Improper locking in Linux kernel - CVE-2026-31592

Vulnerability identifier: #VU127806

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-2026-31592

CWE-ID: CWE-667

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper locking in sev_mem_enc_register_region() when handling KVM ioctls during SEV guest initialization failure paths. A local user can issue crafted ioctl calls to trigger a general protection fault and kernel crash.

The issue can occur if KVM_SEV_INIT{2} fails and KVM attempts to add to an uninitialized sev->regions_list.

Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
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 High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Micro
SUSE Linux Micro Extras
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Public Cloud Module
Legacy Module
Development Tools Module
openEuler
Ubuntu
kgraft-patch-4_12_14-122_320-default
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_63-default
kernel-livepatch-6_4_0-150700_53_63-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_17-debugsource
kernel-source
kernel-default-kgraft
kernel-default-man
kernel-devel
kernel-macros
dlm-kmp-default
kernel-default-devel
kernel-default-base
kernel-default-debugsource
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-kgraft-devel
kernel-default-debuginfo
dlm-kmp-default-debuginfo
ocfs2-kmp-default
gfs2-kmp-default
ocfs2-kmp-default-debuginfo
kernel-syms
cluster-md-kmp-default
gfs2-kmp-default-debuginfo
kernel-default
kernel-default-devel-debuginfo
kernel
bpftool
python3-perf
python3-perf-debuginfo
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
kernel-obs-build-debugsource
kernel-obs-build
kernel-64kb-debugsource
kernel-64kb-devel
kernel-kvmsmall
kernel-default-livepatch
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-64kb
ocfs2-kmp-rt-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-syms-rt
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
ocfs2-kmp-rt
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-rt
kernel-devel-rt
kernel-source-rt
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
reiserfs-kmp-default
kernel-default-livepatch-devel
reiserfs-kmp-default-debuginfo
kernel-azure-devel-debuginfo
kernel-azure-devel
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure
kernel-docs
kernel-default-extra-debuginfo
kernel-default-extra
kernel-zfcpdump
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

Install security update from vendor's repository.

kgraft-patch-4_12_14-122_320-default - update to 1-8.3.1
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_63-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_63-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_17-debugsource - update to 1-150700.15.3.1
kernel-source - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default-kgraft - update to 4.12.14-122.320.1
kernel-default-man - update to 4.12.14-122.320.1
kernel-devel - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-macros - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
dlm-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
kernel-default-devel - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default-base - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1.21.25, 6.4.0-150700.53.63.1.150700.17.37.1
kernel-default-debugsource - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default-base-debuginfo - update to 4.12.14-122.320.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
kernel-default-kgraft-devel - update to 4.12.14-122.320.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
gfs2-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
kernel-syms - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.63.1
kernel-default - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel - update to 5.10.0-314.0.0.217
bpftool - update to 5.10.0-314.0.0.217
python3-perf - update to 5.10.0-314.0.0.217
python3-perf-debuginfo - update to 5.10.0-314.0.0.217
bpftool-debuginfo - update to 5.10.0-314.0.0.217
kernel-debuginfo - update to 5.10.0-314.0.0.217
kernel-debugsource - update to 5.10.0-314.0.0.217
kernel-devel - update to 5.10.0-314.0.0.217
kernel-headers - update to 5.10.0-314.0.0.217
kernel-source - update to 5.10.0-314.0.0.217
kernel-tools - update to 5.10.0-314.0.0.217
kernel-tools-debuginfo - update to 5.10.0-314.0.0.217
kernel-tools-devel - update to 5.10.0-314.0.0.217
perf - update to 5.10.0-314.0.0.217
perf-debuginfo - update to 5.10.0-314.0.0.217
kernel-obs-build-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-obs-build - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-64kb-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-64kb-devel - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-kvmsmall - update to 6.4.0-48.1
kernel-default-livepatch - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-kvmsmall-debuginfo - update to 6.4.0-48.1
kernel-kvmsmall-debugsource - update to 6.4.0-48.1
kernel-64kb - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
dlm-kmp-rt - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.62.1
kernel-rt-debugsource - update to 6.4.0-150700.7.62.1
kernel-syms-rt - update to 6.4.0-150700.7.62.1
kernel-rt-devel - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.62.1
ocfs2-kmp-rt - 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
kernel-rt-debuginfo - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-rt - update to 6.4.0-150700.7.62.1
kernel-devel-rt - update to 6.4.0-150700.7.62.1
kernel-source-rt - update to 6.4.0-150700.7.62.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.63.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.63.1
reiserfs-kmp-default - update to 6.4.0-150700.53.63.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.63.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.63.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.63.1
kernel-azure-devel - update to 6.4.0-150700.53.63.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.63.1
kernel-azure-debugsource - update to 6.4.0-150700.53.63.1
kernel-azure - update to 6.4.0-150700.53.63.1
kernel-docs - update to 6.4.0-150700.53.63.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.63.1
kernel-default-extra - update to 6.4.0-150700.53.63.1
kernel-zfcpdump - update to 6.4.0-150700.53.63.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.63.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.63.1
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

• https://git.kernel.org/stable/c/0ff93ff0ba82e9511770e175fa50682a1ab14fb6
• https://git.kernel.org/stable/c/35a0963d361f98bba798fd15d229dcb166c04684
• https://git.kernel.org/stable/c/ab725ac3022469ecd4d7aa7d5646712e98b249d8

• Improper locking in Linux kernel kvm svm
• openEuler 22.03 LTS SP4 update for kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-nvidia
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-azure