{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-36937",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-36937"
  ],
  "published": "2024-05-30T15:29:45Z",
  "summary": "xdp: use flags field to disambiguate broadcast redirect",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: use flags field to disambiguate broadcast redirect\n\nWhen redirecting a packet using XDP, the bpf_redirect_map() helper will set\nup the redirect destination information in struct bpf_redirect_info (using\nthe __bpf_xdp_redirect_map() helper function), and the xdp_do_redirect()\nfunction will read this information after the XDP program returns and pass\nthe frame on to the right redirect destination.\n\nWhen using the BPF_F_BROADCAST flag to do multicast redirect to a whole\nmap, __bpf_xdp_redirect_map() sets the 'map' pointer in struct\nbpf_redirect_info to point to the destination map to be broadcast. And\nxdp_do_redirect() reacts to the value of this map pointer to decide whether\nit's dealing with a broadcast or a single-value redirect. However, if the\ndestination map is being destroyed before xdp_do_redirect() is called, the\nmap pointer will be cleared out (by bpf_clear_redirect_map()) without\nwaiting for any XDP programs to stop running. This causes xdp_do_redirect()\nto think that the redirect was to a single target, but the target pointer\nis also NULL (since broadcast redirects don't have a single target), so\nthis causes a crash when a NULL pointer is passed to dev_map_enqueue().\n\nTo fix this, change xdp_do_redirect() to react directly to the presence of\nthe BPF_F_BROADCAST flag in the 'flags' value in struct bpf_redirect_info\nto disambiguate between a single-target and a broadcast redirect. And only\nread the 'map' pointer if the broadcast flag is set, aborting if that has\nbeen cleared out in the meantime. This prevents the crash, while keeping\nthe atomic (cmpxchg-based) clearing of the map pointer itself, and without\nadding any more checks in the non-broadcast fast path.",
  "affected": [
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        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
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        "1:6.1.47-1+rpt4",
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        "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"
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-36937"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/12481f30128fbebc2eeb55eb2d56390fdfa30c5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/272bfb019f3cc018f654b992115774e77b4f3ffc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e22e25820fa04ea5eaac4ef7ee200e9923f466a4"
    },
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      "url": "https://git.kernel.org/stable/c/6fd81f9d333e7b3532036577b1beb74ba1323553"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5bcf0dcbf9066348058b88a510c57f70f384c92c"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}