CVE-2023-52921 (GCVE-0-2023-52921)

Vulnerability from cvelistv5 – Published: 2024-11-19 01:26 – Updated: 2026-08-05 09:12
VLAI
Title
drm/amdgpu: fix possible UAF in amdgpu_cs_pass1()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix possible UAF in amdgpu_cs_pass1() Since the gang_size check is outside of chunk parsing loop, we need to reset i before we free the chunk data. Suggested by Ye Zhang (@VAR10CK) of Baidu Security.
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 2024-12-11 14:25 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6642 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2ebf61f2cfb9a11bc17db30df3e675a4cd7418d3 , < e08e9dd09809b16f8f8cee8c466841b33d24ed96 (git)
Affected: 2ebf61f2cfb9a11bc17db30df3e675a4cd7418d3 , < 90e065677e0362a777b9db97ea21d43a39211399 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix possible UAF in amdgpu_cs_pass1()\n\nSince the gang_size check is outside of chunk parsing\nloop, we need to reset i before we free the chunk data.\n\nSuggested by Ye Zhang (@VAR10CK) of Baidu Security."
            }
          ],
          "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 vulnerable path is reached via the AMDGPU_CS DRM ioctl on a local render/primary node (/dev/dri/renderD*), not via network packet processing or adjacent-network protocols.\nAC:L - An attacker reliably triggers the bug by opening the render node, creating a context, and submitting a command submission with accepted non-IB chunks (e.g. DEPENDENCIES/SYNCOBJ_*) so gang_size stays 0; no race or attacker-uncontrollable condition is required.\nPR:L - AMDGPU_CS is registered with DRM_AUTH|DRM_RENDER_ALLOW, so any unprivileged local user who can open the render node (typical video/render group membership on desktops, GPU-capable apps, Steam Deck, etc.) can reach the bug without root or init-namespace capabilities.\nUI:N - The attacker issues the ioctls themselves; no separate victim action such as mounting a filesystem or opening a malicious file is required.\nS:U - Impact is confined to the host kernel privilege boundary (local privilege escalation / memory corruption in amdgpu); this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - The OOB kvfree of adjacent heap contents is an invalid/arbitrary free that enables classic UAF primitives after heap shaping, which per kernel CVSS guidance supports arbitrary memory disclosure.\nI:H - The same arbitrary-free/UAF primitive enables heap reuse and write primitives sufficient for control-flow hijacking or arbitrary kernel writes, so integrity impact is high.\nA:H - Freeing a garbage or live adjacent pointer readily causes kernel oops/panic or heap corruption crashes, so availability impact is high even without full exploitation."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:12:01.402Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/e08e9dd09809b16f8f8cee8c466841b33d24ed96"
            },
            {
              "url": "https://git.kernel.org/stable/c/90e065677e0362a777b9db97ea21d43a39211399"
            }
          ],
          "title": "drm/amdgpu: fix possible UAF in amdgpu_cs_pass1()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52921",
        "datePublished": "2024-11-19T01:26:30.495Z",
        "dateReserved": "2024-08-21T06:07:11.018Z",
        "dateUpdated": "2026-08-05T09:12:01.402Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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