{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47702",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-47702"
  ],
  "published": "2024-10-21T12:02:02Z",
  "summary": "bpf: Fail verification for sign-extension of packet data/data_end/data_meta",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fail verification for sign-extension of packet data/data_end/data_meta\n\nsyzbot reported a kernel crash due to\n  commit 1f1e864b6555 (\"bpf: Handle sign-extenstin ctx member accesses\").\nThe reason is due to sign-extension of 32-bit load for\npacket data/data_end/data_meta uapi field.\n\nThe original code looks like:\n        r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\n        r3 = *(u32 *)(r1 + 80) /* load __sk_buff->data_end */\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto +1\n        ...\nNote that __sk_buff->data load has 32-bit sign extension.\n\nAfter verification and convert_ctx_accesses(), the final asm code looks like:\n        r2 = *(u64 *)(r1 +208)\n        r2 = (s32)r2\n        r3 = *(u64 *)(r1 +80)\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto pc+1\n        ...\nNote that 'r2 = (s32)r2' may make the kernel __sk_buff->data address invalid\nwhich may cause runtime failure.\n\nCurrently, in C code, typically we have\n        void *data = (void *)(long)skb->data;\n        void *data_end = (void *)(long)skb->data_end;\n        ...\nand it will generate\n        r2 = *(u64 *)(r1 +208)\n        r3 = *(u64 *)(r1 +80)\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto pc+1\n\nIf we allow sign-extension,\n        void *data = (void *)(long)(int)skb->data;\n        void *data_end = (void *)(long)skb->data_end;\n        ...\nthe generated code looks like\n        r2 = *(u64 *)(r1 +208)\n        r2 <<= 32\n        r2 s>>= 32\n        r3 = *(u64 *)(r1 +80)\n        r0 = r2\n        r0 += 8\n        if r3 > r0 goto pc+1\nand this will cause verification failure since \"r2 <<= 32\" is not allowed\nas \"r2\" is a packet pointer.\n\nTo fix this issue for case\n  r2 = *(s32 *)(r1 + 76) /* load __sk_buff->data */\nthis patch added additional checking in is_valid_access() callback\nfunction for packet data/data_end/data_meta access. If those accesses\nare with sign-extenstion, the verification will fail.\n\n  [1] https://lore.kernel.org/bpf/000000000000c90eee061d236d37@google.com/",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
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        "1:6.6.47-1+rpt1",
        "1:6.6.51-1+rpt1",
        "1:6.6.51-1+rpt2",
        "1:6.6.51-1+rpt3",
        "1:6.6.62-1+rpt1",
        "1:6.6.74-1+rpt1"
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      "ecosystem_specific": {
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            "assessment": "commit ancestry (strak rule)",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-47702"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4b48228eebce2ab1b01e3133da822164472b7e46"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1620c93a1ec950d87ef327a565d3907736d3340"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f09757fe97a225ae505886eac572e4cbfba96537"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/92de36080c93296ef9005690705cba260b9bd68a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z"
  }
}