CVE-2026-68108 (GCVE-0-2026-68108)
Vulnerability from cvelistv5
Published
2026-08-10 11:58
Modified
2026-08-19 16:29
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu/vce: fix integer overflow in image size
Fix a security vulnerability where malicious VCE command streams
with oversized dimensions (e.g. 65536×65536) cause 32-bit integer
overflow, wrapping the calculated buffer size to 0. This bypasses
validation and allows GPU firmware to perform out-of-bound memory
access.
The fix uses 64-bit arithmetic to detect overflow and rejects
invalid dimensions before they reach the hardware.
V2: remove redundant check
V3: modify max height value
V4: remove size64
(cherry picked from commit cbe408dba581755ad1279a487ec786d8927d778d)
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c Version: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c Version: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c Version: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c Version: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c Version: f1689ec1b0b1256d0e69653cd4aaeee44aafdf5c |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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},
{
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]
},
{
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"product": "Linux",
"programFiles": [
"drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.2"
},
{
"lessThan": "4.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "4.2",
"vulnerable": true
},
{
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},
{
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{
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"vulnerable": true
},
{
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},
{
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"versionEndExcluding": "7.2",
"versionStartIncluding": "4.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vce: fix integer overflow in image size\n\nFix a security vulnerability where malicious VCE command streams\nwith oversized dimensions (e.g. 65536\u00d765536) cause 32-bit integer\noverflow, wrapping the calculated buffer size to 0. This bypasses\nvalidation and allows GPU firmware to perform out-of-bound memory\naccess.\n\nThe fix uses 64-bit arithmetic to detect overflow and rejects\ninvalid dimensions before they reach the hardware.\n\nV2: remove redundant check\nV3: modify max height value\nV4: remove size64\n\n(cherry picked from commit cbe408dba581755ad1279a487ec786d8927d778d)"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is reached only through the AMDGPU_CS DRM ioctl on a local render node (/dev/dri/renderD*); there is no network, adjacent-radio, or physical-device path to the VCE command-stream parser.\nAC:L - On affected AMD GPUs using physical-mode VCE parsing, an attacker fully controls the IB and can set create-command dimensions (e.g., 65536x65536) to deterministically overflow the 32-bit size to zero without races or uncontrollable layout conditions.\nPR:L - Exploitation requires only unprivileged local access to the amdgpu DRM render node; AMDGPU_CS is gated by DRM_AUTH|DRM_RENDER_ALLOW with no root, DRM-master, or non-namespace capability requirement.\nUI:N - No victim interaction is needed beyond the attacker submitting crafted VCE command buffers through their own render-node context; no third party must open files or take other actions.\nS:C - Bypassing size-based BO relocation/validation lets VCE firmware DMA outside the intended buffer boundaries, crossing the GPU memory-isolation boundary that kernel validation is meant to enforce on GART/VRAM mappings.\nC:H - With validation defeated, VCE firmware can read arbitrarily beyond undersized encode/context/MV buffers, exposing other GPU-accessible memory including GTT-mapped system memory and adjacent VRAM allocations.\nI:H - The same out-of-bounds VCE firmware accesses enable arbitrary writes to GPU-mapped memory beyond validated buffers, providing memory-corruption primitives suitable for privilege escalation or control-flow influence.\nA:H - Oversized VCE operations against undersized buffers can trigger GPU page faults, engine hangs, GPU resets, or broader system disruption that the attacker can repeat via further command submissions."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:29:22.109Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/893db20383800cfe92e638705984eebb13bc81a5"
},
{
"url": "https://git.kernel.org/stable/c/a07430abd556de3707adfcadcc60db3fa64e4b2b"
},
{
"url": "https://git.kernel.org/stable/c/a6d7065b91a14790980ce6f4960db0ca8c3c9940"
},
{
"url": "https://git.kernel.org/stable/c/7eebef042c12dfe0568593ee6a8926d16505925e"
},
{
"url": "https://git.kernel.org/stable/c/00c311a13d225266800c712f2b7db2711c6897de"
},
{
"url": "https://git.kernel.org/stable/c/186bfdc4e26d019b2e7570cb121964a1d89b2e5b"
}
],
"title": "drm/amdgpu/vce: fix integer overflow in image size",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68108",
"datePublished": "2026-08-10T11:58:25.241Z",
"dateReserved": "2026-07-30T09:28:09.368Z",
"dateUpdated": "2026-08-19T16:29:22.109Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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