Race condition in Linux kernel - CVE-2026-52977

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Main Vulnerability Database Vulnerabilities #VU135397

Race condition in Linux kernel - CVE-2026-52977

Published: June 25, 2026


Vulnerability identifier: #VU135397
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-52977
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in futex requeue-PI handling in kernel/futex/requeue.c when processing wait-requeue-pi and requeue-PI operations during signal or timeout wakeup. A local user can trigger concurrent futex operations to cause a denial of service.

The issue can result in a live lock where one task blocks on a hash bucket lock while another busy loops, potentially locking up the system.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
openSUSE Leap
Ubuntu
kernel-livepatch-SLE15-SP4_Update_59-debugsource
kernel-livepatch-5_14_21-150400_24_240-default
kernel-livepatch-5_14_21-150400_24_240-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_31-debugsource
kernel-livepatch-6_4_0-150600_23_135-default-debuginfo
kernel-livepatch-6_4_0-150600_23_135-default
kernel-livepatch-6_4_0-150700_53_81-default
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_21-debugsource
kernel-source-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-rt
kernel-docs
kernel-devel
kernel-macros
kernel-source
kernel-obs-build-debugsource
kernel-syms
kernel-obs-build
kernel-default-debugsource
kernel-default-debuginfo
reiserfs-kmp-default-debuginfo
kernel-default-devel
reiserfs-kmp-default
kernel-default
kernel-default-devel-debuginfo
kernel-64kb-debugsource
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-default-livepatch-devel
kernel-default-livepatch
cluster-md-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
cluster-md-kmp-default
dlm-kmp-default
ocfs2-kmp-default
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
dlm-kmp-default-debuginfo
kernel-64kb-devel
kernel-64kb
kernel-default-base
ocfs2-kmp-rt
kselftests-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-syms-rt
kernel-rt-devel
kernel-rt-livepatch-devel
kernel-rt-extra-debuginfo
reiserfs-kmp-rt
kselftests-kmp-rt-debuginfo
dlm-kmp-rt
gfs2-kmp-rt
kernel-rt-vdso
gfs2-kmp-rt-debuginfo
kernel-rt-livepatch
kernel-rt_debug
kernel-devel-rt
kernel-rt_debug-debugsource
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-debuginfo
kernel-rt-extra
kernel-rt_debug-vdso
kernel-rt-vdso-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt_debug-vdso-debuginfo
kernel-rt-devel-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-optional
cluster-md-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt-optional-debuginfo
kernel-rt_debug-devel
kernel-default-optional-debuginfo
kernel-64kb-optional
gfs2-kmp-64kb-debuginfo
kselftests-kmp-default
kernel-default-optional
kernel-default-extra
kselftests-kmp-default-debuginfo
cluster-md-kmp-64kb-debuginfo
kernel-obs-qa
kernel-64kb-optional-debuginfo
cluster-md-kmp-64kb
kselftests-kmp-64kb
ocfs2-kmp-64kb
kernel-64kb-extra-debuginfo
kernel-kvmsmall-vdso
kernel-64kb-extra
reiserfs-kmp-64kb-debuginfo
dlm-kmp-64kb
kernel-debug-vdso
kernel-kvmsmall
kernel-source-vanilla
kernel-docs-html
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel
kernel-default-extra-debuginfo
kernel-default-vdso-debuginfo
kernel-default-vdso
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-debug-debuginfo
kernel-debug-devel
kernel-debug-debugsource
kernel-debug-devel-debuginfo
kernel-debug
dlm-kmp-64kb-debuginfo
ocfs2-kmp-64kb-debuginfo
kselftests-kmp-64kb-debuginfo
gfs2-kmp-64kb
reiserfs-kmp-64kb
kernel-default-base-rebuild
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-aws (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

How to mitigate CVE-2026-52977

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE15-SP4_Update_59-debugsource - update to 1-150400.9.5.1
kernel-livepatch-5_14_21-150400_24_240-default - update to 1-150400.9.5.1
kernel-livepatch-5_14_21-150400_24_240-default-debuginfo - update to 1-150400.9.5.1
kernel-livepatch-SLE15-SP6_Update_31-debugsource - update to 1-150600.13.3.4
kernel-livepatch-6_4_0-150600_23_135-default-debuginfo - update to 1-150600.13.3.4
kernel-livepatch-6_4_0-150600_23_135-default - update to 1-150600.13.3.4
kernel-livepatch-6_4_0-150700_53_81-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_21-debugsource - update to 1-150700.15.3.1
kernel-source-rt - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt-debuginfo - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt-debugsource - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-docs - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-devel - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-macros - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-source - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-obs-build-debugsource - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-syms - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-obs-build - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
reiserfs-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-devel-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-zfcpdump-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-zfcpdump-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-zfcpdump - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-livepatch-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-livepatch - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
gfs2-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
gfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
cluster-md-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
dlm-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
ocfs2-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-devel-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
dlm-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-64kb - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-base - addressed in versions 5.14.21-150400.24.240.2.150400.24.120.2, 6.4.0-150600.23.135.1.150600.12.62.4, 6.4.0-150700.53.81.1.150700.17.45.1
ocfs2-kmp-rt - update to 5.14.21-150500.13.161.1
kselftests-kmp-rt - update to 5.14.21-150500.13.161.1
ocfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-syms-rt - update to 5.14.21-150500.13.161.1
kernel-rt-devel - update to 5.14.21-150500.13.161.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.161.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.161.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.161.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
dlm-kmp-rt - update to 5.14.21-150500.13.161.1
gfs2-kmp-rt - update to 5.14.21-150500.13.161.1
kernel-rt-vdso - update to 5.14.21-150500.13.161.1
gfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-livepatch - update to 5.14.21-150500.13.161.1
kernel-rt_debug - update to 5.14.21-150500.13.161.1
kernel-devel-rt - update to 5.14.21-150500.13.161.1
kernel-rt_debug-debugsource - update to 5.14.21-150500.13.161.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-extra - update to 5.14.21-150500.13.161.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.161.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.161.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-devel-debuginfo - update to 5.14.21-150500.13.161.1
cluster-md-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-optional - update to 5.14.21-150500.13.161.1
cluster-md-kmp-rt - update to 5.14.21-150500.13.161.1
dlm-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.161.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.135.1
kernel-64kb-optional - update to 6.4.0-150600.23.135.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kselftests-kmp-default - update to 6.4.0-150600.23.135.1
kernel-default-optional - update to 6.4.0-150600.23.135.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.135.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kernel-obs-qa - update to 6.4.0-150600.23.135.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.135.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.135.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.135.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.135.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.135.1
kernel-64kb-extra - update to 6.4.0-150600.23.135.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
dlm-kmp-64kb - update to 6.4.0-150600.23.135.1
kernel-debug-vdso - update to 6.4.0-150600.23.135.1
kernel-kvmsmall - update to 6.4.0-150600.23.135.1
kernel-source-vanilla - update to 6.4.0-150600.23.135.1
kernel-docs-html - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.135.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.135.1, 6.4.0-150700.53.81.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-default-vdso - update to 6.4.0-150600.23.135.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug-devel - update to 6.4.0-150600.23.135.1
kernel-debug-debugsource - update to 6.4.0-150600.23.135.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug - update to 6.4.0-150600.23.135.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.135.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.135.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.135.1.150600.12.62.4
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-debugsource - update to 6.4.0-150700.53.81.1
kernel-azure-devel - update to 6.4.0-150700.53.81.1
kernel-azure - update to 6.4.0-150700.53.81.1
linux (Ubuntu package) - addressed in versions 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-28.28, 7.0.0-28.28.1, 7.0.0-1003.4, 7.0.0-1008.8
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1, 7.0.0-1008.8, 7.0.0-1010.10
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1, 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-aws (Ubuntu package) - addressed in versions 6.8.0-1061.64+1, 7.0.0-1009.9, 7.0.0-1015.15
linux-raspi (Ubuntu package) - addressed in versions 6.8.0-1061.65, 6.8.0-2050.52
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1009.9
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

External References

Related Security Bulletins