{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50262",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50262"
  ],
  "published": "2024-11-09T10:18:20Z",
  "summary": "bpf: Fix out-of-bounds write in trie_get_next_key()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix out-of-bounds write in trie_get_next_key()\n\ntrie_get_next_key() allocates a node stack with size trie->max_prefixlen,\nwhile it writes (trie->max_prefixlen + 1) nodes to the stack when it has\nfull paths from the root to leaves. For example, consider a trie with\nmax_prefixlen is 8, and the nodes with key 0x00/0, 0x00/1, 0x00/2, ...\n0x00/8 inserted. Subsequent calls to trie_get_next_key with _key with\n.prefixlen = 8 make 9 nodes be written on the node stack with size 8.",
  "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-2024-50262"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8494ac079814a53fbc2258d2743e720907488ed"
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      "url": "https://git.kernel.org/stable/c/91afbc0eb3c90258ae378ae3c6ead3d2371e926d"
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      "url": "https://git.kernel.org/stable/c/590976f921723d53ac199c01d5b7b73a94875e68"
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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 vulnerability is reached exclusively through the local `bpf()` syscall (BPF_MAP_GET_NEXT_KEY / BPF_MAP_LOOKUP_BATCH) against an LPM_TRIE map fd. No network-facing code path processes remote data through trie_get_next_key().\nAC:L - The overflow is fully deterministic \u2014 the attacker builds the trie with keys 0x00/0 \u2026 0x00/max_prefixlen and issues one GET_NEXT_KEY with prefixlen == max_prefixlen. No race, no timing dependency, and the attacker also chooses key_size so the allocation sits exactly on a kmalloc bucket boundary, and can repeat the trigger arbitrarily to groom the heap.\nPR:L - Creating the map nominally needs CAP_BPF, but `bpf_token_capable()` honors ns_capable() against a BPF-token user namespace, so a delegated bpffs mount grants it to an unprivileged container process; furthermore `bpf_obj_get()` performs only a file-permission check and `map_get_next_key()` requires only FMODE_CAN_READ, so an unprivileged process holding or opening an existing pinned LPM_TRIE map fd can trigger the write with no capability at all.\nUI:N - Exploitation is entirely self-contained in the attacker's own process \u2014 map creation, element insertion, and the GET_NEXT_KEY call. No victim action of any kind is required.\nS:U - The out-of-bounds write corrupts kernel slab memory within the same kernel security authority; it is a standard local privilege-escalation surface rather than a crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The 8-byte heap overflow overwrites the first field of the adjacent slab object with a pointer to attacker-controlled data, which for the many kmalloc-64/128/256 objects that begin with a pointer yields a fake-object read primitive and, via freelist corruption, arbitrary kernel memory disclosure.\nI:H - This is a controllable out-of-bounds heap write of a valid kernel pointer at a precisely chosen slab bucket boundary, repeatable at will \u2014 a classic path to SLUB freelist corruption, arbitrary write, and control-flow hijack for privilege escalation.\nA:H - Corrupting the head of an adjacent slab object or a SLUB freelist pointer reliably produces kernel oops/panic, and the trigger can be issued repeatedly by any process holding a readable LPM_TRIE map fd."
    }
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}