{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72244", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.914Z", "datePublished": "2026-08-15T05:54:31.866Z", "dateUpdated": "2026-08-17T05:41:57.417Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:41:57.417Z" }, "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's min_block_size. When a candidate's\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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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's 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/buddy.c" ], "versions": [ { "version": "0a1844bf0b532d84324453374ad6845f64066c28", "lessThan": "4289531106ee175a6eb45db7d4f2734d1dae9887", "status": "affected", "versionType": "git" }, { "version": "0a1844bf0b532d84324453374ad6845f64066c28", "lessThan": "7185c5262435b93e5eeffa647008992256b9c51a", "status": "affected", "versionType": "git" }, { "version": "0a1844bf0b532d84324453374ad6845f64066c28", "lessThan": "419d7d9306491f3e0e417cf794844c73cabee090", "status": "affected", "versionType": "git" }, { "version": "0a1844bf0b532d84324453374ad6845f64066c28", "lessThan": "56bc6384314fb9ae98975fb2af8b143097ede3dc", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/buddy.c" ], "versions": [ { "version": "6.7", "status": "affected" }, { "version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }