{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-97575",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-97575"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "media: v4l2-ctrls: validate AV1 tile counts",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate AV1 tile counts\n\nThe stateless AV1 decoders use tile_info.tile_cols and tile_rows as loop\nbounds and as indices into the mi_*_starts[] and *_in_sbs_minus_1[]\narrays, as the divisor for context_update_tile_id, and their product\nbounds the per-tile descriptor buffers, but std_validate_compound() does\nnot bound these u8 fields. Reject a V4L2_CTRL_TYPE_AV1_FRAME whose\ntile_cols or tile_rows exceeds V4L2_AV1_MAX_TILE_COLS / _ROWS, or whose\nproduct exceeds V4L2_AV1_MAX_TILE_COUNT. A zero tile count is left to the\nconsuming driver so the zero-initialised control that existing userspace\nsubmits is still accepted.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-97575"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1afaf85c4990fb1e3168d0d6e99246a65e526f1b"
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      "url": "https://git.kernel.org/stable/c/85df9fc79b07f1cc7c953f930ae7e675d0c1e820"
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      "url": "https://git.kernel.org/stable/c/c8891da0186fe4c04bccbbd7d84b01a3c941ac7a"
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      "url": "https://git.kernel.org/stable/c/c4c88b5ba85685043d171e0e9c9d00a8cf6a89e8"
    },
    {
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The attacker-controlled tile_info.tile_cols/tile_rows u8s enter the kernel in V4L2_CID_STATELESS_AV1_FRAME via VIDIOC_S_EXT_CTRLS (or the request-fd path through try_set_ext_ctrls_request) on a local /dev/videoN AV1 decoder; validate_av1_frame() in std_validate_compound() is that ioctl's check. No network protocol carries those fields.\nAC:L - The attacker sets tile_cols and tile_rows to any u8 (e.g. 255) in that AV1_FRAME control and queues STREAMON/MEDIA_REQUEST_IOC_QUEUE; vdec_av1_slice_setup_tile() and rockchip_vpu981_av1_dec_set_tile_info() then loop and index on those values deterministically, with no race or victim-side state.\nPR:L - hantro_open() and fops_vcodec_open() have no capable() check; v4l2_prio_check() only compares V4L2 file-handle priority among openers. An unprivileged local user who can open the decoder node (video group, udev uaccess, or Android media-codec UID) is sufficient.\nUI:N - The attacking process itself opens the stateless AV1 decoder, submits the crafted AV1_FRAME control, queues buffers, and starts streaming. No victim action such as mounting media or opening a file is required.\nS:U - The overflows stay inside the kernel's kzalloc'd vdec_av1_slice_pfc (lat_buf->private_data) and the hantro tile_info coherent DMA buffer in the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - rockchip_vpu981_av1_dec_set_tile_info() reads group_entry[tile1*tile_cols+tile0] with a product up to 255*255 past the V4L2_AV1_MAX_TILE_COUNT TILE_GROUP_ENTRY array, and indexes height_in_sbs_minus_1[tile1] past its 64-entry field, pulling adjacent kernel heap into the decode path.\nI:H - vdec_av1_slice_setup_tile() writes tile_cols+1 entries into mi_col_starts[V4L2_AV1_MAX_TILE_COLS+1] on the kzalloc'd pfc before the later product check; rockchip_vpu981_av1_dec_set_tile_info() writes 16 bytes per tile into a 128-slot (AV1_TILE_INFO_SIZE) DMA buffer for up to 255*255 tiles, an attacker-controlled kernel write.\nA:H - Those heap and DMA-buffer overruns walk into unmapped or poisoned memory and produce a kernel oops or KASAN report, and the attacker can repeat the AV1_FRAME request at will."
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}