CVE-2026-63855 (GCVE-0-2026-63855)
Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-10-19 20:07
VLAI
EPSS
VEX
Title
drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings
VCN encoder and decoder rings do not support 64-bit user fence writes,
reject CS submissions with user fences.
(cherry picked from commit efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:32 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
28c17d72072b7ce5cc13a527dcbfc045cc995e7d , < 2c6fb056567efb49f8674108b86088a1cfaa86d0
(git)
Affected: 28c17d72072b7ce5cc13a527dcbfc045cc995e7d , < 8f0ea4524dc71c6c9ec97f2711f46e12f624140f (git) Affected: 28c17d72072b7ce5cc13a527dcbfc045cc995e7d , < 602d4c5872b25ddd4d82fb2025efb9a05b187bb3 (git) Affected: 28c17d72072b7ce5cc13a527dcbfc045cc995e7d , < 5a3c6f76cab164a5d803084908d7050f649ab7f9 (git) Affected: 28c17d72072b7ce5cc13a527dcbfc045cc995e7d , < 4f317863a3ab212a027d8c8c3cc3af4e3fb95704 (git) |
guessed | |
| Linux | Linux |
Affected:
5.4
Unaffected: 0 , < 5.4 (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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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)"
}
],
"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 - The vulnerability is reached only through the local DRM_AMDGPU_CS ioctl on a /dev/dri/renderD* node; there is no network, Bluetooth, or physical-access attack path to the VCN command submission code.\nAC:L - On affected AMD Instinct MI100 systems, an attacker with render-node access can reliably submit a VCN enc/dec command buffer with a user-fence chunk using standard libdrm/amdgpu APIs, triggering the malformed 64-bit fence write without races or victim-dependent timing.\nPR:L - Exploitation requires opening the DRM render node and submitting GPU commands, which needs only local user privileges (typically membership in the render/video group) on multi-tenant GPU cloud instances, workstations, or containers with GPU access\u2014not root or capabilities obtainable only in the init namespace.\nUI:N - No victim interaction is required; the attacker directly crafts and submits the malicious command submission through the render node without needing another user to open files, mount filesystems, or perform any action.\nS:U - The misdirected GPU fence write corrupts memory within the attacker\u0027s own GPU virtual address space on the assigned device; it does not cross a VM, container, or IOMMU security boundary to affect another security authority.\nC:H - The bug causes GPU-initiated writes to an incorrectly decoded address, constituting out-of-bounds memory corruption that can be leveraged to read adjacent GPU-mapped buffers and disclose sensitive data from the attacker\u0027s or co-resident GPU allocations.\nI:H - The hardware fence completion write is an attacker-controlled 64-bit store to a mis-decoded GPU virtual address, providing an arbitrary GPU memory write primitive that could corrupt kernel-visible GTT mappings or GPU state for further exploitation.\nA:H - Misdirected fence writes to unmapped or invalid GPU addresses can cause GPU faults, engine hangs, or full GPU resets that deny video codec and compute service on the affected accelerator."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:36:33.839Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0"
},
{
"url": "https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f"
},
{
"url": "https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3"
},
{
"url": "https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9"
},
{
"url": "https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704"
}
],
"title": "drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-63855",
"datePublished": "2026-07-19T14:04:45.096Z",
"dateReserved": "2026-07-19T07:54:57.016Z",
"dateUpdated": "2026-10-19T20:07:51.946Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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Vulnerability timeline
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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.