CVE-2026-63843 (GCVE-0-2026-63843)
Vulnerability from cvelistv5
Published
2026-07-19 14:04
Modified
2026-08-05 12:36
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.5 ring JPEG rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit f05d0a4f21fc720116d6e238f23308b199891058)
References
Impacted products
Vendor Product Version
Linux Linux Version: 8f98a715da8e906cff5c635f9eb5399b84751557
Version: 8f98a715da8e906cff5c635f9eb5399b84751557
Version: 8f98a715da8e906cff5c635f9eb5399b84751557
Version: 8f98a715da8e906cff5c635f9eb5399b84751557
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/jpeg_v4_0_5.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "424510b60d4698a75a6ff71acdd88b528f0f39af",
              "status": "affected",
              "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
              "versionType": "git"
            },
            {
              "lessThan": "f26e3f7186cd6ecc93e6af102744d64c798dea7e",
              "status": "affected",
              "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
              "versionType": "git"
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            {
              "lessThan": "f9bc5633b761cff200c428f61ed0df6212b1c721",
              "status": "affected",
              "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
              "versionType": "git"
            },
            {
              "lessThan": "b65b7f3f3c18f797f81a2af7c97e2079900ad6db",
              "status": "affected",
              "version": "8f98a715da8e906cff5c635f9eb5399b84751557",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/jpeg_v4_0_5.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "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": "6.12.91",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.5 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit f05d0a4f21fc720116d6e238f23308b199891058)"
        }
      ],
      "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 - Exploitation requires submitting DRM_IOCTL_AMDGPU_CS on a local /dev/dri/renderD* device node; the vulnerable JPEG ring path is only reachable through this local ioctl interface, not over the network.\nAC:L - An attacker with render-node access can reliably craft an AMDGPU_CS submission with a FENCE chunk targeting the JPEG ring (ip_type=AMDGPU_HW_IP_VCN_JPEG) on VCN 4.0.5 hardware without races or conditions outside their control.\nPR:L - DRM_IOCTL_AMDGPU_CS is gated by DRM_AUTH|DRM_RENDER_ALLOW, requiring only unprivileged local access to a render node (typical for users in the render/video group, browser GPU processes, or cloud GPU tenants), not root in the init namespace.\nUI:N - No victim interaction is required once the attacker has render-node access; exploitation is achieved entirely through crafted ioctl submissions.\nS:U - Impact is confined to the kernel/GPU driver security domain of the compromised context; this is a standard local GPU driver memory-corruption issue, not a VM escape or cross-security-authority boundary bypass.\nC:H - The unsupported 64-bit user fence path causes the JPEG engine to perform a GPU-initiated memory write to attacker-chosen GPU virtual addresses, providing a memory-corruption primitive that can be leveraged for arbitrary kernel memory disclosure in exploit chains.\nI:H - The malformed fence write is a GPU-driven arbitrary memory write to attacker-controlled GPU VA mappings (including GTT-backed system memory), constituting a memory corruption primitive exploitable for code execution or privilege escalation.\nA:H - Triggering unsupported fence operations on the JPEG engine can cause GPU hangs, engine resets, or kernel warnings/oops, resulting in denial of service affecting system availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:36:20.909Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/424510b60d4698a75a6ff71acdd88b528f0f39af"
        },
        {
          "url": "https://git.kernel.org/stable/c/f26e3f7186cd6ecc93e6af102744d64c798dea7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9bc5633b761cff200c428f61ed0df6212b1c721"
        },
        {
          "url": "https://git.kernel.org/stable/c/b65b7f3f3c18f797f81a2af7c97e2079900ad6db"
        }
      ],
      "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.5 ring",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63843",
    "datePublished": "2026-07-19T14:04:37.815Z",
    "dateReserved": "2026-07-19T07:54:57.015Z",
    "dateUpdated": "2026-08-05T12:36:20.909Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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