{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-40970", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.603Z", "datePublished": "2024-07-12T12:32:08.788Z", "dateUpdated": "2026-08-05T11:34:18.464Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:34:18.464Z" }, "descriptions": [ { "lang": "en", "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)." } ], "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 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c", "drivers/dma/dw-axi-dmac/dw-axi-dmac.h" ], "versions": [ { "version": "ef6fb2d6f1abd56cc067c694253ea362159b5ac3", "lessThan": "7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5", "status": "affected", "versionType": "git" }, { "version": "ef6fb2d6f1abd56cc067c694253ea362159b5ac3", "lessThan": "dd42570018f5962c10f215ad9c21274ed5d3541e", "status": "affected", "versionType": "git" }, { "version": "ef6fb2d6f1abd56cc067c694253ea362159b5ac3", "lessThan": "e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66", "status": "affected", "versionType": "git" }, { "version": "ef6fb2d6f1abd56cc067c694253ea362159b5ac3", "lessThan": "9004784e8d68bcd1ac1376407ba296fa28f04dbe", "status": "affected", "versionType": "git" }, { "version": "ef6fb2d6f1abd56cc067c694253ea362159b5ac3", "lessThan": "333e11bf47fa8d477db90e2900b1ed3c9ae9b697", "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/dma/dw-axi-dmac/dw-axi-dmac-platform.c", "drivers/dma/dw-axi-dmac/dw-axi-dmac.h" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.162", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.96", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.36", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.7", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "5.12", "versionEndExcluding": "5.15.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.1.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.6.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.9.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5" }, { "url": "https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541e" }, { "url": "https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66" }, { "url": "https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbe" }, { "url": "https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697" } ], "title": "Avoid hw_desc array overrun in dw-axi-dmac", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbe", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T21:58:34.724Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-40970", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T17:02:57.618240Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:22.651Z" } } ] } }