154 lines
8.7 KiB
JSON
154 lines
8.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40334",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.186Z",
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"datePublished": "2025-12-09T04:09:51.022Z",
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"dateUpdated": "2026-08-05T12:09:41.567Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:09:41.567Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
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"baseScore": 7.3,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c",
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"drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h",
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"drivers/gpu/drm/amd/amdgpu/mes_userqueue.c"
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],
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"versions": [
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{
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"version": "5501117d24a38dadff3dbd8d3102559b27929668",
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"lessThan": "5a577de86c4a1c67ca405571d6ef84e65c6897d1",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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{
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"lessThan": "9e46b8bb0539d7bc9a9e7b3072fa4f6082490392",
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c",
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"drivers/gpu/drm/amd/amdgpu/amdgpu_userq.h",
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"drivers/gpu/drm/amd/amdgpu/mes_userqueue.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.8",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.17.8"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5a577de86c4a1c67ca405571d6ef84e65c6897d1"
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},
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{
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"url": "https://git.kernel.org/stable/c/9e46b8bb0539d7bc9a9e7b3072fa4f6082490392"
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}
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],
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"title": "drm/amdgpu: validate userq buffer virtual address and size",
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