{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-06T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: netfilter: conntrack: add missing netlink policy validations",
    "id" : "2455331",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2455331"
  },
  "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: conntrack: add missing netlink policy validations\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\nQuoting the reporter:\nnlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\nvalue directly to ct->proto.sctp.state without checking that it is\nwithin the valid range. [..]\nand: ... with exp->dir = 100, the access at\nct->master->tuplehash[100] reads 5600 bytes past the start of a\n320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\nUBSAN.", "A flaw was found in the Linux kernel's netfilter conntrack subsystem. Missing netlink policy validations allow a local attacker to provide a specially crafted input, leading to an out-of-bounds read. This vulnerability can result in information disclosure from kernel memory or potentially cause a denial of service." ],
  "statement" : "Unvalidated SCTP state and expectation direction allowed slab OOB reads. Attributes are consumed from nfnetlink without range checks until this fix. Requires CAP_NET_ADMIN to send the malformed netlink messages.",
  "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-2026-31407\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31407\nhttps://lore.kernel.org/linux-cve-announce/2026040628-CVE-2026-31407-6abd@gregkh/T" ],
  "name" : "CVE-2026-31407",
  "csaw" : false
}