227 lines
13 KiB
JSON
227 lines
13 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-2024-35920",
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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": "2024-05-17T13:50:33.124Z",
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"datePublished": "2024-05-19T10:10:32.379Z",
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"dateUpdated": "2026-08-05T11:30:59.577Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:30:59.577Z"
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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\nmedia: mediatek: vcodec: adding lock to protect decoder context list\n\nAdd a lock for the ctx_list, to avoid accessing a NULL pointer\nwithin the 'vpu_dec_ipi_handler' function when the ctx_list has\nbeen deleted due to an unexpected behavior on the SCP IP block.\n\nHardware name: Google juniper sku16 board (DT)\npstate: 20400005 (nzCv daif +PAN -UAO -TCO BTYPE=--)\npc : vpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec]\nlr : scp_ipi_handler+0xd0/0x194 [mtk_scp]\nsp : ffffffc0131dbbd0\nx29: ffffffc0131dbbd0 x28: 0000000000000000\nx27: ffffff9bb277f348 x26: ffffff9bb242ad00\nx25: ffffffd2d440d3b8 x24: ffffffd2a13ff1d4\nx23: ffffff9bb7fe85a0 x22: ffffffc0133fbdb0\nx21: 0000000000000010 x20: ffffff9b050ea328\nx19: ffffffc0131dbc08 x18: 0000000000001000\nx17: 0000000000000000 x16: ffffffd2d461c6e0\nx15: 0000000000000242 x14: 000000000000018f\nx13: 000000000000004d x12: 0000000000000000\nx11: 0000000000000001 x10: fffffffffffffff0\nx9 : ffffff9bb6e793a8 x8 : 0000000000000000\nx7 : 0000000000000000 x6 : 000000000000003f\nx5 : 0000000000000040 x4 : fffffffffffffff0\nx3 : 0000000000000020 x2 : ffffff9bb6e79080\nx1 : 0000000000000010 x0 : ffffffc0131dbc08\nCall trace:\nvpu_dec_ipi_handler+0x58/0x1f8 [mtk_vcodec_dec (HASH:6c3f 2)]\nscp_ipi_handler+0xd0/0x194 [mtk_scp (HASH:7046 3)]\nmt8183_scp_irq_handler+0x44/0x88 [mtk_scp (HASH:7046 3)]\nscp_irq_handler+0x48/0x90 [mtk_scp (HASH:7046 3)]\nirq_thread_fn+0x38/0x94\nirq_thread+0x100/0x1c0\nkthread+0x140/0x1fc\nret_from_fork+0x10/0x30\nCode: 54000088 f94ca50a eb14015f 54000060 (f9400108)\n---[ end trace ace43ce36cbd5c93 ]---\nKernel panic - not syncing: Oops: Fatal exception\nSMP: stopping secondary CPUs\nKernel Offset: 0x12c4000000 from 0xffffffc010000000\nPHYS_OFFSET: 0xffffffe580000000\nCPU features: 0x08240002,2188200c\nMemory Limit: none"
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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 vulnerable code is reached by opening/closing and driving the MediaTek V4L2 decoder node `/dev/videoN`, i.e. local syscalls on the device file. There is no network-facing path into `vpu_dec_check_ap_inst()`.\nAC:L - The attacker controls both sides of the race — an `open()`/`close()` loop mutates the shared `dev->ctx_list` while decode jobs it submitted drive the SCP IPI ACKs that enter the unlocked `list_for_each_entry()`. It can also deterministically widen the window by opening many contexts and by forcing the 2000 ms `scp_ipi_send()` ACK timeout so late ACKs arrive after the context was freed.\nPR:L - `fops_vcodec_open()` enforces no capability check; any local user with access to the `/dev/video*` node (video group, and the sandboxed media/GPU processes on ChromeOS and Android that routinely hold it) can reach it. No root or CAP_* privilege is needed.\nUI:N - The attacking process performs every step itself — opening the decoder, submitting a bitstream, and closing the fd concurrently. No victim action or interaction is required.\nS:U - The corruption and the vulnerable code are both in the kernel's own security authority; the SCP co-processor merely delivers the IPI that triggers it. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unlocked traversal reads `ctx->list.next` and `ctx->vpu_inst` out of a `mtk_vcodec_dec_ctx` that was just `kfree()`d, a use-after-free read of a reallocatable slab object. Heap grooming lets the attacker supply the link pointer, turning the loop into a controlled-address dereference usable for kernel memory disclosure.\nI:H - Because the staleness guard is racy, `vpu_dec_ipi_handler()` proceeds against a freed `vdec_vpu_inst` (freed with its containing `vdec_h264_inst`/`vdec_vp9_inst` in `fops_vcodec_release()`), writing `vpu->failure`, `vpu->signaled`, and on INIT_ACK `vpu->vsi`/`vpu->inst_addr`/`vpu->inst_id` into memory that may already be reallocated. That is a use-after-free write at fixed offsets, exploitable for cross-object corruption and control-flow hijack.\nA:H - The commit records a reproduced fatal oops in `vpu_dec_ipi_handler+0x58` ending in \"Kernel panic - not syncing: Oops: Fatal exception\" with secondary CPUs stopped. Any local user able to open the decoder node can trigger this repeatedly for a full system crash."
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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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"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/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c",
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"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c",
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"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h",
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"drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c"
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"drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c",
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"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c",
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"drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.h",
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"drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c"
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"version": "6.8.6",
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"lessThanOrEqual": "6.8.*",
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"status": "unaffected",
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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