{
  "threat_severity" : "Low",
  "public_date" : "2026-03-18T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: tcp: secure_seq: add back ports to TS offset",
    "id" : "2448598",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2448598"
  },
  "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"
  },
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ntcp: secure_seq: add back ports to TS offset\nThis reverts 28ee1b746f49 (\"secure_seq: downgrade to per-host timestamp offsets\")\ntcp_tw_recycle went away in 2017.\nZhouyan Deng reported off-path TCP source port leakage via\nSYN cookie side-channel that can be fixed in multiple ways.\nOne of them is to bring back TCP ports in TS offset randomization.\nAs a bonus, we perform a single siphash() computation\nto provide both an ISN and a TS offset." ],
  "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" : "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" : "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-2026-23247\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23247\nhttps://lore.kernel.org/linux-cve-announce/2026031818-CVE-2026-23247-07b3@gregkh/T" ],
  "name" : "CVE-2026-23247",
  "csaw" : false
}