CVE-2026-72244 (GCVE-0-2026-72244)
Vulnerability from cvelistv5
Published
2026-08-15 05:54
Modified
2026-08-17 05:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
gpu/buddy: bail out of try_harder when alignment cannot be honoured
The try_harder contiguous fallback could return a range whose start
offset did not match the caller's min_block_size. When a candidate's
start is misaligned, realign it: free the misaligned run and reallocate
exactly @size at the next lower min_block_size boundary. This keeps the
returned size unchanged with no surplus to trim, and rejects the request
only when no aligned candidate fits.
v2: align misaligned candidates down to min_block_size instead of
bailing out, for both the RHS and LHS paths (Matthew).
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/gpu/buddy.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4289531106ee175a6eb45db7d4f2734d1dae9887",
"status": "affected",
"version": "0a1844bf0b532d84324453374ad6845f64066c28",
"versionType": "git"
},
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"versionType": "git"
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{
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"status": "affected",
"version": "0a1844bf0b532d84324453374ad6845f64066c28",
"versionType": "git"
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{
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"status": "affected",
"version": "0a1844bf0b532d84324453374ad6845f64066c28",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/gpu/buddy.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"lessThan": "6.7",
"status": "unaffected",
"version": "0",
"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": "7.1.5",
"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": "6.12.101",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpu/buddy: bail out of try_harder when alignment cannot be honoured\n\nThe try_harder contiguous fallback could return a range whose start\noffset did not match the caller\u0027s min_block_size. When a candidate\u0027s\nstart is misaligned, realign it: free the misaligned run and reallocate\nexactly @size at the next lower min_block_size boundary. This keeps the\nreturned size unchanged with no surplus to trim, and rejects the request\nonly when no aligned candidate fits.\n\nv2: align misaligned candidates down to min_block_size instead of\n bailing out, for both the RHS and LHS paths (Matthew)."
}
],
"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 bug is in gpu_buddy_alloc_blocks() reached only via DRM GEM/TTM VRAM allocation ioctls (e.g. AMDGPU_GEM_CREATE, I915_GEM_CREATE, XE_GEM_CREATE) on /dev/dri/renderD*, requiring a local process with render-node access, not remote network input.\nAC:L - An attacker can deterministically fragment VRAM with many GEM allocations and frees, then request GPU_BUDDY_CONTIGUOUS_ALLOCATION to force __alloc_contig_try_harder; no race or attacker-uncontrollable memory layout is required.\nPR:L - Exploitation needs only standard unprivileged GPU client access to a DRM render node (render/video group membership), not real root or capabilities outside user namespaces; DRM_RENDER_ALLOW ioctls are available to normal desktop, container, and cloud GPU tenants.\nUI:N - No victim interaction is required; the attacker fully controls the allocation pattern and contiguous GEM creation requests needed to reach the vulnerable try_harder fallback path.\nS:U - Impact is cross-process GPU VRAM corruption or disclosure within the same kernel GPU memory authority (e.g. another user\u0027s buffers, page tables), not a VM escape, IOMMU/DMA boundary bypass, or other cross-authority scope change.\nC:H - __alloc_contig_try_harder could return a misaligned or undersized contiguous range versus min_block_size; drivers trust this without post-check, so GPU page tables/DMA can read adjacent VRAM outside the intended buffer, enabling cross-allocation information disclosure.\nI:H - The same misaligned or short contiguous mapping lets GPU hardware write beyond the allocated VRAM window, corrupting neighboring buffers (including page tables) and providing an out-of-bounds write primitive in GPU memory space.\nA:H - Incorrect contiguous VRAM placement can trigger GPU faults, AMDGPU/i915/XE recovery resets, display/compute hangs, and repeated driver-level failures when workloads use the corrupted mapping, causing high availability loss on affected systems."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:41:57.417Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/4289531106ee175a6eb45db7d4f2734d1dae9887"
},
{
"url": "https://git.kernel.org/stable/c/7185c5262435b93e5eeffa647008992256b9c51a"
},
{
"url": "https://git.kernel.org/stable/c/419d7d9306491f3e0e417cf794844c73cabee090"
},
{
"url": "https://git.kernel.org/stable/c/56bc6384314fb9ae98975fb2af8b143097ede3dc"
}
],
"title": "gpu/buddy: bail out of try_harder when alignment cannot be honoured",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72244",
"datePublished": "2026-08-15T05:54:31.866Z",
"dateReserved": "2026-08-09T03:40:39.914Z",
"dateUpdated": "2026-08-17T05:41:57.417Z",
"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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