Use-after-free in Linux kernel - CVE-2026-43074

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU130681

Use-after-free in Linux kernel - CVE-2026-43074

Published: May 7, 2026


Vulnerability identifier: #VU130681
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-2026-43074
CWE-ID: CWE-416
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 use-after-free in ep_free() in eventpoll.c when handling concurrent eventpoll operations. A local user can trigger a race condition to cause a denial of service.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
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 Linux Micro
SUSE Linux Micro Extras
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
SUSE Linux Enterprise Live Patching
Public Cloud Module
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
openSUSE Leap
Ubuntu
Anolis OS
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel-livepatch-SLE15-SP6_Update_28-debugsource
kernel-livepatch-6_4_0-150600_23_118-default-debuginfo
kernel-livepatch-6_4_0-150600_23_118-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_66-default-debuginfo
kernel-livepatch-6_4_0-150700_53_66-default
kernel-livepatch-SLE15-SP7_Update_18-debugsource
kernel (Red Hat package)
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-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-default-debugsource
kernel-default-livepatch
kernel-kvmsmall
kernel-source
kernel-default
kernel-devel
kernel-64kb
kernel-syms
kernel-default-devel
kernel-obs-build-debugsource
kernel-obs-build
kernel-64kb-debugsource
kernel-macros
kernel-64kb-devel
kernel-default-devel-debuginfo
kernel-default-base
reiserfs-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
cluster-md-kmp-default
dlm-kmp-default-debuginfo
reiserfs-kmp-default
dlm-kmp-default
gfs2-kmp-default
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-64kb
dtb-sprd
kernel-docs
kernel-default-livepatch-devel
dtb-amd
reiserfs-kmp-64kb
dtb-apple
dtb-freescale
dtb-apm
kernel-64kb-extra
dtb-renesas
ocfs2-kmp-default
kernel-default-extra
ocfs2-kmp-64kb-debuginfo
dtb-rockchip
ocfs2-kmp-64kb
dtb-exynos
dtb-arm
dtb-qcom
kernel-default-optional-debuginfo
kernel-default-extra-debuginfo
kselftests-kmp-default
kernel-default-optional
kernel-obs-qa
kselftests-kmp-default-debuginfo
kernel-64kb-optional-debuginfo
dtb-aarch64
kernel-debug
kernel-debug-devel-debuginfo
kernel-debug-debuginfo
kernel-debug-debugsource
kernel-debug-devel
kernel-default-vdso
kernel-zfcpdump-debuginfo
kernel-kvmsmall-vdso
kernel-debug-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-debug-vdso-debuginfo
kselftests-kmp-64kb
kernel-64kb-extra-debuginfo
kernel-64kb-debuginfo
dtb-lg
dtb-cavium
dtb-amazon
cluster-md-kmp-64kb
dtb-socionext
dtb-xilinx
dlm-kmp-64kb-debuginfo
cluster-md-kmp-64kb-debuginfo
dtb-marvell
dlm-kmp-64kb
dtb-allwinner
kernel-default-vdso-debuginfo
reiserfs-kmp-64kb-debuginfo
dtb-broadcom
kernel-64kb-optional
kselftests-kmp-64kb-debuginfo
dtb-amlogic
dtb-hisilicon
dtb-mediatek
kernel-64kb-devel-debuginfo
dtb-altera
dtb-nvidia
gfs2-kmp-64kb-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-docs-html
kernel-source-vanilla
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-devel
kernel-default-base-rebuild
cluster-md-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-source-rt
kernel-devel-rt
kernel-rt
dlm-kmp-rt
gfs2-kmp-rt-debuginfo
kernel-rt-debuginfo
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
kernel-syms-rt
ocfs2-kmp-rt
kernel-rt-devel-debuginfo
kernel-rt-devel
kernel-azure-debuginfo
kernel-azure
kernel-azure-devel-debuginfo
kernel-azure-debugsource
kernel-azure-devel
bpftool
kernel
kernel-headers
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
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-2026-43074

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE15-SP6_Update_28-debugsource - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150600_23_118-default-debuginfo - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150600_23_118-default - update to 1-150600.13.3.1
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_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 (Red Hat package) - addressed in versions 5.14.0-427.137.1.el9_4, 5.14.0-570.127.1.el9_6, 6.12.0-55.88.1.el10_0, 6.12.0-211.31.1.el10_2, 6.12.0-231.15.el10nv
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-debuginfo - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-kvmsmall-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1
kernel-kvmsmall-debuginfo - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1
kernel-default-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-default-livepatch - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-kvmsmall - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1
kernel-source - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-default - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-devel - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-64kb - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-syms - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-default-devel - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-obs-build - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-64kb-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-macros - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-64kb-devel - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-default-base - addressed in versions 6.4.0-48.1.21.25, 6.4.0-150600.23.118.1.150600.12.56.1, 6.4.0-150700.53.66.1.150700.17.39.1
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
dlm-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-sprd - update to 6.4.0-150600.23.118.1
kernel-docs - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.2
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
dtb-amd - update to 6.4.0-150600.23.118.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-apple - update to 6.4.0-150600.23.118.1
dtb-freescale - update to 6.4.0-150600.23.118.1
dtb-apm - update to 6.4.0-150600.23.118.1
kernel-64kb-extra - update to 6.4.0-150600.23.118.1
dtb-renesas - update to 6.4.0-150600.23.118.1
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
dtb-rockchip - update to 6.4.0-150600.23.118.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-exynos - update to 6.4.0-150600.23.118.1
dtb-arm - update to 6.4.0-150600.23.118.1
dtb-qcom - update to 6.4.0-150600.23.118.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.118.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kselftests-kmp-default - update to 6.4.0-150600.23.118.1
kernel-default-optional - update to 6.4.0-150600.23.118.1
kernel-obs-qa - update to 6.4.0-150600.23.118.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.118.1
dtb-aarch64 - update to 6.4.0-150600.23.118.1
kernel-debug - update to 6.4.0-150600.23.118.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug-debugsource - update to 6.4.0-150600.23.118.1
kernel-debug-devel - update to 6.4.0-150600.23.118.1
kernel-default-vdso - update to 6.4.0-150600.23.118.1
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.118.1
kernel-debug-vdso - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.118.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.118.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.118.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
dtb-lg - update to 6.4.0-150600.23.118.1
dtb-cavium - update to 6.4.0-150600.23.118.1
dtb-amazon - update to 6.4.0-150600.23.118.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-socionext - update to 6.4.0-150600.23.118.1
dtb-xilinx - update to 6.4.0-150600.23.118.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
dtb-marvell - update to 6.4.0-150600.23.118.1
dlm-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-allwinner - update to 6.4.0-150600.23.118.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.118.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
dtb-broadcom - update to 6.4.0-150600.23.118.1
kernel-64kb-optional - update to 6.4.0-150600.23.118.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
dtb-amlogic - update to 6.4.0-150600.23.118.1
dtb-hisilicon - update to 6.4.0-150600.23.118.1
dtb-mediatek - update to 6.4.0-150600.23.118.1
kernel-64kb-devel-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
dtb-altera - update to 6.4.0-150600.23.118.1
dtb-nvidia - update to 6.4.0-150600.23.118.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.66.1
kernel-docs-html - update to 6.4.0-150600.23.118.1
kernel-source-vanilla - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.118.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.118.1.150600.12.56.1
cluster-md-kmp-rt-debuginfo - 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-rt-debugsource - update to 6.4.0-150700.7.62.1
kernel-source-rt - update to 6.4.0-150700.7.62.1
kernel-devel-rt - update to 6.4.0-150700.7.62.1
kernel-rt - update to 6.4.0-150700.7.62.1
dlm-kmp-rt - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-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 - update to 6.4.0-150700.7.62.1
kernel-syms-rt - update to 6.4.0-150700.7.62.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.62.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.62.1
kernel-rt-devel - update to 6.4.0-150700.7.62.1
kernel-azure-debuginfo - 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-devel - update to 6.4.0-150700.53.66.1
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 - 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