312 lines
15 KiB
JSON
312 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-2024-35919",
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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": "2024-05-17T13:50:33.123Z",
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"datePublished": "2024-05-19T10:10:31.707Z",
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"dateUpdated": "2026-08-05T11:30:58.513Z"
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},
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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 encoder context list\n\nAdd a lock for the ctx_list, to avoid accessing a NULL pointer\nwithin the 'vpu_enc_ipi_handler' function when the ctx_list has\nbeen deleted due to an unexpected behavior on the SCP IP block."
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}
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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 the MediaTek V4L2 encoder device node (/dev/videoN) and issuing encode ioctls that trigger SCP/VPU IPI replies into vpu_enc_ipi_handler(); no network or physical access is involved.\nAC:L - The attacker controls both sides of the race — one thread issues encode operations generating asynchronous SCP IPI callbacks while another thread repeatedly opens/closes encoder contexts to free the ctx mid-traversal; the handler runs in IRQ/workqueue context and can preempt the releasing task, and the window covers the whole unlocked list walk.\nPR:L - Requires only an unprivileged local process with access to the encoder video device node, which on Android and ChromeOS MediaTek devices is granted to ordinary media/codec HAL and sandboxed video processes; no CAP_SYS_ADMIN or root is needed.\nUI:N - The attacker's own processes perform every step — open, encode, and close — with no action required from any other user.\nS:U - The corruption and its consequences are confined to the kernel's own security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The unlocked traversal dereferences a freed mtk_vcodec_enc_ctx, and reclaiming that slab object lets the attacker control list.next, turning the walk into a controlled kernel-memory read oracle (comparing ctx->vpu_inst at attacker-chosen addresses) capable of disclosing arbitrary kernel data.\nI:H - vpu_enc_check_ap_inst() is the validation gate for the firmware-supplied venc_inst pointer; a spurious true from the use-after-free lets handle_enc_init_msg() and the error path write vpu->inst_addr/vpu->vsi/vpu->failure/vpu->signaled through an unvalidated pointer, and heap-spray reclamation of the freed ctx provides a write primitive usable for control-flow hijacking.\nA:H - The use-after-free reliably produces a NULL/wild pointer dereference and kernel oops — an actual panic backtrace in vpu_dec_ipi_handler on a shipping MT8183 Chromebook is documented for the identical decoder-side bug — and following a corrupted list.next can also hang the CPU in IRQ context."
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}
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]
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}
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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/encoder/mtk_vcodec_enc_drv.c",
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"drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.h",
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"drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c"
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],
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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/encoder/mtk_vcodec_enc_drv.c",
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"drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.h",
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"drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c"
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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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"description": "CWE-noinfo Not enough information"
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"type": "ssvc",
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"content": {
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"timestamp": "2024-10-31T14:03:42.763507Z",
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"id": "CVE-2024-35919",
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"options": [
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