Race condition in Linux kernel - CVE-2026-43420

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Main Vulnerability Database Vulnerabilities #VU130753

Race condition in Linux kernel - CVE-2026-43420

Published: May 8, 2026


Vulnerability identifier: #VU130753
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-43420
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 ceph_unlink() when processing asynchronous unlink operations. A local user can trigger concurrent unlink completion handling to cause a denial of service.

Only the asynchronous unlink code path is affected.


Affected software

Linux kernel
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Micro Extras
SUSE Linux Micro
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
Ubuntu
Anolis OS
openEuler
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource
kernel-livepatch-6_4_0-150700_7_62-rt
kernel-livepatch-6_4_0-150700_53_66-default-debuginfo
kernel-livepatch-6_4_0-150700_53_66-default
kernel-livepatch-SLE15-SP7_Update_18-debugsource
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
kernel-default
kernel-rt
kernel-rt-debugsource
kernel-rt-devel
kernel-rt-devel-debuginfo
kernel-kvmsmall
kernel-default-debugsource
kernel-default-debuginfo
kernel-devel
kernel-devel-rt
kernel-source-rt
kernel-rt-debuginfo
kernel-rt-livepatch
kernel-64kb-debugsource
kernel-64kb-devel
kernel-obs-build
kernel-default-devel
kernel-obs-build-debugsource
kernel-syms
kernel-default-livepatch
kernel-macros
kernel-source
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-default-devel-debuginfo
kernel-64kb
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-syms-rt
gfs2-kmp-rt
ocfs2-kmp-rt
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
dlm-kmp-rt
kernel-default-livepatch-devel
kernel-azure
kernel-azure-devel-debuginfo
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
kernel-default-extra-debuginfo
kernel-default-extra
kernel-64kb-debuginfo
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default
cluster-md-kmp-default
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-64kb-devel-debuginfo
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-default-base
kernel-docs
python3-perf
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf-debuginfo
bpftool
kernel
kernel-extra-modules
kernel-tools-libs
kernel-debug
kernel-debug-devel
kernel-tools-libs-devel
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-azure-fde-6.8 (Ubuntu package)
linux-gcp-fips (Ubuntu package)

How to mitigate CVE-2026-43420

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_62-rt - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_66-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_66-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_18-debugsource - update to 1-150700.15.3.1
linux (Ubuntu package) - addressed in versions 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 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
linux-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 6.8.0-1061.64+1
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1106.110~20.04.1
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 6.8.0-1063.71, 6.8.0-1063.71~22.04.1
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1, 6.8.0-1063.71+fips2
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1117.126, 6.8.0-1062.69
kernel-default - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-devel - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-devel-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-kvmsmall - update to 6.4.0-49.1
kernel-default-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-default-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-devel - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-devel-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-source-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt-livepatch - update to 6.4.0-49.1
kernel-64kb-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-64kb-devel - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-obs-build - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-default-devel - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-syms - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-default-livepatch - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-macros - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-source - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-kvmsmall-debuginfo - update to 6.4.0-49.1
kernel-kvmsmall-debugsource - update to 6.4.0-49.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-64kb - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.62.1
kernel-syms-rt - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt - update to 6.4.0-150700.7.62.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
dlm-kmp-rt - update to 6.4.0-150700.7.62.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.66.1
kernel-azure - update to 6.4.0-150700.53.66.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.66.1
kernel-azure-debugsource - update to 6.4.0-150700.53.66.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.66.1
kernel-azure-devel - update to 6.4.0-150700.53.66.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.66.1
kernel-default-extra - update to 6.4.0-150700.53.66.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.66.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
ocfs2-kmp-default - update to 6.4.0-150700.53.66.1
reiserfs-kmp-default - update to 6.4.0-150700.53.66.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
gfs2-kmp-default - update to 6.4.0-150700.53.66.1
dlm-kmp-default - update to 6.4.0-150700.53.66.1
cluster-md-kmp-default - update to 6.4.0-150700.53.66.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.66.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.66.1
kernel-zfcpdump - update to 6.4.0-150700.53.66.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.66.1
kernel-default-base - update to 6.4.0-150700.53.66.1.150700.17.39.1
kernel-docs - update to 6.4.0-150700.53.66.2
python3-perf - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
bpftool-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-debugsource - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-devel - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-headers - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-source - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-tools-devel - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
perf - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
perf-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
python3-perf-debuginfo - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
bpftool - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel - addressed in versions 6.6.0-145.0.10.137, 6.6.0-145.0.10.141, 6.6.0-145.0.10.149
kernel-extra-modules - update to 6.6.0-145.0.10.141
kernel-tools-libs - update to 6.6.102-6
bpftool - update to 6.6.102-6
kernel - update to 6.6.102-6
kernel-debug - update to 6.6.102-6
kernel-debug-devel - update to 6.6.102-6
kernel-devel - update to 6.6.102-6
kernel-headers - update to 6.6.102-6
kernel-tools - update to 6.6.102-6
kernel-tools-libs-devel - update to 6.6.102-6
perf - update to 6.6.102-6
python3-perf - update to 6.6.102-6
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
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
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1

External References

Related Security Bulletins