Race condition in Linux kernel - CVE-2026-31450

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Main Vulnerability Database Vulnerabilities #VU127694

Race condition in Linux kernel - CVE-2026-31450

Published: April 24, 2026


Vulnerability identifier: #VU127694
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-2026-31450
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 ext4_inode_attach_jinode() when handling concurrent fast commit flush operations. A local user can trigger concurrent filesystem activity to cause a denial of service.

The issue occurs because a jinode pointer may be observed as non-NULL before its associated i_vfs_inode field is initialized, leading to a kernel crash when the fast commit flush path dereferences it.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Micro
SUSE Linux Micro Extras
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
openEuler
Ubuntu
Anolis OS
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
kernel-tools
kernel-source
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-headers
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)
linux (Debian package)
kernel-default-devel
kernel-64kb
kernel-default
kernel-rt-livepatch
kernel-default-debugsource
kernel-rt-debuginfo
kernel-syms
kernel-obs-build-debugsource
kernel-source-rt
kernel-obs-build
kernel-devel-rt
kernel-64kb-devel
kernel-64kb-debugsource
kernel-rt
kernel-rt-debugsource
kernel-default-devel-debuginfo
kernel-kvmsmall
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-macros
kernel-default-livepatch
kernel-default-debuginfo
kernel-rt-devel
kernel-rt-devel-debuginfo
dlm-kmp-rt
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-syms-rt
cluster-md-kmp-rt-debuginfo
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-azure
kernel-azure-devel-debuginfo
dlm-kmp-default
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
kernel-default-extra-debuginfo
kernel-default-extra
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-default
cluster-md-kmp-default
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-default-livepatch-devel
kernel-default-base
kernel-docs
kernel-extra-modules
kernel-debug
kernel-debug-devel
kernel-tools-libs
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-2026-31450

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
kernel-tools - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel-source - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel-devel - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel-debugsource - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel-debuginfo - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
bpftool-debuginfo - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
bpftool - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel-tools-debuginfo - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel-tools-devel - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
perf - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
perf-debuginfo - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
python2-perf - update to 4.19.90-2605.2.0.0371
python2-perf-debuginfo - update to 4.19.90-2605.2.0.0371
python3-perf - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
python3-perf-debuginfo - addressed in versions 4.19.90-2605.2.0.0371, 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
kernel-headers - addressed in versions 5.10.0-313.0.0.216, 6.6.0-145.1.14.152, 6.6.0-145.3.14.145
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
linux (Debian package) - addressed in versions 6.1.170-1, 6.12.85-1
kernel-default-devel - 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
kernel-default - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-rt-livepatch - 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-rt-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-syms - 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-source-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-obs-build - 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-64kb-devel - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-64kb-debugsource - 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-default-devel-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-kvmsmall - update to 6.4.0-49.1
kernel-kvmsmall-debugsource - update to 6.4.0-49.1
kernel-kvmsmall-debuginfo - update to 6.4.0-49.1
kernel-source - 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-devel - 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-default-debuginfo - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
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
dlm-kmp-rt - update to 6.4.0-150700.7.62.1
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
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt - 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
ocfs2-kmp-rt - update to 6.4.0-150700.7.62.1
kernel-azure - update to 6.4.0-150700.53.66.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.66.1
dlm-kmp-default - 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
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
reiserfs-kmp-default - update to 6.4.0-150700.53.66.1
ocfs2-kmp-default - 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-debuginfo - update to 6.4.0-150700.53.66.1
gfs2-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-64kb-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-zfcpdump-debuginfo - update to 6.4.0-150700.53.66.1
kernel-default-livepatch-devel - 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
kernel-extra-modules - update to 6.6.0-145.3.14.145
kernel-headers - 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-tools - update to 6.6.102-6
kernel-tools-libs - 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

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