{
  "threat_severity" : "Important",
  "public_date" : "2026-06-24T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: futex: Drop CLONE_THREAD requirement for private default hash alloc",
    "id" : "2492413",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2492413"
  },
  "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" : "verified"
  },
  "cwe" : "CWE-825",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nfutex: Drop CLONE_THREAD requirement for private default hash alloc\nCurrently need_futex_hash_allocate_default() depends on strict pthread\nsemantics, abusing CLONE_THREAD.  This breaks the non-concurrency\nassumptions when doing the mm->futex_ref pcpu allocations, leading to\nbugs[0] when sharing the mm in other ways; ie:\nBUG: KASAN: slab-use-after-free in futex_hash_put\n... where the +1 bias can end up on a percpu counter that mm->futex_ref\nno longer points at.\nLoosen the check to cover any CLONE_VM clone, except vfork().  Excluding\nvfork keeps the existing paths untouched (no overhead), and we can't\nrace in the first place: either the parent is suspended and the child\nruns alone, or mm->futex_ref is already allocated from an earlier\nCLONE_VM.", "A flaw was found in the Linux kernel's futex subsystem. The need_futex_hash_allocate_default() function incorrectly relies on CLONE_THREAD semantics, which can lead to non-concurrency issues when memory allocations (mm->futex_ref pcpu allocations) are shared across CLONE_VM clones, excluding vfork(). This can result in a use-after-free vulnerability in futex_hash_put, a form of memory corruption. Such vulnerabilities can potentially lead to system instability or other security impacts." ],
  "statement" : "This vulnerability was introduced in Red Hat Enterprise Linux 9.8 and 10.2; therefore, earlier versions of RHEL are unaffected.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-07-24T00:00:00Z",
    "advisory" : "RHSA-2026:45114",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "kernel-0:6.12.0-211.39.1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-09-02T00:00:00Z",
    "advisory" : "RHSA-2026:62642",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "kpatch-patch"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-07-28T00:00:00Z",
    "advisory" : "RHSA-2026:47040",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.31.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-07-28T00:00:00Z",
    "advisory" : "RHSA-2026:47040",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-687.31.1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-09-02T00:00:00Z",
    "advisory" : "RHSA-2026:62640",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kpatch-patch"
  } ],
  "package_state" : [ {
    "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-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-52973\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52973\nhttps://lore.kernel.org/linux-cve-announce/2026062439-CVE-2026-52973-af9c@gregkh/T" ],
  "name" : "CVE-2026-52973",
  "csaw" : false
}