Vulnerability · Published Jun 24, 2026 · Assigned by Linux

CVE-2026-52973futex: Drop CLONE_THREAD requirement for private default hash alloc

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 92.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10kernel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-debug6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-debug5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-debug-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-debug-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-abi-stablelists6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-abi-stablelists5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-cross-headers6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-cross-headers5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-devel-matched6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-devel-matched5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-doc6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-doc5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-headers6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-headers5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:10kernel-rt6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-debug6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-debug5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-debug-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-debug-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-tools6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-tools5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-tools-libs6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-tools-libs5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-uki-virt6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-uki-virt5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-zfcpdump6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-zfcpdump5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10libperf6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9libperf5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10perf6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9perf5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10python3-perf6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9python3-perf5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10rtla6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9rtla5.14.0-687.31.1.el9_8ALSA-2026:47040
AlmaLinux:10rv6.12.0-211.39.1.el10_2ALSA-2026:45114
AlmaLinux:9rv5.14.0-687.31.1.el9_8ALSA-2026:47040
Debian:14linux7.0.10-1DEBIAN-CVE-2026-52973
Rocky Linux:10kernel0:6.12.0-211.39.1.el10_2RLSA-2026:45114
Rocky Linux:9kernel0:5.14.0-687.31.1.el9_8RLSA-2026:47040
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-52973
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-52973
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-52973
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-52973
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-52973
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-52973
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-52973
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-52973
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-52973
Ubuntu:26.04:LTSlinux-gcp7.0.0-1008.8UBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-52973
Ubuntu:26.04:LTSlinux-gke7.0.0-1003.4UBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-52973
Ubuntu:26.04:LTSlinux-ibm7.0.0-1010.10UBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-52973
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-52973
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-52973

Affected products (as reported)

VendorProductVersions
Linux Linux d9b05321e21e4b218de4ce8a590bf375f58b6346 – before 1dcd36420af2da5bd59306dba9caf78e3d248b1dd9b05321e21e4b218de4ce8a590bf375f58b6346 – before 974ac49a9a068b0591a59f65c63eb06579a13091d9b05321e21e4b218de4ce8a590bf375f58b6346 – before ee9dce44362b2d8132c32964656ab6dff7dfbc6a
Linux Linux 6.17

Weakness: CWE-825 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References