{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23412",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23412"
  ],
  "published": "2026-04-02T11:41:16Z",
  "summary": "netfilter: bpf: defer hook memory release until rcu readers are done",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bpf: defer hook memory release until rcu readers are done\n\nYiming Qian reports UaF when concurrent process is dumping hooks via\nnfnetlink_hooks:\n\nBUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0\nRead of size 8 at addr ffff888003edbf88 by task poc/79\nCall Trace:\n <TASK>\n nfnl_hook_dump_one.isra.0+0xe71/0x10f0\n netlink_dump+0x554/0x12b0\n nfnl_hook_get+0x176/0x230\n [..]\n\nDefer release until after concurrent readers have completed.",
  "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-2026-23412"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d016c216bc75c45128160593a77b864a04dbe7c0"
    },
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      "url": "https://git.kernel.org/stable/c/cb2bf5efdb02a2a59faf603604a1066e8266f349"
    },
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      "url": "https://git.kernel.org/stable/c/c25e0dec366ae99b7264324ce3c7cbaea34691f9"
    },
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      "url": "https://git.kernel.org/stable/c/54244d54a971c26a0cd0a9073460ff71f3c51b32"
    },
    {
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      "url": "https://git.kernel.org/stable/c/24f90fa3994b992d1a09003a3db2599330a5232a"
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  "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 - The vulnerable paths are reached through local BPF syscalls and NETLINK_NETFILTER hook dump requests, not by unauthenticated network packets alone.\nAC:L - The bug is a race between BPF netfilter link teardown and nfnetlink hook dumping, and a local attacker can control both sides by creating/destroying links while issuing dump requests.\nPR:L - The path requires local BPF/netfilter privileges such as CAP_NET_ADMIN and BPF permissions, which are reasonably reachable in user/net namespace or delegated BPF-token deployments rather than requiring real init-namespace root.\nUI:N - No victim action is needed once the attacker can run the local operations; the attacker triggers the attach/detach and dump operations directly.\nS:U - The impact is within the kernel security authority and does not cross a VM, IOMMU, or similar separate security scope.\nC:H - This is a kernel use-after-free of a netfilter hook object read under RCU after immediate link deallocation, and heap reuse can expose controlled or stale kernel pointers and data.\nI:H - As a kernel use-after-free in attacker-influenced heap memory, it is defensibly exploitable for memory corruption or control-flow manipulation under the required overestimate rule.\nA:H - The reported KASAN slab-use-after-free in nfnl_hook_dump_one can crash or panic the kernel, and repeated local triggering can cause full system denial of service."
    }
  }
}