SECUFOCUSNOW
Home›CVE index›CVE-2026-52973
Review reviewHigh

CVE-2026-52973

Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9

In the Linux kernel, the following vulnerability has been resolved: futex: Drop CLONE_THREAD requirement for private default hash alloc Currently need_futex_hash_allocate_default() depends on strict pthread semantics, abusing CLONE_THREAD. This breaks the non-concurrency assumptions when doing the mm->futex_ref pcpu allocations, leading to bugs[0] when sharing the mm in other ways; ie: BUG: KASAN: slab-use-after-free in futex_hash_put ... where the +1 bias can end up on a percpu counter that mm->futex_ref no longer points at. Loosen the check to cover any CLONE_VM clone, except vfork(). Exc...

CVSS
7.8
EPSS
0.14%
3.89% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: futex: Drop CLONE_THREAD requirement for private default hash alloc Currently need_futex_hash_allocate_default() depends on strict pthread semantics, abusing CLONE_THREAD. This breaks the non-concurrency assumptions when doing the mm->futex_ref pcpu allocations, leading to bugs[0] when sharing the mm in other ways; ie: BUG: KASAN: slab-use-after-free in futex_hash_put ... where the +1 bias can end up on a percpu counter that mm->futex_ref no longer points at. Loosen the check to cover any CLONE_VM clone, except vfork(). Exc...

Affected product and versions

Product
Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9
Affected versions
>= d9b05321e21e4b218de4ce8a590bf375f58b6346 < 1dcd36420af2da5bd59306dba9caf78e3d248b1d, >= d9b05321e21e4b218de4ce8a590bf375f58b6346 < 974ac49a9a068b0591a59f65c63eb06579a13091, >= d9b05321e21e4b218de4ce8a590bf375f58b6346 < ee9dce44362b2d8132c32964656ab6dff7dfbc6a, >= 6.17, >= 6.17.1 < 6.18.33, >= 6.19 < 7.0.10, 6.17, 7.1
Fixed versions
6.18.33, 7.0.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416, CWE-825
CVE-2026-52973 — Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 | SECUFOCUS NOW