CVE-2026-63845 (GCVE-0-2026-63845)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-08-05 12:36
VLAI
EPSS
VEX
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)
Assigner
References
Impacted products
2 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 | |
| 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) |
guessed |
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"programFiles": [
"drivers/gpu/drm/amd/amdgpu/jpeg_v4_0.c"
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"programFiles": [
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"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "5.19"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.6.141",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.12.91",
"versionType": "semver"
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{
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"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": [
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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)"
}
],
"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": [
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"lang": "en",
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:36:23.065Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/d4e0172a1b614373385e9b7111b580f8d2e0b98f"
},
{
"url": "https://git.kernel.org/stable/c/a676f16ea9a7df96d69f405afb6eb349571b3382"
},
{
"url": "https://git.kernel.org/stable/c/6876d05b899102f4dfdb9ad560132126144c1c72"
},
{
"url": "https://git.kernel.org/stable/c/af4b458daa597dae707bf3f1f74745f5fc133ca2"
},
{
"url": "https://git.kernel.org/stable/c/e7e90b5839aeb8805ec83bb4da610b8dab8e184d"
}
],
"title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0 ring",
"x_generator": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-63845",
"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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"dataVersion": "5.2",
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"date": "2026-09-30",
"epss": "0.00175",
"percentile": "0.06295"
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"descriptions": [
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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)"
}
],
"id": "CVE-2026-63845",
"lastModified": "2026-07-27T17:44:23.777",
"metrics": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2026-07-19T15:16:51.290",
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"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"
},
"suse_vex": {
"aggregate_severity": "moderate",
"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| 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.
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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.
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.
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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.
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