{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-27T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: mm/kasan: fix double free for kasan pXds",
    "id" : "2463262",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2463262"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.7",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-763",
  "details" : [ "A flaw was found in the Linux kernel. A double-free vulnerability exists in the Kernel Address Sanitizer (KASAN) component, specifically within the `kasan_free_pxd()` function. This issue arises because the function incorrectly assumes that page tables are always page-aligned, which is not consistent across all architectures. This can lead to a double-free when memory is deallocated, potentially causing a system crash and resulting in a Denial of Service (DoS)." ],
  "statement" : "This Moderate impact flaw in the Linux kernel's Kernel Address Sanitizer (KASAN) component can lead to a system crash due to a double-free vulnerability. The issue arises from incorrect assumptions about page table alignment across different architectures, potentially resulting in a Denial of Service. This flaw is exploited with a debug enable flag with needs a privileged user to exploit.",
  "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" : "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-2026-31686\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31686\nhttps://lore.kernel.org/linux-cve-announce/2026042722-CVE-2026-31686-df69@gregkh/T" ],
  "name" : "CVE-2026-31686",
  "csaw" : false
}