{
  "threat_severity" : "Moderate",
  "public_date" : "2026-03-25T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: x86/fred: Correct speculative safety in fred_extint()",
    "id" : "2451232",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451232"
  },
  "cvss3" : {
    "cvss3_base_score" : "3.3",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
    "status" : "draft"
  },
  "cwe" : "CWE-1037",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nx86/fred: Correct speculative safety in fred_extint()\narray_index_nospec() is no use if the result gets spilled to the stack, as\nit makes the believed safe-under-speculation value subject to memory\npredictions.\nFor all practical purposes, this means array_index_nospec() must be used in\nthe expression that accesses the array.\nAs the code currently stands, it's the wrong side of irqentry_enter(), and\n'index' is put into %ebp across the function call.\nRemove the index variable and reposition array_index_nospec(), so it's\ncalculated immediately before the array access.", "A flaw was found in the Linux kernel. This vulnerability affects the handling of speculative execution, a technique used by modern processors to improve performance. A protection mechanism intended to prevent information leakage can be bypassed when its result is temporarily stored in memory, making it vulnerable to memory prediction attacks. This could allow a local attacker to potentially gain access to sensitive information or circumvent security safeguards." ],
  "statement" : "This flaw affects x86 systems using FRED (Flexible Return and Event Delivery) interrupt handling. The array_index_nospec() protection is ineffective when the sanitized value is spilled to stack before the array access, making it vulnerable to memory prediction attacks. FRED is a newer x86 feature not present on all systems, and exploiting this requires sophisticated speculative execution attacks.",
  "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" : "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" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-23354\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23354\nhttps://lore.kernel.org/linux-cve-announce/2026032537-CVE-2026-23354-d9b2@gregkh/T" ],
  "name" : "CVE-2026-23354",
  "csaw" : false
}