{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53031",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53031"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "bpf: Validate node_id in arena_alloc_pages()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Validate node_id in arena_alloc_pages()\n\narena_alloc_pages() accepts a plain int node_id and forwards it through\nthe entire allocation chain without any bounds checking.\n\nValidate node_id before passing it down the allocation chain in\narena_alloc_pages().",
  "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-2026-53031"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/31d3b4b28e55835646d6829d60023f730dd34e85"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e15900888c09480a4c632bc598f1c5bd39bed6d6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb66e20130f95a93ffea1677252526a9e39170b2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2845989f2ebaf7848e4eccf9a779daf3156ea0a5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - An attacker must use local BPF syscalls to create/use a BPF arena map and load/execute a BPF program that calls the arena kfunc. The vulnerable path is not reachable directly from network, adjacent, or physical input.\nAC:L - The attacker directly controls the `node_id` argument passed to `bpf_arena_alloc_pages()` and can repeatedly trigger the BPF program. No race or external condition is required.\nPR:L - Using BPF arena requires BPF privileges (`CAP_BPF` and `CAP_PERFMON`) or a delegated BPF token, which can be available to a namespaced/container user in a reasonable deployment. Under the required higher-severity tie-break rule, this is scored as low rather than high privilege.\nUI:N - No victim action is required after the attacker has local ability to load and run the BPF program. The attacker can trigger the kfunc directly through BPF execution.\nS:U - The vulnerable component and impacted resource are both the local kernel. This is standard local kernel compromise/DoS scope, not a VM or hardware boundary crossing.\nC:H - The unchecked `node_id` flows into NUMA allocator metadata lookup (`NODE_DATA`/zonelists), creating out-of-bounds or invalid kernel memory access rather than a bounded harmless failure. Under the higher-severity rule, allocator metadata misuse is treated as potentially enabling high-impact information disclosure.\nI:H - Invalid NUMA allocator state can cause the page allocator to operate on bogus per-node/zone structures, which can plausibly corrupt kernel allocator state. Under the higher-severity rule, this is scored as potential high-integrity kernel memory corruption.\nA:H - Invalid negative, out-of-range, or offline node IDs can hit allocator assertions, NULL/invalid dereferences, or corrupted zonelist traversal, causing an oops/panic. The attacker can trigger this repeatedly from the malicious BPF program."
    }
  }
}