Double free in Linux kernel - CVE-2026-23239

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

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.

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

Install update from vendor's repository.

kernel-livepatch-5_14_21-150400_24_219-default - 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-debuginfo - 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 - 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-debuginfo - 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-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-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
dtb-sprd - 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
dtb-apple - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
dtb-nvidia - 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-mediatek - 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-amazon - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
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-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-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
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
gfs2-kmp-64kb - 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
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-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-rockchip - 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
kernel-64kb-optional - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kernel-default-optional-debuginfo - 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-optional - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
kselftests-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
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
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
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
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
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-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
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
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
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 - 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-xilinx - addressed in versions 5.14.21-150400.24.219.1, 5.14.21-150500.55.166.1
ocfs2-kmp-64kb - 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
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-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-source-vanilla - 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-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
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
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-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
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-rt-livepatch-devel - 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-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-devel-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
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-extra - update to 5.14.21-150500.13.140.1
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
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
kernel-rt-optional-debuginfo - 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
ocfs2-kmp-rt - addressed in versions 5.14.21-150500.13.140.1, 6.4.0-150700.7.54.1
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
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-rt_debug-vdso - update to 5.14.21-150500.13.140.1
kernel-default-vdso-debuginfo - update to 5.14.21-150500.55.166.1
kernel-kvmsmall-vdso - 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 (Debian package) - update to 6.12.85-1

• https://git.kernel.org/stable/c/022ff7f347588de6e17879a1da6019647b21321b
• https://git.kernel.org/stable/c/664e9df53226b4505a0894817ecad2c610ab11d8
• https://git.kernel.org/stable/c/e1512c1db9e8794d8d130addd2615ec27231d994
• https://git.kernel.org/stable/c/f7ad8b1d0e421c524604d5076b73232093490d5c

• Double free in Linux kernel xfrm
• Debian update for linux
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel