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CVE-2026-52973 is a use-after-free vulnerability in the Linux kernel's private default futex hash allocation. The need_futex_hash_allocate_default() function relies on CLONE_THREAD to identify shared-address-space concurrency. Processes sharing an address space through other CLONE_VM arrangements can violate the allocation path's non-concurrency assumptions. Competing per-CPU reference-counter allocations can leave the +1 reference-count bias on a counter no longer referenced by mm->futex_ref, resulting in a slab use-after-free in futex_hash_put. The correction broadens the allocation check to CLONE_VM clones while retaining an exemption for vfork().
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A Linux kernel futex use-after-free vulnerability caused by incorrect assumptions about memory sharing during per-CPU reference-counter allocation. The fix broadens the allocation check to cover CLONE_VM clones while excluding vfork(). The reference assigns a CVSS v3 base score of 7.0, indicating local access, low privileges, high attack complexity, and potentially high confidentiality, integrity, and availability impacts.
A Linux kernel futex vulnerability concerning the CLONE_THREAD requirement for private default hash allocation, affecting Rocky Linux 9 kernel packages.
A Linux kernel futex issue concerning the CLONE_THREAD requirement for private default hash allocation, affecting Rocky Linux 10.2 kernel packages.
A Linux kernel futex vulnerability involving the CLONE_THREAD requirement for private default hash allocation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.