{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-01T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: netfilter: ctnetlink: ignore explicit helper on new expectations",
    "id" : "2464469",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2464469"
  },
  "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-125",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: ctnetlink: ignore explicit helper on new expectations\nUse the existing master conntrack helper, anything else is not really\nsupported and it just makes validation more complicated, so just ignore\nwhat helper userspace suggests for this expectation.\nThis was uncovered when validating CTA_EXPECT_CLASS via different helper\nprovided by userspace than the existing master conntrack helper:\nBUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0\nRead of size 4 at addr ffff8880043fe408 by task poc/102\nCall Trace:\nnf_ct_expect_related_report+0x2479/0x27c0\nctnetlink_create_expect+0x22b/0x3b0\nctnetlink_new_expect+0x4bd/0x5c0\nnfnetlink_rcv_msg+0x67a/0x950\nnetlink_rcv_skb+0x120/0x350\nAllowing to read kernel memory bytes off the expectation boundary.\nCTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace\nvia netlink dump.", "A flaw was found in the Linux kernel's netfilter component. A local user could exploit a slab-out-of-bounds vulnerability by providing a different helper than the existing master conntrack helper when creating new expectations. This could allow an attacker to read kernel memory bytes off the expectation boundary, leading to information disclosure." ],
  "statement" : "Ctnetlink must ignore explicit helper assignment on new expectations to match documented semantics and avoid inconsistent conntrack state. Red Hat recommends patched kernels for nftables/nf_conntrack netfilter users.",
  "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" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "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-2026-43025\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43025\nhttps://lore.kernel.org/linux-cve-announce/2026050159-CVE-2026-43025-5b63@gregkh/T" ],
  "name" : "CVE-2026-43025",
  "csaw" : false
}