Double free in Linux kernel - CVE-2026-23239

 

Double free in Linux kernel - CVE-2026-23239

Published: March 10, 2026


Vulnerability identifier: #VU123753
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-2026-23239
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a double free error within the espintcp_close() function in net/xfrm/espintcp.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Live Patching
Development Tools Module
Public Cloud Module
Legacy Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
Ubuntu
kernel-livepatch-5_14_21-150400_24_219-default-debuginfo
kernel-livepatch-SLE15-SP4_Update_54-debugsource
kernel-livepatch-5_14_21-150400_24_219-default
kernel-livepatch-SLE15-SP5_Update_40-debugsource
kernel-livepatch-5_14_21-150500_55_166-default-debuginfo
kernel-livepatch-5_14_21-150500_55_166-default
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource
kernel-livepatch-6_4_0-150700_7_54-rt
kernel-livepatch-6_4_0-150700_53_55-default
kernel-livepatch-SLE15-SP7_Update_15-debugsource
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo
kernel-source-rt
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-rt
dtb-nvidia
dtb-xilinx
dtb-marvell
ocfs2-kmp-64kb-debuginfo
dtb-freescale
dlm-kmp-64kb-debuginfo
dtb-qcom
dtb-sprd
dtb-apm
kernel-64kb-optional-debuginfo
kernel-64kb-devel-debuginfo
dtb-amlogic
kernel-64kb-devel
dlm-kmp-64kb
dtb-cavium
dtb-exynos
dtb-hisilicon
reiserfs-kmp-64kb
dtb-rockchip
kernel-64kb-debuginfo
kernel-64kb
gfs2-kmp-64kb-debuginfo
dtb-arm
reiserfs-kmp-64kb-debuginfo
cluster-md-kmp-64kb
kselftests-kmp-64kb-debuginfo
dtb-amazon
kernel-64kb-extra
dtb-renesas
kernel-64kb-extra-debuginfo
dtb-apple
kernel-64kb-debugsource
cluster-md-kmp-64kb-debuginfo
dtb-mediatek
kernel-64kb-optional
gfs2-kmp-64kb
dtb-socionext
dtb-amd
kselftests-kmp-64kb
dtb-allwinner
kernel-default-debugsource
ocfs2-kmp-default
dlm-kmp-default-debuginfo
kselftests-kmp-default
kernel-syms
kernel-default-optional-debuginfo
reiserfs-kmp-default
kernel-default-devel-debuginfo
kernel-default-debuginfo
kernel-obs-build
kernel-default-extra
kernel-obs-qa
dtb-altera
kernel-kvmsmall-devel
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-source
kernel-docs-html
kernel-macros
kernel-docs
ocfs2-kmp-64kb
kernel-devel
kernel-source-vanilla
gfs2-kmp-default
dtb-lg
dtb-broadcom
dtb-aarch64
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-kvmsmall
kernel-default-livepatch-devel
kernel-default
reiserfs-kmp-default-debuginfo
dlm-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-extra-debuginfo
cluster-md-kmp-default-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-optional
kernel-default-devel
kernel-default-livepatch
cluster-md-kmp-default
kernel-obs-build-debugsource
kernel-default-base-rebuild
kernel-default-base
dlm-kmp-rt-debuginfo
reiserfs-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-rt_debug-debugsource
kselftests-kmp-rt
kernel-rt-optional-debuginfo
kernel-rt-extra-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt-extra
kernel-rt-livepatch-devel
kernel-rt-livepatch
gfs2-kmp-rt
kernel-rt_debug-devel
kernel-rt-devel
kselftests-kmp-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt-optional
kernel-devel-rt
kernel-rt_debug
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-vdso-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-vdso-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-vdso
kernel-rt_debug-debuginfo
cluster-md-kmp-rt
kernel-syms-rt
dlm-kmp-rt
kernel-rt-vdso
gfs2-kmp-rt-debuginfo
kernel-kvmsmall-vdso
kernel-default-vdso-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-default-vdso
kernel-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-azure-devel
linux-nvidia-tegra (Ubuntu package)
linux (Debian package)

How to mitigate CVE-2026-23239

Install update from vendor's repository.

kernel-livepatch-5_14_21-150400_24_219-default-debuginfo - update to 1-150400.9.5.1
kernel-livepatch-SLE15-SP4_Update_54-debugsource - update to 1-150400.9.5.1
kernel-livepatch-5_14_21-150400_24_219-default - update to 1-150400.9.5.1
kernel-livepatch-SLE15-SP5_Update_40-debugsource - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_55_166-default-debuginfo - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_55_166-default - update to 1-150500.11.3.1
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_54-rt - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_55-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_15-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_55-default-debuginfo - update to 1-150700.15.3.1
kernel-source-rt - addressed in versions 5.14.21-150400.15.167.1, 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-debugsource - addressed in versions 5.14.21-150400.15.167.1, 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-debuginfo - addressed in versions 5.14.21-150400.15.167.1, 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt - addressed in versions 5.14.21-150400.15.167.1, 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
dtb-nvidia - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-xilinx - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-marvell - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
ocfs2-kmp-64kb-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-freescale - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dlm-kmp-64kb-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-qcom - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-sprd - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-apm - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-optional-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-devel-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dtb-amlogic - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-devel - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dlm-kmp-64kb - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-cavium - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-exynos - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-hisilicon - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
reiserfs-kmp-64kb - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-rockchip - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-64kb - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
gfs2-kmp-64kb-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-arm - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
reiserfs-kmp-64kb-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
cluster-md-kmp-64kb - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kselftests-kmp-64kb-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-amazon - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-extra - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-renesas - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-extra-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-apple - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-debugsource - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
cluster-md-kmp-64kb-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-mediatek - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-64kb-optional - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
gfs2-kmp-64kb - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-socionext - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-amd - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kselftests-kmp-64kb - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-allwinner - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-default-debugsource - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
ocfs2-kmp-default - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dlm-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kselftests-kmp-default - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-syms - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-optional-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
reiserfs-kmp-default - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-devel-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-obs-build - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-extra - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-obs-qa - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-altera - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-kvmsmall-devel - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-kvmsmall-devel-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-kvmsmall-debugsource - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-kvmsmall-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-source - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-docs-html - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-macros - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-docs - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
ocfs2-kmp-64kb - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-devel - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-source-vanilla - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
gfs2-kmp-default - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dtb-lg - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-broadcom - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-aarch64 - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-zfcpdump-debugsource - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-zfcpdump-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-zfcpdump - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-kvmsmall - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-default-livepatch-devel - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
dlm-kmp-default - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
gfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-extra-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kselftests-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-default-optional - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-default-devel - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-livepatch - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
cluster-md-kmp-default - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-obs-build-debugsource - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1, 6.4.0-150700.53.55.1
kernel-default-base-rebuild - addressed in versions 5.14.21-150400.24.219.1.150400.24.110.2, 5.14.21-150500.55.166.1.150500.6.77.1
kernel-default-base - addressed in versions 5.14.21-150400.24.219.1.150400.24.110.2, 5.14.21-150500.55.166.1.150500.6.77.1, 6.4.0-150700.53.55.1.150700.17.33.1
dlm-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.140.1
cluster-md-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-debugsource - update to 5.14.21-150500.13.140.1
kselftests-kmp-rt - update to 5.14.21-150500.13.140.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.140.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt-extra - update to 5.14.21-150500.13.140.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.140.1
kernel-rt-livepatch - update to 5.14.21-150500.13.140.1
gfs2-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.140.1
kernel-rt-devel - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt-optional - update to 5.14.21-150500.13.140.1
kernel-devel-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug - update to 5.14.21-150500.13.140.1
ocfs2-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.140.1
kernel-rt-devel-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.140.1
ocfs2-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.140.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.140.1
cluster-md-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-syms-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
dlm-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-rt-vdso - update to 5.14.21-150500.13.140.1
gfs2-kmp-rt-debuginfo - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
kernel-kvmsmall-vdso - update to 5.14.21-150500.55.166.1
kernel-default-vdso-debuginfo - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-vdso-debuginfo - update to 5.14.21-150500.55.166.1
kernel-default-vdso - update to 5.14.21-150500.55.166.1
kernel-azure - update to 6.4.0-150700.53.55.1
kernel-azure-debugsource - update to 6.4.0-150700.53.55.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.55.1
kernel-azure-devel - update to 6.4.0-150700.53.55.1
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
linux (Debian package) - update to 6.12.85-1

External References

Related Security Bulletins