Vulnerability-Lookup

CVE-2026-63842 (GCVE-0-2026-63842)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36

Title

drm/amdgpu/jpeg: set no_user_fence for JPEG v5.0.0 ring

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/jpeg: set no_user_fence for JPEG v5.0.0 ring JPEG rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit 0f43893d3cd478fa57836697525b338817c9c23d)

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/3a55ff19a6ff5e046…
https://git.kernel.org/stable/c/a7e63bb93a7fde3c8…
https://git.kernel.org/stable/c/69ab75c7c5f378eb4…
https://git.kernel.org/stable/c/ea7c61c5f895e8f9e…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: dfad65c65728401587142577dd283476491bac83 , < 3a55ff19a6ff5e046d6a4a18e36deec5d95d9a2e (git) Affected: dfad65c65728401587142577dd283476491bac83 , < a7e63bb93a7fde3c8920984c3deee9acfe461562 (git) Affected: dfad65c65728401587142577dd283476491bac83 , < 69ab75c7c5f378eb46f4c918aa848bb5c5603924 (git) Affected: dfad65c65728401587142577dd283476491bac83 , < ea7c61c5f895e8f9ea0ffffa180498ef9c740152 (git)	guessed
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (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

Show details on NVD website

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/jpeg_v5_0_0.c"
          ],
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          "versions": [
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              "version": "dfad65c65728401587142577dd283476491bac83",
              "versionType": "git"
            },
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
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              "version": "7.1",
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                  "versionStartIncluding": "6.9",
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                }
              ],
              "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 v5.0.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 0f43893d3cd478fa57836697525b338817c9c23d)"
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
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              "value": "AV:L - Exploitation requires submitting AMDGPU command buffers via DRM_IOCTL_AMDGPU_CS on a local /dev/dri/renderD* device; the JPEG ring is not reachable over the network.\nAC:L - An attacker with render-node access can deterministically submit a CS with an AMDGPU_CHUNK_ID_FENCE chunk and a JPEG-ring IB (AMDGPU_HW_IP_VCN_JPEG); no race or external timing is required.\nPR:L - The amdgpu_cs_ioctl path is gated by DRM_AUTH|DRM_RENDER_ALLOW, reachable by unprivileged local users with standard render-node access (render group membership), not root.\nUI:N - No victim interaction is required; the attacker triggers the malformed user-fence write through their own ioctl submission.\nS:U - Impact is confined to GPU memory writes within the attacker\u0027s amdgpu VM context; this is standard local privilege/resource abuse, not a VM escape or cross-authority boundary crossing.\nC:H - The JPEG engine performs an unsupported 64-bit fence memory write (via jpeg_v4_0_3_dec_ring_emit_fence with AMDGPU_FENCE_FLAG_64BIT), causing GPU memory corruption that can be leveraged for arbitrary read primitives within the attacker\u0027s GPU address space.\nI:H - The malformed hardware fence write can corrupt arbitrary GPU-mapped buffers in the submitter\u0027s VM, providing a write primitive that could be developed into GPU code execution or further kernel compromise.\nA:H - Incorrect fence handling can hang or reset the GPU (affecting all users of the device) and may trigger kernel GPU driver recovery paths, causing denial of service."
            }
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        "dateUpdated": "2026-08-05T12:36:19.801Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/ea7c61c5f895e8f9ea0ffffa180498ef9c740152"
        }
      ],
      "title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v5.0.0 ring",
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    "datePublished": "2026-07-19T14:04:37.212Z",
    "dateReserved": "2026-07-19T07:54:57.015Z",
    "dateUpdated": "2026-08-05T12:36:19.801Z",
    "state": "PUBLISHED"
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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 v5.0.0 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 0f43893d3cd478fa57836697525b338817c9c23d)"
          }
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                "confidentialityImpact": "HIGH",
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      "cve": "CVE-2026-63842",
      "id": "CVE-2026-63842",
      "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 v5.0.0 ring",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63842.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-10-01T00:50:22Z",
      "cve": "CVE-2026-63842",
      "id": "CVE-2026-63842",
      "initial_release_date": "2026-07-24T02:13:59Z",
      "product_status:known_affected": "396",
      "product_status:known_not_affected": "332",
      "product_status:recommended": "228",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63842",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63842.json",
      "version": "8"
    }
  }
}

WID-SEC-W-2026-2403

Vulnerability from csaf_certbund - Published: 2026-07-19 22:00 - Updated: 2026-10-08 22:00

Summary

Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Severity

Mittel

Scope

432 vulnerabilities in this advisory, including CVE-2026-63842.

CVE-2026-63842

Known affected: 15 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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.

Action not permitted

CVE-2026-63842 (GCVE-0-2026-63842)

WID-SEC-W-2026-2403

Tags

Sightings

Nomenclature

Related by attack behaviour