Use of Uninitialized Variable in Linux kernel - CVE-2026-43139

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Main Vulnerability Database Vulnerabilities #VU130597

Use of Uninitialized Variable in Linux kernel - CVE-2026-43139

Published: May 7, 2026


Vulnerability identifier: #VU130597
CSH Severity: Low
CVSS v4 BT: 4.3 [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/E:U/U:Clear]
CVE-ID: CVE-2026-43139
CWE-ID: CWE-457
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 use of uninitialized memory in xfrm6_get_saddr() when handling IPv6 source address selection failures. A local user can trigger network operations that cause ipv6_dev_get_saddr() to fail and use the uninitialized address to cause a denial of service.


Affected software

Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 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 Micro Extras
SUSE Linux Micro
SUSE Linux Enterprise Live Patching
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
SUSE Real Time Module
openEuler
Ubuntu
kgraft-patch-4_12_14-122_320-default
kernel-livepatch-6_4_0-150700_7_62-rt
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo
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-default-base-debuginfo
dlm-kmp-default-debuginfo
kernel-default-debugsource
kernel-default-base
kernel-default-devel
kernel-source
kernel-macros
kernel-devel
kernel-default-man
kernel-default-kgraft
kernel-default-kgraft-devel
cluster-md-kmp-default-debuginfo
dlm-kmp-default
kernel-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
bpftool
kernel
kernel-tools-debuginfo
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo
perf
kernel-tools-devel
kernel-tools
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel-headers
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-default-livepatch
kernel-kvmsmall
kernel-rt-devel-debuginfo
kernel-rt-devel
kernel-rt-debugsource
kernel-rt
kernel-64kb
kernel-devel-rt
kernel-source-rt
kernel-rt-debuginfo
kernel-rt-livepatch
kernel-64kb-debugsource
kernel-64kb-devel
kernel-obs-build
kernel-obs-build-debugsource
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
ocfs2-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
gfs2-kmp-rt-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt
ocfs2-kmp-rt-debuginfo
reiserfs-kmp-default-debuginfo
kernel-zfcpdump
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-default-extra-debuginfo
reiserfs-kmp-default
kernel-zfcpdump-debugsource
kernel-azure
kernel-azure-devel-debuginfo
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
kernel-default-extra
kernel-default-livepatch-devel
kernel-zfcpdump-debuginfo
kernel-docs
linux-hwe-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)

How to mitigate CVE-2026-43139

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kgraft-patch-4_12_14-122_320-default - update to 1-8.3.1
kernel-livepatch-6_4_0-150700_7_62-rt - 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-debuginfo - 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-default-base-debuginfo - update to 4.12.14-122.320.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
kernel-default-debugsource - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-default-base - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1.150700.17.39.1
kernel-default-devel - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-source - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-macros - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-devel - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-default-man - update to 4.12.14-122.320.1
kernel-default-kgraft - update to 4.12.14-122.320.1
kernel-default-kgraft-devel - update to 4.12.14-122.320.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
dlm-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
gfs2-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
kernel-syms - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-150700.53.66.1
kernel-default - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.320.1, 6.4.0-49.1, 6.4.0-150700.53.66.1
bpftool - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-tools-debuginfo - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
perf-debuginfo - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
python2-perf - update to 4.19.90-2606.1.0.0375
python2-perf-debuginfo - update to 4.19.90-2606.1.0.0375
python3-perf - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
python3-perf-debuginfo - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
perf - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-tools-devel - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-tools - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-source - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-devel - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-debugsource - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-debuginfo - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
bpftool-debuginfo - addressed in versions 4.19.90-2606.1.0.0375, 5.10.0-318.0.0.221
kernel-headers - update to 5.10.0-318.0.0.221
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, 6.8.0-134.134, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61+fips1, 6.8.0-1058.61~22.04.1, 6.8.0-1060.61, 6.8.0-1060.63+fips1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69, 6.8.0-1063.69+fips1, 6.8.1-1055.56, 6.8.1-1055.56~22.04.1
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
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, 6.8.0-1029.30
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1106.110~20.04.1
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, 6.8.0-134.134+fips1, 6.8.0-1062.69+fips1
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1117.126, 6.8.0-1062.69
kernel-kvmsmall-debugsource - update to 6.4.0-49.1
kernel-kvmsmall-debuginfo - update to 6.4.0-49.1
kernel-default-livepatch - 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-rt-devel-debuginfo - 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-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-rt - addressed in versions 6.4.0-49.1, 6.4.0-150700.7.62.1
kernel-64kb - 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-obs-build-debugsource - addressed in versions 6.4.0-49.1, 6.4.0-150700.53.66.1
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
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
kernel-syms-rt - 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
cluster-md-kmp-rt - update to 6.4.0-150700.7.62.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
kernel-zfcpdump - update to 6.4.0-150700.53.66.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.66.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.66.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.66.1
reiserfs-kmp-default - update to 6.4.0-150700.53.66.1
kernel-zfcpdump-debugsource - 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 - update to 6.4.0-150700.53.66.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.66.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.66.1
kernel-docs - update to 6.4.0-150700.53.66.2
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1045.48, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61.1, 6.8.0-1058.64, 6.8.0-1060.61~22.04.1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69~22.04.1
linux-raspi (Ubuntu package) - update to 6.8.0-1060.64
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2049.50

External References

Related Security Bulletins