{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-39481", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-39481" ], "published": "2024-07-05T06:55:29Z", "summary": "media: mc: Fix graph walk in media_pipeline_start", "details": "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.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": 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"https://git.kernel.org/stable/c/788fd0f11e45ae8d3a8ebbd3452a6e83f92db376" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e80d9db99b7b6c697d8d952dfd25c3425cf61499" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/bee9440bc0b6b3b7432f7bfde28656262a3484a2" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8a9d420149c477e7c97fbd6453704e4612bdd3fa" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "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 \u2014 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 \u2014 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 \u2014 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 \u2014 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." } } }