{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-02T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: netfilter: bpf: defer hook memory release until rcu readers are done",
    "id" : "2454319",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2454319"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-364",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: bpf: defer hook memory release until rcu readers are done\nYiming Qian reports UaF when concurrent process is dumping hooks via\nnfnetlink_hooks:\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>\nnfnl_hook_dump_one.isra.0+0xe71/0x10f0\nnetlink_dump+0x554/0x12b0\nnfnl_hook_get+0x176/0x230\n[..]\nDefer release until after concurrent readers have completed.", "A flaw was found in the Linux kernel's netfilter BPF (Berkeley Packet Filter) component. A local attacker could exploit this by initiating a concurrent process to dump hooks via `nfnetlink_hooks`, which triggers a use-after-free vulnerability. This could lead to system instability or a denial of service (DoS) condition." ],
  "statement" : "Hook memory could be freed while `nfnl_hook_dump_one` still ran under concurrent netlink dump, causing a slab UAF. Setting up the race requires use of netfilter netlink hook APIs, which need elevated capability (typically CAP_NET_ADMIN) in practice. Impact is at least denial of service; any broader memory-corruption outcome should be confirmed by manual review.",
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-23412\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23412\nhttps://lore.kernel.org/linux-cve-announce/2026040201-CVE-2026-23412-4daa@gregkh/T" ],
  "name" : "CVE-2026-23412",
  "csaw" : false
}