d1819f158991b7308e4f74609c6c029b670c (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c"
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    "dateReserved": "2026-03-09T15:48:24.140Z",
    "dateUpdated": "2026-08-05T12:25:00.359Z",
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-05T13:08:51+00:00",
      "cve": "CVE-2026-31766",
      "id": "CVE-2026-31766",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_not_affected": "260",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: drm/amdgpu: validate doorbell_offset in user queue creation",
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      "cve": "CVE-2026-31766",
      "id": "CVE-2026-31766",
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      "title": "SUSE CVE CVE-2026-31766",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.