{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-27431",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-27431"
  ],
  "published": "2024-05-17T12:02:33Z",
  "summary": "cpumap: Zero-initialise xdp_rxq_info struct before running XDP program",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpumap: Zero-initialise xdp_rxq_info struct before running XDP program\n\nWhen running an XDP program that is attached to a cpumap entry, we don't\ninitialise the xdp_rxq_info data structure being used in the xdp_buff\nthat backs the XDP program invocation. Tobias noticed that this leads to\nrandom values being returned as the xdp_md->rx_queue_index value for XDP\nprograms running in a cpumap.\n\nThis means we're basically returning the contents of the uninitialised\nmemory, which is bad. Fix this by zero-initialising the rxq data\nstructure before running the XDP program.",
  "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-2024-27431"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5f4e51abfbe6eb444fa91906a5cd083044278297"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f0363af9619c77730764f10360e36c6445c12f7b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3420b3ff1ff489c177ea1cb7bd9fbbc4e9a0be95"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f562e4c4aab00986dde3093c4be919c3f2b85a4a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eaa7cb836659ced2d9f814ac32aa3ec193803ed6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2487007aa3b9fafbd2cb14068f49791ce1d7ede5"
    }
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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 - Exploitation requires the attacker to load a BPF program and populate a CPUMAP entry via the local bpf() syscall, then attach XDP to a local netdev; network packets only serve as the trigger the attacker generates themselves. No remote peer can reach this code path.\nAC:L - The uninitialized read is deterministic on every cpumap XDP invocation, and the attacker fully controls the setup (own veth/MTU, own XDP program, own traffic), so it can be triggered repeatedly and reliably, including grooming the kthread stack residue across unlimited retries.\nPR:L - Requires CAP_BPF plus CAP_NET_ADMIN, which are routinely delegated to non-root network daemons and container workloads (Cilium-style XDP/cpumap pipelines) rather than requiring full root; consistent with scoring of other BPF/XDP subsystem issues.\nUI:N - The attacker performs every step \u2014 map creation, program attach, and packet injection through their own interface \u2014 with no action needed from any other user.\nS:U - Both the uninitialized stack disclosure and the out-of-bounds fragment write are contained within the kernel's own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Uninitialized cpumap kthread stack memory is handed directly to the BPF program via xdp_md->rx_queue_index and exfiltrated to userspace, repeatedly and with groomable content, leaking kernel pointers; the accompanying frag_size corruption additionally provides memory-corruption primitives leverageable for broader disclosure.\nI:H - Garbage rxq.frag_size makes the unsigned tailroom computation in bpf_xdp_frags_increase_tail() underflow, bypassing the bounds check and permitting memset() of an attacker-chosen length past the last fragment \u2014 an out-of-bounds heap write, plus inconsistent sinfo->xdp_frags_size accounting propagated into subsequent skb construction.\nA:H - The out-of-bounds zeroing of adjacent page/heap memory corrupts unrelated kernel structures and leads to oops or panic, and the bogus queue_index/frag_size values also cause misrouted XSK redirects and inconsistent frame accounting in the receive path."
    }
  }
}