{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-39481", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-25T14:23:23.746Z", "datePublished": "2024-07-05T06:55:09.916Z", "dateUpdated": "2026-08-05T11:33:35.153Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:33:35.153Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: mc: Fix graph walk in media_pipeline_start\n\nThe graph walk tries to follow all links, even if they are not between\npads. This causes a crash with, e.g. a MEDIA_LNK_FL_ANCILLARY_LINK link.\n\nFix this by allowing the walk to proceed only for MEDIA_LNK_FL_DATA_LINK\nlinks." } ], "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 graph walk is reached only through VIDIOC_STREAMON (and equivalent driver streaming paths) on a local V4L2 device node such as /dev/video0, with the topology further influenced via /dev/media0 ioctls. There is no network or adjacent-network path into media_pipeline_start().\nAC:L - On any affected system the ancillary link is created at probe time by the sensor/lens binding, so the attacker only has to open the video node and issue a single STREAMON to make the walk dereference the ancillary link — it is deterministic, with no race to win and no memory-layout preconditions.\nPR:L - Opening /dev/videoN requires only unprivileged local access that is routinely granted — systemd's uaccess udev rule gives the logged-in seat user ACL access to video4linux nodes, embedded systems use the `video` group, and on Android the camera service holds it. No capability check exists anywhere on the path from the ioctl to media_pipeline_explore_next_link().\nUI:N - The attacker performs the entire sequence themselves — open the device, optionally configure links/formats, then STREAMON. No action by any other user is needed.\nS:U - The type confusion, the wild dereferences, and the out-of-bounds pointer write all occur within kernel memory under the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Reading a struct media_entity as a struct media_pad makes the walk follow pointers harvested from wrong offsets inside struct v4l2_subdev (name+32, name+80), and the resulting pad->pipe write corrupts num_pads/num_links/num_backlinks — counts that subsequently drive entity->pads[] indexing and are copied to userspace through MEDIA_IOC_ENUM_LINKS/G_TOPOLOGY, disclosing kernel heap pointer bytes and out-of-bounds memory.\nI:H - This is a genuine type confusion that produces an 8-byte kernel-pointer write at offset 56 of a live media_entity (pad->pipe = pipe, and pad->pipe = NULL on stop), clobbering adjacent metadata fields and giving an attacker-influenced corruption primitive rather than a mere read fault.\nA:H - The commit message states outright that the unfiltered walk \"causes a crash\" with an ancillary link; the confused pointers are dereferenced in the DFS loop and in dev_dbg, producing a kernel oops on STREAMON that is trivially repeatable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/mc/mc-entity.c" ], "versions": [ { "version": "ae219872834a32da88408a92a4b4745c11f5a7ce", "lessThan": "788fd0f11e45ae8d3a8ebbd3452a6e83f92db376", "status": "affected", "versionType": "git" }, { "version": "ae219872834a32da88408a92a4b4745c11f5a7ce", "lessThan": "e80d9db99b7b6c697d8d952dfd25c3425cf61499", "status": "affected", "versionType": "git" }, { "version": "ae219872834a32da88408a92a4b4745c11f5a7ce", "lessThan": "bee9440bc0b6b3b7432f7bfde28656262a3484a2", "status": "affected", "versionType": "git" }, { "version": "ae219872834a32da88408a92a4b4745c11f5a7ce", "lessThan": "8a9d420149c477e7c97fbd6453704e4612bdd3fa", "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/mc/mc-entity.c" ], "versions": [ { "version": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.94", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.34", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.5", "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": "6.1", "versionEndExcluding": "6.1.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.9.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/788fd0f11e45ae8d3a8ebbd3452a6e83f92db376" }, { "url": "https://git.kernel.org/stable/c/e80d9db99b7b6c697d8d952dfd25c3425cf61499" }, { "url": "https://git.kernel.org/stable/c/bee9440bc0b6b3b7432f7bfde28656262a3484a2" }, { "url": "https://git.kernel.org/stable/c/8a9d420149c477e7c97fbd6453704e4612bdd3fa" } ], "title": "media: mc: Fix graph walk in media_pipeline_start", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-07-05T20:07:40.257709Z", "id": "CVE-2024-39481", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T20:07:53.742Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:26:15.883Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/788fd0f11e45ae8d3a8ebbd3452a6e83f92db376", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e80d9db99b7b6c697d8d952dfd25c3425cf61499", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/bee9440bc0b6b3b7432f7bfde28656262a3484a2", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8a9d420149c477e7c97fbd6453704e4612bdd3fa", "tags": [ "x_transferred" ] } ] } ] } }