CVE-2026-63846 (GCVE-0-2026-63846)

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 v3.0 ring
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring JPEG rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 4d7d774f100efb5089c86a1fb8c5bf47c63fc9ef)
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: dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 , < ee035a9d3eed3a9f5a3e83c31a10b321c9598861 (git)
Affected: dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 , < 303da8279f195cc741adc52c1b44d6b64de63bb0 (git)
Affected: dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 , < 5ada37d7f736f9feeaa06a25e470a4c74e67a61a (git)
Affected: dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 , < 48ce00787e3fddd2b45692fc991b8ab128343da5 (git)
Affected: dfd57dbf44ddc70c90c76f83b2deb46e5dd40ce3 , < a2baf12eec41f246689e6a3f8619af1200031576 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (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)
guessed Create a notification for this product.
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          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/jpeg_v3_0.c"
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              "versionType": "semver"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 4d7d774f100efb5089c86a1fb8c5bf47c63fc9ef)"
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            "version": "3.1"
          },
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              "value": "AV:L - The vulnerable code is reached only through DRM_IOCTL_AMDGPU_CS on an AMDGPU render node (/dev/dri/renderD*), requiring a local ioctl to submit a command buffer with AMDGPU_CHUNK_ID_FENCE to the JPEG v3.0 decode ring (AMDGPU_HW_IP_VCN_JPEG).\nAC:L - On affected VCN 3.0.x hardware with JPEG v3.0 (e.g. Navi 21/Sienna_Cichlid RX 6000 series), an attacker fully controls CS submission parameters and can reliably trigger the unsupported 64-bit user fence path without races or conditions beyond attacker control.\nPR:L - DRM_IOCTL_AMDGPU_CS is gated by DRM_AUTH|DRM_RENDER_ALLOW, requiring only local access to the render node available to unprivileged users in the render group or equivalent permissions, not root or special capabilities.\nUI:N - Exploitation requires no victim interaction beyond the attacker (or their process) opening the render node and submitting crafted GPU command buffers with user fences.\nS:U - The impact is confined to the attacker\u0027s GPU security context (their process VM and GPU mappings); exploitation does not cross VM, container, or IOMMU boundaries to affect other security authorities.\nC:H - The unsupported 64-bit user fence causes the GPU to perform unintended memory writes that can corrupt adjacent GPU-accessible memory, and memory corruption primitives can be leveraged for information disclosure.\nI:H - The GPU writes a fence sequence number via GPCOM to an attacker-influenced GPU virtual address, providing a controlled write primitive that can corrupt GPU memory and potentially be chained for further exploitation.\nA:H - Malformed fence operations on unsupported hardware can hang or fault the GPU subsystem, requiring a GPU reset and denying availability of graphics/compute workloads."
            }
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        {
          "url": "https://git.kernel.org/stable/c/a2baf12eec41f246689e6a3f8619af1200031576"
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      "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring",
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    "dateReserved": "2026-07-19T07:54:57.016Z",
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    "state": "PUBLISHED"
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      "cve": "CVE-2026-63846",
      "id": "CVE-2026-63846",
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      "product_status:known_affected": "198",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: drm/amdgpu/jpeg: set no_user_fence for JPEG v3.0 ring",
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      "cve": "CVE-2026-63846",
      "id": "CVE-2026-63846",
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      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63846",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63846.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.

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  • 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.
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  • 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.


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