329 lines
17 KiB
JSON
329 lines
17 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-2024-39471",
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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": "2024-06-25T14:23:23.745Z",
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"datePublished": "2024-06-25T14:28:56.906Z",
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"dateUpdated": "2026-08-05T11:33:28.594Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:33:28.594Z"
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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: add error handle to avoid out-of-bounds\n\nif the sdma_v4_0_irq_id_to_seq return -EINVAL, the process should\nbe stop to avoid out-of-bounds read, so directly return -EINVAL."
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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:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:L - The amdgpu SDMA trap interrupt handler is only reachable on a machine with a local AMD GPU, driven through the DRM device/render nodes (`/dev/dri/renderD*`) and the GPU interrupt ring. There is no network or adjacent-network path to this code.\nAC:L - The out-of-bounds index is fully deterministic — once an interrupt vector with an unmatched SDMA client ID is processed, `-EINVAL` is used as the array index every time, with no race window, no memory-layout guessing, and no state the attacker must wait for. A local user with render-node access can keep the SDMA engines and their trap/error interrupts firing continuously to reach the handler repeatedly.\nPR:L - Exercising SDMA queues and provoking trap interrupts only requires opening the unprivileged DRM render node, which is group-readable to ordinary logged-in users on desktops, Android devices, and GPU cloud/container instances. No CAP_SYS_ADMIN or root in the initial namespace is needed.\nUI:N - The interrupt handler runs asynchronously from GPU activity the attacker's own process generates; no victim must open a file, mount anything, or take any action.\nS:U - The corruption is confined to kernel memory within the same security authority as the host kernel; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `adev->sdma.instance[0xFFFFFFEA]` is an unbounded out-of-bounds read many gigabytes beyond the array, and `amdgpu_fence_process()` then dereferences the resulting `struct amdgpu_ring`, reading `fence_drv.last_seq`, `sync_seq`, `num_fences_mask`, `adev`, and the `fences[]` pointer array from that location — arbitrary kernel memory read, not a bounded few-byte overread.\nI:H - The wild pointer is not merely read: `amdgpu_fence_process()` performs `atomic_cmpxchg()` on `drv->last_seq`, `timer_delete()` on `fence_drv.fallback_timer`, `RCU_INIT_POINTER(*ptr, NULL)` stores into `drv->fences[]`, and `dma_fence_put()` (a refcount decrement plus potential release callback) on the garbage pointer — out-of-bounds writes and a refcount-decrement primitive that are the classic building blocks for control-flow hijacking.\nA:H - Dereferencing a pointer several terabytes out of range in hard-interrupt context faults on unmapped kernel memory, producing an oops/panic that cannot be recovered from in IRQ context, and the corrupting writes and bogus `dma_fence_put()` release paths add further crash modes."
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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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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c"
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