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          "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."
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              "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 \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\u0027s 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-\u003epipe write corrupts num_pads/num_links/num_backlinks \u2014 counts that subsequently drive entity-\u003epads[] 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-\u003epipe = pipe, and pad-\u003epipe = 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."
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