{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-08T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()",
    "id" : "2468228",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2468228"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-125",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()\nnfnl_cthelper_dump_table() has a 'goto restart' that jumps to a label\ninside the for loop body.  When the \"last\" helper saved in cb->args[1]\nis deleted between dump rounds, every entry fails the (cur != last)\ncheck, so cb->args[1] is never cleared.  The for loop finishes with\ncb->args[0] == nf_ct_helper_hsize, and the 'goto restart' jumps back\ninto the loop body bypassing the bounds check, causing an 8-byte\nout-of-bounds read on nf_ct_helper_hash[nf_ct_helper_hsize].\nThe 'goto restart' block was meant to re-traverse the current bucket\nwhen \"last\" is no longer found, but it was placed after the for loop\ninstead of inside it.  Move the block into the for loop body so that\nthe restart only occurs while cb->args[0] is still within bounds.\nBUG: KASAN: slab-out-of-bounds in nfnl_cthelper_dump_table+0x9f/0x1b0\nRead of size 8 at addr ffff888104ca3000 by task poc_cthelper/131\nCall Trace:\nnfnl_cthelper_dump_table+0x9f/0x1b0\nnetlink_dump+0x333/0x880\nnetlink_recvmsg+0x3e2/0x4b0\nsock_recvmsg+0xde/0xf0\n__sys_recvfrom+0x150/0x200\n__x64_sys_recvfrom+0x76/0x90\ndo_syscall_64+0xc3/0x6e0\nAllocated by task 1:\n__kvmalloc_node_noprof+0x21b/0x700\nnf_ct_alloc_hashtable+0x65/0xd0\nnf_conntrack_helper_init+0x21/0x60\nnf_conntrack_init_start+0x18d/0x300\nnf_conntrack_standalone_init+0x12/0xc0", "A flaw was found in the Linux kernel's `nfnetlink_cthelper` component. This vulnerability, an out-of-bounds read, occurs in the `nfnl_cthelper_dump_table()` function when a network connection tracking helper is removed during a dump operation, leading to a bypassed bounds check. A local attacker could exploit this to cause a system crash (denial of service) or potentially access sensitive information from kernel memory." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-07-07T00:00:00Z",
    "advisory" : "RHSA-2026:36348",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8::nfv",
    "package" : "kernel-rt-0:4.18.0-553.140.1.rt7.481.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-07-07T00:00:00Z",
    "advisory" : "RHSA-2026:36349",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-553.140.1.el8_10"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "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" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-43450\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43450\nhttps://lore.kernel.org/linux-cve-announce/2026050857-CVE-2026-43450-8919@gregkh/T" ],
  "name" : "CVE-2026-43450",
  "csaw" : false
}