Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.17.1, < 6.18.33 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1dPatch
- https://git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091Patch
- https://git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6aPatch
- https://access.redhat.com/errata/RHSA-2026:45114
- https://access.redhat.com/errata/RHSA-2026:47040
- https://access.redhat.com/security/cve/CVE-2026-52973Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2492413Issue TrackingThird Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52973.jsonThird Party Advisory
FAQ
What is CVE-2026-52973?
CVE-2026-52973 is a vulnerability with a CVSS score of 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 strict...
How severe is CVE-2026-52973?
CVE-2026-52973 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-52973?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.