CVE-2026-63844 (GCVE-0-2026-63844)
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 v4.0.3 ring
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.3 ring
JPEG rings do not support 64-bit user fence writes, reject CS
submissions with user fences.
(cherry picked from commit 2f6afc97d259d530f4f86c7743efbc573a8da927)
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e684e654eba9481a9f462a7bbf5c385b7d1c076e , < b884ff67d62ef514eee9d5f605c03101c8b6bc98
(git)
Affected: e684e654eba9481a9f462a7bbf5c385b7d1c076e , < d6bd2a5fd611ec9c8a2411f084cff2435c709608 (git) Affected: e684e654eba9481a9f462a7bbf5c385b7d1c076e , < 8549b3933038e68dc61cb934b9a54223dd244a78 (git) Affected: e684e654eba9481a9f462a7bbf5c385b7d1c076e , < 249fa7549736de1c8e327d7ca6b32fa148a40bd6 (git) Affected: e684e654eba9481a9f462a7bbf5c385b7d1c076e , < 83e37c0987ca92f9e87789b46dd311dcf5a4a6c8 (git) |
guessed | |
| Linux | Linux |
Affected:
6.5
Unaffected: 0 , < 6.5 (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_3.c"
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"versionType": "git"
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"lessThan": "6.5",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.141",
"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"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"versionEndExcluding": "6.6.141",
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{
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"negate": false,
"operator": "OR"
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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 v4.0.3 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 2f6afc97d259d530f4f86c7743efbc573a8da927)"
}
],
"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": [
{
"lang": "en",
"value": "AV:L - Exploitation requires local access to the AMDGPU DRM render node and the DRM_IOCTL_AMDGPU_CS ioctl path; there is no network, adjacent-wireless, or physical-access entry point to the vulnerable JPEG ring submission code.\nAC:L - An attacker with render-node access can deterministically submit a command stream to the VCN JPEG ring with an AMDGPU_CHUNK_ID_FENCE user-fence chunk; no race or attacker-uncontrollable memory layout is required beyond having affected VCN 4.0.3 hardware.\nPR:L - The vulnerable amdgpu_cs_ioctl handler is gated by DRM_AUTH|DRM_RENDER_ALLOW, requiring a local unprivileged user with access to /dev/dri/renderD* (typically the render/video group), not root or capabilities obtainable only in the init namespace.\nUI:N - Once the attacker has render-node access, triggering the bug is fully programmatic via ioctl/GEM setup and does not require any additional victim interaction such as opening files or mounting filesystems.\nS:U - Impact is confined to the AMDGPU driver/GPU memory domain of the submitting process\u0027s security context; this is not a KVM guest-to-host escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Incorrect 64-bit user-fence handling on JPEG hardware can cause GPU-initiated writes to unintended addresses in GPU-visible memory, a memory-corruption primitive that can be leveraged for arbitrary kernel/GPU memory disclosure beyond the intended fence buffer.\nI:H - The bug allows the GPU to perform unintended memory writes when processing user-fence completion on a ring that lacks 64-bit user-fence support, providing a writable corruption primitive that could be developed into further code execution or privilege escalation.\nA:H - Submitting unsupported user fences to the JPEG v4.0.3 ring can hang or reset the GPU/firmware and trigger repeated denial of service on affected AMD systems (workstations, laptops, cloud GPU instances) using VCN 4.0.3."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:36:21.992Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/b884ff67d62ef514eee9d5f605c03101c8b6bc98"
},
{
"url": "https://git.kernel.org/stable/c/d6bd2a5fd611ec9c8a2411f084cff2435c709608"
},
{
"url": "https://git.kernel.org/stable/c/8549b3933038e68dc61cb934b9a54223dd244a78"
},
{
"url": "https://git.kernel.org/stable/c/249fa7549736de1c8e327d7ca6b32fa148a40bd6"
},
{
"url": "https://git.kernel.org/stable/c/83e37c0987ca92f9e87789b46dd311dcf5a4a6c8"
}
],
"title": "drm/amdgpu/jpeg: set no_user_fence for JPEG v4.0.3 ring",
"x_generator": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-63844",
"datePublished": "2026-07-19T14:04:38.452Z",
"dateReserved": "2026-07-19T07:54:57.015Z",
"dateUpdated": "2026-08-05T12:36:21.992Z",
"state": "PUBLISHED"
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"date": "2026-09-30",
"epss": "0.00175",
"percentile": "0.06295"
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"version": "6.18.33",
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}
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"cveTags": [],
"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 v4.0.3 ring\n\nJPEG rings do not support 64-bit user fence writes, reject CS\nsubmissions with user fences.\n\n(cherry picked from commit 2f6afc97d259d530f4f86c7743efbc573a8da927)"
}
],
"id": "CVE-2026-63844",
"lastModified": "2026-07-27T17:44:23.777",
"metrics": {
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"attackVector": "LOCAL",
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"baseScore": 7.8,
"baseSeverity": "HIGH",
"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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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2026-07-19T15:16:51.187",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
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},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-07-31T18:58:11+00:00",
"cve": "CVE-2026-63844",
"id": "CVE-2026-63844",
"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 v4.0.3 ring",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63844.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-18T00:47:44Z",
"cve": "CVE-2026-63844",
"id": "CVE-2026-63844",
"initial_release_date": "2026-07-24T02:13:55Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "424",
"product_status:known_not_affected": "287",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-63844",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63844.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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