High severity7.8NVD Advisory· Published Jun 24, 2026· Updated Jul 29, 2026
CVE-2026-52973
CVE-2026-52973
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
83cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 6 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.17.1,<6.18.33
- cpe:2.3:o:linux:linux_kernel:6.17:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc7:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
- (no CPE)
- osv-coords76 versionspkg:linux/kernelpkg:rpm/almalinux/kernelpkg:rpm/almalinux/kernel-64kpkg:rpm/almalinux/kernel-64k-corepkg:rpm/almalinux/kernel-64k-debugpkg:rpm/almalinux/kernel-64k-debug-corepkg:rpm/almalinux/kernel-64k-debug-develpkg:rpm/almalinux/kernel-64k-debug-devel-matchedpkg:rpm/almalinux/kernel-64k-debug-modulespkg:rpm/almalinux/kernel-64k-debug-modules-corepkg:rpm/almalinux/kernel-64k-debug-modules-extrapkg:rpm/almalinux/kernel-64k-develpkg:rpm/almalinux/kernel-64k-devel-matchedpkg:rpm/almalinux/kernel-64k-modulespkg:rpm/almalinux/kernel-64k-modules-corepkg:rpm/almalinux/kernel-64k-modules-extrapkg:rpm/almalinux/kernel-abi-stablelistspkg:rpm/almalinux/kernel-corepkg:rpm/almalinux/kernel-cross-headerspkg:rpm/almalinux/kernel-debugpkg:rpm/almalinux/kernel-debug-corepkg:rpm/almalinux/kernel-debug-develpkg:rpm/almalinux/kernel-debug-devel-matchedpkg:rpm/almalinux/kernel-debug-modulespkg:rpm/almalinux/kernel-debug-modules-corepkg:rpm/almalinux/kernel-debug-modules-extrapkg:rpm/almalinux/kernel-debug-uki-virtpkg:rpm/almalinux/kernel-develpkg:rpm/almalinux/kernel-devel-matchedpkg:rpm/almalinux/kernel-docpkg:rpm/almalinux/kernel-headerspkg:rpm/almalinux/kernel-modulespkg:rpm/almalinux/kernel-modules-corepkg:rpm/almalinux/kernel-modules-extrapkg:rpm/almalinux/kernel-modules-extra-matchedpkg:rpm/almalinux/kernel-rtpkg:rpm/almalinux/kernel-rt-64kpkg:rpm/almalinux/kernel-rt-64k-corepkg:rpm/almalinux/kernel-rt-64k-debugpkg:rpm/almalinux/kernel-rt-64k-debug-corepkg:rpm/almalinux/kernel-rt-64k-debug-develpkg:rpm/almalinux/kernel-rt-64k-debug-modulespkg:rpm/almalinux/kernel-rt-64k-debug-modules-corepkg:rpm/almalinux/kernel-rt-64k-debug-modules-extrapkg:rpm/almalinux/kernel-rt-64k-develpkg:rpm/almalinux/kernel-rt-64k-modulespkg:rpm/almalinux/kernel-rt-64k-modules-corepkg:rpm/almalinux/kernel-rt-64k-modules-extrapkg:rpm/almalinux/kernel-rt-corepkg:rpm/almalinux/kernel-rt-debugpkg:rpm/almalinux/kernel-rt-debug-corepkg:rpm/almalinux/kernel-rt-debug-develpkg:rpm/almalinux/kernel-rt-debug-modulespkg:rpm/almalinux/kernel-rt-debug-modules-corepkg:rpm/almalinux/kernel-rt-debug-modules-extrapkg:rpm/almalinux/kernel-rt-develpkg:rpm/almalinux/kernel-rt-modulespkg:rpm/almalinux/kernel-rt-modules-corepkg:rpm/almalinux/kernel-rt-modules-extrapkg:rpm/almalinux/kernel-toolspkg:rpm/almalinux/kernel-tools-libspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/almalinux/kernel-uki-virtpkg:rpm/almalinux/kernel-uki-virt-addonspkg:rpm/almalinux/kernel-zfcpdumppkg:rpm/almalinux/kernel-zfcpdump-corepkg:rpm/almalinux/kernel-zfcpdump-develpkg:rpm/almalinux/kernel-zfcpdump-devel-matchedpkg:rpm/almalinux/kernel-zfcpdump-modulespkg:rpm/almalinux/kernel-zfcpdump-modules-corepkg:rpm/almalinux/kernel-zfcpdump-modules-extrapkg:rpm/almalinux/libperfpkg:rpm/almalinux/perfpkg:rpm/almalinux/python3-perfpkg:rpm/almalinux/rtlapkg:rpm/almalinux/rv
>= 6.17.0, < 6.18.33+ 75 more
- (no CPE)range: >= 6.17.0, < 6.18.33
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
- (no CPE)range: < 6.12.0-211.39.1.el10_2
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1dnvdPatch
- git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091nvdPatch
- git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6anvdPatch
- access.redhat.com/security/cve/CVE-2026-52973nvdThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52973.jsonnvdThird Party Advisory
- access.redhat.com/errata/RHSA-2026:45114nvd
- access.redhat.com/errata/RHSA-2026:47040nvd
News mentions
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