{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40334", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.186Z", "datePublished": "2025-12-09T04:09:51.022Z", "dateUpdated": "2026-08-05T12:09:41.567Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:09:41.567Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: validate userq buffer virtual address and size\n\nIt needs to validate the userq object virtual address to\ndetermine whether it is residented in a valid vm mapping." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The only path to the bug is `DRM_IOCTL_AMDGPU_USERQ` on a local amdgpu DRM node (`/dev/dri/renderD*`); `amdgpu_userq_ioctl()` has no network- or bus-facing entry point.\nAC:L - A single ioctl carrying attacker-chosen `queue_va`/`queue_size`/`rptr_va`/`eop_va`/`shadow_va`/`csa_va` deterministically bypasses the missing mapping-and-size check — no race, no memory-layout dependency, and user queues are on by default on shipping RDNA3/RDNA4 parts.\nPR:L - The ioctl is `DRM_AUTH|DRM_RENDER_ALLOW`, so any unprivileged local account, container, Android app or GPU cloud tenant holding a render-node fd (the default for logged-in desktop users) can reach it; no capability or DRM master rights are required.\nUI:N - The attacker issues the ioctl directly from its own process against its own DRM fd; no action by any other user is needed.\nS:U - All effects — corrupted firmware queue state, GPU VM faults and adapter reset — occur inside the kernel/GPU-driver security authority the ioctl already belongs to; no VM, IOMMU or sandbox boundary is crossed.\nC:L - Because neither the address nor the declared size is checked against a real VM mapping, the CP fetches ring packets and MQD state from GPU memory outside the intended buffer, and the kernel-reserved `seq64` aperture mapped into every client's VM can be read, disclosing other clients' user-queue fence/timeline values; the caller's own page tables still bound the read, so it is not an arbitrary kernel-memory read.\nI:H - With no bounds check on address+size, the GPU is made to write rptr and CP context-save/shadow/CSA data outside any validated mapping, including into the globally shared `adev->seq64` BO that userspace cannot otherwise map (`AMDGPU_VA_RESERVED_TOP` blocks it) and that `amdgpu_userq_fence_signaled()` reads to decide other processes' fence state — an out-of-bounds write primitive that lets an unprivileged client forge other clients' fence completions and break dma_resv synchronization.\nA:H - Unmapped or undersized queue/rptr/eop/shadow/CSA addresses make the CP fault as soon as the queue runs, hanging the queue and driving the driver's hang detection into `drm_dev_wedged_event()` and full GPU recovery, which wedges the adapter for every process on the system; any unprivileged user can repeat it in a loop." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c", "drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h", "drivers/gpu/drm/amd/amdgpu/mes_userqueue.c" ], "versions": [ { "version": "5501117d24a38dadff3dbd8d3102559b27929668", "lessThan": "5a577de86c4a1c67ca405571d6ef84e65c6897d1", "status": "affected", "versionType": "git" }, { "version": "5501117d24a38dadff3dbd8d3102559b27929668", "lessThan": "9e46b8bb0539d7bc9a9e7b3072fa4f6082490392", "status": "affected", "versionType": "git" }, { "version": "fbf136b932358da1c65eb6fedd064a33a7a96aaa", "lessThan": "9e46b8bb0539d7bc9a9e7b3072fa4f6082490392", "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/drm/amd/amdgpu/amdgpu_userq.c", "drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h", "drivers/gpu/drm/amd/amdgpu/mes_userqueue.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "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": "6.16", "versionEndExcluding": "6.17.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5a577de86c4a1c67ca405571d6ef84e65c6897d1" }, { "url": "https://git.kernel.org/stable/c/9e46b8bb0539d7bc9a9e7b3072fa4f6082490392" } ], "title": "drm/amdgpu: validate userq buffer virtual address and size", "x_generator": { "engine": "bippy-1.2.0" } } } }