280 lines
15 KiB
JSON
280 lines
15 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-2024-40970",
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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": "2024-07-12T12:17:45.603Z",
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"datePublished": "2024-07-12T12:32:08.788Z",
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"dateUpdated": "2026-08-05T11:34:18.464Z"
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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": "2026-08-05T11:34:18.464Z"
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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\nAvoid hw_desc array overrun in dw-axi-dmac\n\nI have a use case where nr_buffers = 3 and in which each descriptor is composed by 3\nsegments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put()\nhandles the hw_desc considering the descs_allocated, this scenario would result in a\nkernel panic (hw_desc array will be overrun).\n\nTo fix this, the proposal is to add a new member to the axi_dma_desc structure,\nwhere we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in\naxi_desc_put() to handle the hw_desc array correctly.\n\nAdditionally I propose to remove the axi_chan_start_first_queued() call after completing\nthe transfer, since it was identified that unbalance can occur (started descriptors can\nbe interrupted and transfer ignored due to DMA channel not being enabled)."
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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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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The overrun is reached only by driving a local peripheral (audio/serial/SPI device node) whose driver queues multiple DMA descriptors on a dw-axi-dmac channel; no network- or peer-supplied data influences the descriptor accounting. Physical access is not required, so this is local.\nAC:L - The overrun is deterministic whenever two or more descriptors are outstanding on the same channel, a state the attacker arranges simply by queueing several buffers/transfers before stopping the stream. No race or unfavorable memory layout beyond the attacker's control is needed to trigger the panic.\nPR:L - A local unprivileged user with access to a device node backed by this DMA controller (e.g. /dev/snd/pcm*, tty, spidev on the affected RISC-V/ARC/Agilex5/Keem Bay platforms) can drive the prep/terminate cycle. No root or capability check guards the dmaengine client path.\nUI:N - The attacker performs the buffer queueing and stream teardown itself; no action by another user or administrator is required.\nS:U - The out-of-bounds access, the corrupted dma_pool free list, and any resulting DMA writes all occur within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The loop reads well past the end of the kmalloc-96 hw_desc array into adjacent slab objects, and the resulting free-list poisoning lets a later dma_pool_alloc() return an attacker-chosen address usable as a read primitive over arbitrary kernel memory. The leak is not bounded to a few bytes.\nI:H - pool_block_push() writes the dma address and next-block pointer at the out-of-bounds-derived vaddr with no validation in the non-DMAPOOL_DEBUG path, and links that address into the pool free list so the DMA engine subsequently writes hardware LLI data there. This yields an arbitrary kernel write suitable for control-flow hijacking.\nA:H - The commit explicitly documents a kernel panic from the hw_desc array overrun, and freeing a NULL/garbage vaddr into the dma pool oopses immediately. The counter underflow from atomic_sub() further corrupts channel state, so the crash is repeatable."
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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/dma/dw-axi-dmac/dw-axi-dmac-platform.c",
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"drivers/dma/dw-axi-dmac/dw-axi-dmac.h"
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],
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"status": "affected",
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"status": "affected",
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"programFiles": [
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"drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c",
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"drivers/dma/dw-axi-dmac/dw-axi-dmac.h"
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],
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"versions": [
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{
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"version": "5.12",
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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": "5.12",
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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": "5.15.162",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.96",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.36",
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"lessThanOrEqual": "6.6.*",
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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": "6.9.7",
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"lessThanOrEqual": "6.9.*",
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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": "6.10",
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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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