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CVE-2026-52973

7.8 · HIGH

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 str…

Published Jun 24, 2026CWE-416EPSS 0.18%

Overview

CVE-2026-52973 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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(). Excluding

vfork keeps the existing paths untouched (no overhead), and we can't

race in the first place: either the parent is suspended and the child

runs alone, or mm->futex_ref is already allocated from an earlier

CLONE_VM.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1dRefgit.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091Refgit.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6aRefaccess.redhat.com/errata/RHSA-2026:45114Refaccess.redhat.com/errata/RHSA-2026:47040Refaccess.redhat.com/security/cve/CVE-2026-52973Refbugzilla.redhat.com/show_bug.cgi?id=2492413Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52973.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52973?

CVE-2026-52973 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-52973?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-52973?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-52973?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52973 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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