{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-22T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: s390/syscalls: Add spectre boundary for syscall dispatch table",
    "id" : "2460693",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2460693"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-1285",
  "details" : [ "A flaw was found in the Linux kernel's s390 architecture syscalls. A local attacker, by controlling the syscall number, could potentially access memory beyond the intended syscall function pointer tables. This lack of a boundary check, related to speculative execution (Spectre), may lead to information disclosure by allowing an attacker to read sensitive data from kernel memory." ],
  "statement" : "The upstream patch adds `array_index_nospec()` guarding on s390 syscall dispatch, closing speculative out-of-table reads. Red Hat treats this as architecture-specific Spectre hardening. Customers should consume updated s390 kernels; no discrete module unload applies.",
  "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" : "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" : "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-2026-31483\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31483\nhttps://lore.kernel.org/linux-cve-announce/2026042259-CVE-2026-31483-9bc8@gregkh/T" ],
  "name" : "CVE-2026-31483",
  "csaw" : false
}