Use-after-free in Linux kernel - CVE-2026-31663

Vulnerability identifier: #VU127741

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-2026-31663

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in xfrm_input_resume and transport_finish when processing packets after asynchronous crypto completion. A local user can trigger a race with device teardown to cause a denial of service.

Linux kernel
Debian Linux
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Basesystem Module
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Anolis OS
openEuler
kernel-livepatch-6_4_0-150700_53_81-default
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_21-debugsource
kernel-rt (Red Hat package)
cluster-md-kmp-default-debuginfo
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-devel
kernel-macros
kernel-default-devel
kernel-default-devel-debuginfo
kernel-default
kernel-default-debugsource
kernel-default-debuginfo
dlm-kmp-default
kernel-64kb-devel
gfs2-kmp-default-debuginfo
gfs2-kmp-default
cluster-md-kmp-default
ocfs2-kmp-default
dlm-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default-extra-debuginfo
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure
kernel-default-livepatch-devel
kernel-default-livepatch
reiserfs-kmp-default-debuginfo
kernel-64kb
kernel-source
kernel-obs-build-debugsource
kernel-obs-build
kernel-syms
kernel-docs
kernel-64kb-debugsource
kernel-64kb-devel-debuginfo
kernel-default-extra
kernel-64kb-debuginfo
kernel-default-base
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-headers
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-extra-modules
kernel-debug
kernel-debug-devel
kernel-tools-libs
kernel-tools-libs-devel
kernel (Red Hat package)
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_4_0-150700_53_81-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_21-debugsource - update to 1-150700.15.3.1
kernel-rt (Red Hat package) - update to 4.18.0-553.164.1.rt7.505.el8_10
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.81.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.81.1
kernel-zfcpdump - update to 6.4.0-150700.53.81.1
kernel-devel - update to 6.4.0-150700.53.81.1
kernel-macros - update to 6.4.0-150700.53.81.1
kernel-default-devel - update to 6.4.0-150700.53.81.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default - update to 6.4.0-150700.53.81.1
kernel-default-debugsource - update to 6.4.0-150700.53.81.1
kernel-default-debuginfo - update to 6.4.0-150700.53.81.1
dlm-kmp-default - update to 6.4.0-150700.53.81.1
kernel-64kb-devel - update to 6.4.0-150700.53.81.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
gfs2-kmp-default - update to 6.4.0-150700.53.81.1
cluster-md-kmp-default - update to 6.4.0-150700.53.81.1
ocfs2-kmp-default - update to 6.4.0-150700.53.81.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default - update to 6.4.0-150700.53.81.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-debugsource - update to 6.4.0-150700.53.81.1
kernel-azure-devel - update to 6.4.0-150700.53.81.1
kernel-azure - update to 6.4.0-150700.53.81.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.81.1
kernel-default-livepatch - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
kernel-64kb - update to 6.4.0-150700.53.81.1
kernel-source - update to 6.4.0-150700.53.81.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.81.1
kernel-obs-build - update to 6.4.0-150700.53.81.1
kernel-syms - update to 6.4.0-150700.53.81.1
kernel-docs - update to 6.4.0-150700.53.81.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.81.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-extra - update to 6.4.0-150700.53.81.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-base - update to 6.4.0-150700.53.81.1.150700.17.45.1
kernel-devel - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-source - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-tools - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-tools-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-tools-devel - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
perf - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
perf-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
python3-perf - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
python3-perf-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-headers - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-debugsource - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
bpftool-debuginfo - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
bpftool - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-extra-modules - update to 6.6.0-145.3.17.150
python3-perf - update to 6.6.102-7
bpftool - update to 6.6.102-7
kernel - update to 6.6.102-7
kernel-debug - update to 6.6.102-7
kernel-debug-devel - update to 6.6.102-7
kernel-devel - update to 6.6.102-7
kernel-headers - update to 6.6.102-7
kernel-tools - update to 6.6.102-7
kernel-tools-libs - update to 6.6.102-7
kernel-tools-libs-devel - update to 6.6.102-7
perf - update to 6.6.102-7
kernel (Red Hat package) - update to 6.12.0-211.55.1.el10_2
linux (Debian package) - update to 6.12.94-1

• https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b
• https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb
• https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2

• Use-after-free in Linux kernel xfrm
• Debian update for linux
• openEuler 24.03 LTS SP3 update for kernel
• openEuler 24.03 LTS SP1 update for kernel
• Anolis OS update for kernel:6.6
• Red Hat Enterprise Linux 10 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• SUSE update for the Linux Kernel