{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-22T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: ext4: fix use-after-free in update_super_work when racing with umount",
    "id" : "2460704",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2460704"
  },
  "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-825",
  "details" : [ "A flaw was found in the Linux kernel's ext4 filesystem. This vulnerability, a use-after-free, occurs due to a timing issue when the `update_super_work` function attempts to access memory that has already been released during a filesystem unmount operation. A local attacker could potentially exploit this flaw, leading to system instability or a denial of service (DoS)." ],
  "statement" : "Red Hat recognizes the upstream ext4 teardown race between sysfs notification and superblock update work. The failure mode involves freed kernfs state during unmount; practical impact is integrity/availability of the local system. Fixes will be delivered through standard kernel maintenance. Unmount-heavy automation should plan for patched kernels.",
  "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" : "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" : "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-2026-31446\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31446\nhttps://lore.kernel.org/linux-cve-announce/2026042246-CVE-2026-31446-8993@gregkh/T" ],
  "name" : "CVE-2026-31446",
  "mitigation" : {
    "value" : "To mitigate this issue, prevent the ext4 module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.",
    "lang" : "en:us"
  },
  "csaw" : false
}