{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47697",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-47697"
  ],
  "published": "2024-10-21T12:02:02Z",
  "summary": "drivers: media: dvb-frontends/rtl2830: fix an out-of-bounds write error",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: media: dvb-frontends/rtl2830: fix an out-of-bounds write error\n\nEnsure index in rtl2830_pid_filter does not exceed 31 to prevent\nout-of-bounds access.\n\ndev->filters is a 32-bit value, so set_bit and clear_bit functions should\nonly operate on indices from 0 to 31. If index is 32, it will attempt to\naccess a non-existent 33rd bit, leading to out-of-bounds access.\nChange the boundary check from index > 32 to index >= 32 to resolve this\nissue.",
  "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-2024-47697"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ffbe7d07b8e76193b151107878ddc1ccc94deb5"
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      "url": "https://git.kernel.org/stable/c/883f794c6e498ae24680aead55c16f66b06cfc30"
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      "url": "https://git.kernel.org/stable/c/badbd736e6649c4e6d7b4ff7e2b9857acfa9ea94"
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  "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 code is reached only through ioctls (DMX_SET_PES_FILTER/DMX_ADD_PID plus DMX_START) on the local DVB demux device node /dev/dvb/adapterN/demux0. No network or remote-peer data reaches rtl2830_pid_filter().\nAC:L - The attacker drives the path deterministically by adding PID filter feeds via ioctl on an already-attached RTL2831U tuner; there is no race, no memory-layout dependency, and no unpredictable state involved in reaching the boundary check.\nPR:L - No capability check exists on the path \u2014 dvb_usb_start_feed() and rtl28xxu_pid_filter() perform no privilege validation \u2014 so only permission to open the DVB demux character device (commonly the video group, and world-accessible on many embedded/set-top media appliances) is needed.\nUI:N - Once the tuner device is bound, the attacker triggers the path entirely on their own via ioctls on the demux node; no victim action is required.\nS:U - The out-of-bounds write and any resulting corruption stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - An out-of-bounds bit write past the end of the filters bitmap corrupts adjacent kernel memory in struct rtl2830_dev, and per kernel scoring guidance memory corruption of this kind is treated as leverageable toward information disclosure.\nI:H - This is an out-of-bounds write \u2014 set_bit()/clear_bit() operate on bit 32 of a 32-bit filter bitmap, modifying kernel memory outside the intended object field, and the register write also goes past the end of the demodulator's PID register block.\nA:H - Corrupting kernel memory adjacent to the filter bitmap (including the driver's fe_status word on 32-bit builds) and writing an out-of-range demodulator register can leave the driver and device in an inconsistent state leading to a crash or hang."
    }
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}