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CVE-2026-63840 (GCVE-0-2026-63840)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36
VLAI
Title
drm/amdgpu/jpeg: set no_user_fence for JPEG v5.3.0 ring
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v5.3.0 ring JPEG rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 86ac011ae234c03fb872f4945913391ea1d8862e)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4aeaf3cbfa9f967e71849c66c6914ab6c2054581 , < 46ad73aec27d020f103b4262e4da2d2c22f54799 (git)
Affected: 4aeaf3cbfa9f967e71849c66c6914ab6c2054581 , < 3b0ea2021351b6b813b34fac940957f1f4fad85b (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/jpeg_v5_3_0.c"
          ],
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        }
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      "metrics": [
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          "cvssV3_1": {
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            "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": [
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              "lang": "en",
              "value": "AV:L - Exploitation requires submitting DRM_IOCTL_AMDGPU_CS on a local /dev/dri/renderD* device node; the vulnerable JPEG v5.3.0 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/JPEG 5.3.0 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": "2026-08-05T12:36:17.647Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/46ad73aec27d020f103b4262e4da2d2c22f54799"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b0ea2021351b6b813b34fac940957f1f4fad85b"
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      ],
      "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v5.3.0 ring",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63840",
    "datePublished": "2026-07-19T14:04:35.890Z",
    "dateReserved": "2026-07-19T07:54:57.015Z",
    "dateUpdated": "2026-08-05T12:36:17.647Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-04",
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      "percentile": "0.03119"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-31T19:13:17+00:00",
      "cve": "CVE-2026-63840",
      "id": "CVE-2026-63840",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu/jpeg: set no_user_fence for JPEG v5.3.0 ring",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63840.json",
      "version": "3"
    }
  }
}



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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.


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