Race condition in Linux kernel - CVE-2026-43023

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Main Vulnerability Database Vulnerabilities #VU128892

Race condition in Linux kernel - CVE-2026-43023

Published: May 2, 2026


Vulnerability identifier: #VU128892
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-2026-43023
CWE-ID: CWE-362
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 race condition leading to use-after-free in sco_sock_connect() when handling concurrent connect() calls on the same Bluetooth SCO socket. A local user can issue concurrent connect() syscalls on the same socket to cause a denial of service.

The issue can revive a BT_CLOSED and SOCK_ZAPPED socket back to BT_CONNECT during concurrent execution.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
Debian Linux
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 for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
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
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
openSUSE Leap
Ubuntu
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
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_63-default-debuginfo
kernel-livepatch-6_4_0-150700_53_63-default
kernel-livepatch-SLE15-SP7_Update_17-debugsource
kernel (Red Hat package)
linux (Debian package)
kernel-64kb-debugsource
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel
kernel-64kb
kernel-default
kernel-default-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-default-livepatch
kernel-kvmsmall
kernel-source
kernel-devel
kernel-macros
kernel-64kb-devel
kernel-default-debuginfo
kernel-default-base
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-debug
dtb-aarch64
kernel-default-extra
kselftests-kmp-default-debuginfo
kernel-obs-qa
kernel-default-optional
kselftests-kmp-default
kernel-default-extra-debuginfo
kernel-default-optional-debuginfo
dtb-qcom
dtb-arm
dtb-exynos
kernel-kvmsmall-devel-debuginfo
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-docs-html
kernel-source-vanilla
kernel-kvmsmall-devel
kernel-debug-devel
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-debug-vdso
kernel-kvmsmall-vdso
kernel-default-vdso-debuginfo
kernel-default-vdso
dtb-renesas
kernel-64kb-extra
dtb-apm
dtb-sprd
dtb-freescale
dtb-apple
reiserfs-kmp-64kb
dtb-amd
kernel-default-livepatch-devel
kernel-docs
dtb-rockchip
ocfs2-kmp-default
gfs2-kmp-default
reiserfs-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
cluster-md-kmp-default
dlm-kmp-default-debuginfo
reiserfs-kmp-default
dlm-kmp-default
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-64kb-extra-debuginfo
cluster-md-kmp-64kb
dtb-socionext
dtb-xilinx
dlm-kmp-64kb-debuginfo
cluster-md-kmp-64kb-debuginfo
dtb-marvell
dlm-kmp-64kb
dtb-allwinner
kselftests-kmp-64kb
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-64kb-optional-debuginfo
ocfs2-kmp-64kb-debuginfo
ocfs2-kmp-64kb
gfs2-kmp-64kb
dtb-amazon
dtb-cavium
dtb-lg
kernel-64kb-debuginfo
kernel-default-base-rebuild
kernel-rt-devel
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-syms-rt
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
dlm-kmp-rt
kernel-rt
kernel-devel-rt
kernel-source-rt
kernel-azure-devel-debuginfo
kernel-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
linux (Ubuntu package)
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-aws (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)

How to mitigate CVE-2026-43023

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 - 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_63-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_63-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_17-debugsource - update to 1-150700.15.3.1
kernel (Red Hat package) - update to 5.14.0-570.138.1.el9_6
linux (Debian package) - update to 6.1.170-1
kernel-64kb-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-syms - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-obs-build - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default-devel - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-64kb - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
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-livepatch - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
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, 6.4.0-150700.53.63.1
kernel-devel - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-macros - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-64kb-devel - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default-debuginfo - addressed in versions 6.4.0-48.1, 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default-base - addressed in versions 6.4.0-48.1.21.25, 6.4.0-150600.23.118.1.150600.12.56.1, 6.4.0-150700.53.63.1.150700.17.37.1
kernel-debug-debugsource - update to 6.4.0-150600.23.118.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.118.1
kernel-debug - update to 6.4.0-150600.23.118.1
dtb-aarch64 - update to 6.4.0-150600.23.118.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.118.1
kernel-obs-qa - update to 6.4.0-150600.23.118.1
kernel-default-optional - update to 6.4.0-150600.23.118.1
kselftests-kmp-default - update to 6.4.0-150600.23.118.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.118.1
dtb-qcom - update to 6.4.0-150600.23.118.1
dtb-arm - update to 6.4.0-150600.23.118.1
dtb-exynos - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.118.1
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
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 - update to 6.4.0-150600.23.118.1
kernel-debug-devel - update to 6.4.0-150600.23.118.1
kernel-debug-vdso-debuginfo - 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 - update to 6.4.0-150600.23.118.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.118.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.118.1
kernel-default-vdso - update to 6.4.0-150600.23.118.1
dtb-renesas - update to 6.4.0-150600.23.118.1
kernel-64kb-extra - update to 6.4.0-150600.23.118.1
dtb-apm - update to 6.4.0-150600.23.118.1
dtb-sprd - update to 6.4.0-150600.23.118.1
dtb-freescale - update to 6.4.0-150600.23.118.1
dtb-apple - update to 6.4.0-150600.23.118.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-amd - update to 6.4.0-150600.23.118.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-docs - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
dtb-rockchip - update to 6.4.0-150600.23.118.1
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
dlm-kmp-default - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-64kb-extra-debuginfo - 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
kselftests-kmp-64kb - 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, 6.4.0-150700.53.63.1
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-64kb-optional-debuginfo - update to 6.4.0-150600.23.118.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.118.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.118.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.118.1
dtb-amazon - update to 6.4.0-150600.23.118.1
dtb-cavium - update to 6.4.0-150600.23.118.1
dtb-lg - update to 6.4.0-150600.23.118.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.118.1, 6.4.0-150700.53.63.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.118.1.150600.12.56.1
kernel-rt-devel - 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-syms-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-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
dlm-kmp-rt - 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-azure-devel-debuginfo - update to 6.4.0-150700.53.63.1
kernel-azure - update to 6.4.0-150700.53.63.1
kernel-azure-debugsource - update to 6.4.0-150700.53.63.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.63.1
kernel-azure-devel - update to 6.4.0-150700.53.63.1
linux (Ubuntu package) - addressed in versions 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-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-aws (Ubuntu package) - update to 6.8.0-1061.64+1
linux-raspi (Ubuntu package) - addressed in versions 6.8.0-1061.65, 6.8.0-2050.52
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1

External References

Related Security Bulletins