CVE-2026-63845 (GCVE-0-2026-63845)

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 v4.0 ring
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring JPEG rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 8d0cac9478a3f046279c657d6a2545de49ae675a)
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: b13111de32a9202c6d58bb7e4c06296b99c4d7e3 , < d4e0172a1b614373385e9b7111b580f8d2e0b98f (git)
Affected: b13111de32a9202c6d58bb7e4c06296b99c4d7e3 , < a676f16ea9a7df96d69f405afb6eb349571b3382 (git)
Affected: b13111de32a9202c6d58bb7e4c06296b99c4d7e3 , < 6876d05b899102f4dfdb9ad560132126144c1c72 (git)
Affected: b13111de32a9202c6d58bb7e4c06296b99c4d7e3 , < af4b458daa597dae707bf3f1f74745f5fc133ca2 (git)
Affected: b13111de32a9202c6d58bb7e4c06296b99c4d7e3 , < e7e90b5839aeb8805ec83bb4da610b8dab8e184d (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (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_v4_0.c"
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              "version": "6.12.91",
              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "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 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 8d0cac9478a3f046279c657d6a2545de49ae675a)"
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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",
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          },
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              "value": "AV:L - Exploitation requires a local DRM render-node client to issue DRM_IOCTL_AMDGPU_CS; the vulnerable path runs when amdgpu_cs_ioctl accepts a command submission with an AMDGPU_CHUNK_ID_FENCE user fence targeting the JPEG v4.0 decode ring (AMDGPU_HW_IP_VCN_JPEG).\nAC:L - An attacker with render-node access can deterministically submit a JPEG-ring CS with a user-fence chunk; no race or victim-dependent timing is required beyond having an affected VCN 4.0.0/4.0.2/4.0.4 AMD GPU (RDNA3-class hardware).\nPR:L - Only a local unprivileged user able to open /dev/dri/renderD* and submit CS jobs is needed; amdgpu_cs_ioctl is exposed to render clients (DRM_RENDER_ALLOW) without requiring root or DRM master privileges.\nUI:N - No victim interaction is required; the attacker directly crafts and submits the malicious ioctl from their own GPU client process.\nS:U - The corrupted GPU fence write is performed through the submitting context\u0027s GPU VM and does not cross a VM/host or IOMMU security boundary; impact remains within the attacker\u0027s kernel/GPU security scope (local privilege escalation scenario).\nC:H - amdgpu_ib.c always emits user fences with AMDGPU_FENCE_FLAG_64BIT, but jpeg_v2_0_dec_ring_emit_fence (used by JPEG v4.0) only supports 32-bit writes and WARN_ONs the 64-bit flag, causing the hardware to perform an unsupported GPU memory write that can corrupt memory and be leveraged for information disclosure.\nI:H - The unsupported fence path issues a GPU MEM_WR to an attacker-chosen GPU virtual address, providing a memory-corruption primitive that can be developed into arbitrary writes and potential kernel code execution.\nA:H - Submitting an unsupported 64-bit user fence to the JPEG ring can hang or reset the GPU and destabilize the amdgpu driver, causing denial of service to GPU workloads and potential system-wide availability impact."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e7e90b5839aeb8805ec83bb4da610b8dab8e184d"
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      "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring",
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    "datePublished": "2026-07-19T14:04:39.084Z",
    "dateReserved": "2026-07-19T07:54:57.016Z",
    "dateUpdated": "2026-08-05T12:36:23.065Z",
    "state": "PUBLISHED"
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        "lastModified": "2026-07-27T17:44:23.777",
        "metrics": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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      "current_release_date": "2026-08-21T16:48:18+00:00",
      "cve": "CVE-2026-63845",
      "id": "CVE-2026-63845",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63845.json",
      "version": "3"
    },
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      "current_release_date": "2026-09-18T00:47:42Z",
      "cve": "CVE-2026-63845",
      "id": "CVE-2026-63845",
      "initial_release_date": "2026-07-24T02:13:53Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "482",
      "product_status:known_not_affected": "229",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63845",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63845.json",
      "version": "9"
    }
  }
}



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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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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.