{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-35919","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-17T13:50:33.123Z","datePublished":"2024-05-19T10:10:31.707Z","dateUpdated":"2026-08-05T11:30:58.513Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:30:58.513Z"},"descriptions":[{"lang":"en","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."}],"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 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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c","drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c","drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.h","drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c"],"versions":[{"version":"1972e32431ed14682909ad568c6fd660572ae6ab","lessThan":"41671f0c0182b2bae74ca7e3b0f155559e3e2fc5","status":"affected","versionType":"git"},{"version":"1972e32431ed14682909ad568c6fd660572ae6ab","lessThan":"51c84a8aac6e3b59af2b0e92ba63cabe2e641a2d","status":"affected","versionType":"git"},{"version":"1972e32431ed14682909ad568c6fd660572ae6ab","lessThan":"afaaf3a0f647a24a7bf6a2145d8ade37baaf75ad","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/media/platform/mediatek/vcodec/common/mtk_vcodec_fw_vpu.c","drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.c","drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_drv.h","drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c"],"versions":[{"version":"6.6","status":"affected"},{"version":"0","lessThan":"6.6","status":"unaffected","versionType":"semver"},{"version":"6.6.27","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.6","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","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":"6.6","versionEndExcluding":"6.6.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.8.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/41671f0c0182b2bae74ca7e3b0f155559e3e2fc5"},{"url":"https://git.kernel.org/stable/c/51c84a8aac6e3b59af2b0e92ba63cabe2e641a2d"},{"url":"https://git.kernel.org/stable/c/afaaf3a0f647a24a7bf6a2145d8ade37baaf75ad"}],"title":"media: mediatek: vcodec: adding lock to protect encoder context list","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-noinfo Not enough information"}]}],"affected":[{"vendor":"linux","product":"linux_kernel","cpes":["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"],"defaultStatus":"unknown","versions":[{"version":"1972e32431ed","status":"affected","lessThan":"41671f0c0182","versionType":"custom"},{"version":"1972e32431ed","status":"affected","lessThan":"51c84a8aac6e","versionType":"custom"},{"version":"1972e32431ed","status":"affected","lessThan":"afaaf3a0f647","versionType":"custom"},{"version":"6.6","status":"affected"},{"version":"0","status":"affected","lessThan":"6.6*","versionType":"custom"},{"version":"6.6.27","status":"affected","lessThanOrEqual":"6.6*","versionType":"custom"},{"version":"6.8.6","status":"affected","lessThanOrEqual":"6.8*","versionType":"custom"},{"version":"6.9","status":"affected","lessThanOrEqual":"*","versionType":"custom"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-10-31T14:03:42.763507Z","id":"CVE-2024-35919","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-10-31T14:08:27.502Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T03:21:49.013Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/41671f0c0182b2bae74ca7e3b0f155559e3e2fc5","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/51c84a8aac6e3b59af2b0e92ba63cabe2e641a2d","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/afaaf3a0f647a24a7bf6a2145d8ade37baaf75ad","tags":["x_transferred"]}]}]}}