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

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Main Vulnerability Database Vulnerabilities #VU127741

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

Published: April 25, 2026


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

Vulnerability details

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.


Affected software

Linux kernel
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Micro
SUSE Linux Micro Extras
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
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 ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
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
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
Ubuntu
Anolis OS
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-realtime (Ubuntu package)
linux-lowlatency-hwe-6.8 (Ubuntu package)
linux-fips (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-nvidia-lowlatency (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-nvidia-6.8 (Ubuntu package)
linux-gke (Ubuntu package)
linux-ibm-6.8 (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
kgraft-patch-4_12_14-122_333-default
kernel-livepatch-6_4_0-150700_7_75-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_75-rt
kernel-livepatch-SLE15-SP7-RT_Update_20-debugsource
kernel-livepatch-SLE15-SP7_Update_21-debugsource
kernel-livepatch-6_4_0-150700_53_81-default
kernel-livepatch-6_4_0-150700_53_81-default-debuginfo
kernel-macros
kernel-default-devel-debuginfo
gfs2-kmp-default
kernel-devel
kernel-default-man
kernel-source
kernel-default-base-debuginfo
gfs2-kmp-default-debuginfo
kernel-default-devel
ocfs2-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-base
kernel-syms
cluster-md-kmp-default
ocfs2-kmp-default
dlm-kmp-default-debuginfo
dlm-kmp-default
kernel-default-debuginfo
kernel-default-kgraft-devel
kernel-default-debugsource
kernel-default-kgraft
kernel-default
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-64kb-devel
kernel-64kb
kernel-64kb-debugsource
kernel-obs-build
kernel-rt-livepatch
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-rt
kernel-devel-rt
kernel-source-rt
kernel-kvmsmall
kernel-default-livepatch
kernel-kvmsmall-debugsource
kernel-obs-build-debugsource
kernel-kvmsmall-debuginfo
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
ocfs2-kmp-rt
gfs2-kmp-rt-debuginfo
dlm-kmp-rt
kernel-rt-devel
cluster-md-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-syms-rt
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-default-livepatch-devel
reiserfs-kmp-default
kernel-azure
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
reiserfs-kmp-default-debuginfo
kernel-docs
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
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
linux (Debian package)

How to mitigate CVE-2026-31663

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 6.8.0-146.146
linux-lowlatency (Ubuntu package) - update to 6.8.0-146.146.1
linux-azure (Ubuntu package) - update to 6.8.0-1070.78
linux-gcp (Ubuntu package) - update to 6.8.0-1070.78
linux-aws (Ubuntu package) - update to 6.8.0-1066.69
linux-ibm (Ubuntu package) - update to 6.8.0-1066.67
linux-oracle (Ubuntu package) - update to 6.8.0-1063.66
linux-azure-fde (Ubuntu package) - update to 6.8.0-1068.75
linux-nvidia (Ubuntu package) - update to 6.8.0-1064.67
linux-realtime (Ubuntu package) - update to 6.8.1-1061.62
linux-lowlatency-hwe-6.8 (Ubuntu package) - update to 6.8.0-146.146.1~22.04.1
linux-fips (Ubuntu package) - update to 6.8.0-146.146+fips1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1068.75~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1066.69~22.04.1
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1035.38
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1070.78~22.04.1
linux-nvidia-lowlatency (Ubuntu package) - update to 6.8.0-1064.67.1
linux-gkeop (Ubuntu package) - update to 6.8.0-1051.55
linux-nvidia-6.8 (Ubuntu package) - update to 6.8.0-1064.67~22.04.1
linux-gke (Ubuntu package) - update to 6.8.0-1065.73
linux-ibm-6.8 (Ubuntu package) - update to 6.8.0-1066.67~22.04.1
linux-gcp-6.8 (Ubuntu package) - update to 6.8.0-1070.78~22.04.1
linux-aws-fips (Ubuntu package) - update to 6.8.0-1066.69+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1070.78+fips1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1069.77+fips1
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1061.62~22.04.1
kgraft-patch-4_12_14-122_333-default - update to 1-8.3.3
kernel-livepatch-6_4_0-150700_7_75-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_75-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_20-debugsource - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_21-debugsource - update to 1-150700.15.3.1
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-macros - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
gfs2-kmp-default - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
kernel-devel - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-default-man - update to 4.12.14-122.333.2
kernel-source - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-default-base-debuginfo - update to 4.12.14-122.333.2
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
kernel-default-devel - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
kernel-default-base - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1.21.35, 6.4.0-52.1.21.36, 6.4.0-150700.53.81.1.150700.17.45.1
kernel-syms - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
dlm-kmp-default - addressed in versions 4.12.14-122.333.2, 6.4.0-150700.53.81.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-default-kgraft-devel - update to 4.12.14-122.333.2
kernel-default-debugsource - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-default-kgraft - update to 4.12.14-122.333.2
kernel-default - addressed in versions 4.12.14-122.333.2, 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel (Red Hat package) - addressed in versions 4.18.0-305.211.1.el8_4, 4.18.0-372.220.1.el8_6, 4.18.0-477.172.1.el8_8, 5.14.0-427.154.1.el9_4, 5.14.0-570.146.1.el9_6, 6.12.0-55.108.1.el10_0, 6.12.0-211.55.1.el10_2
kernel-rt (Red Hat package) - addressed in versions 4.18.0-553.164.1.rt7.505.el8_10, 5.14.0-284.197.1.rt14.482.el9_2
kernel-64kb-devel - addressed in versions 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-64kb - addressed in versions 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-64kb-debugsource - addressed in versions 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-obs-build - addressed in versions 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-rt-livepatch - update to 6.4.0-52.1
kernel-rt-debugsource - addressed in versions 6.4.0-52.1, 6.4.0-150700.7.75.1
kernel-rt-debuginfo - addressed in versions 6.4.0-52.1, 6.4.0-150700.7.75.1
kernel-rt - addressed in versions 6.4.0-52.1, 6.4.0-150700.7.75.1
kernel-devel-rt - addressed in versions 6.4.0-52.1, 6.4.0-150700.7.75.1
kernel-source-rt - addressed in versions 6.4.0-52.1, 6.4.0-150700.7.75.1
kernel-kvmsmall - update to 6.4.0-52.1
kernel-default-livepatch - addressed in versions 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-kvmsmall-debugsource - update to 6.4.0-52.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-52.1, 6.4.0-150700.53.81.1
kernel-kvmsmall-debuginfo - update to 6.4.0-52.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.75.1
gfs2-kmp-rt - update to 6.4.0-150700.7.75.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.75.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.75.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.75.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.75.1
dlm-kmp-rt - update to 6.4.0-150700.7.75.1
kernel-rt-devel - update to 6.4.0-150700.7.75.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.75.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.75.1
kernel-syms-rt - update to 6.4.0-150700.7.75.1
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-default-livepatch-devel - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default - update to 6.4.0-150700.53.81.1
kernel-azure - update to 6.4.0-150700.53.81.1
kernel-azure-devel - update to 6.4.0-150700.53.81.1
kernel-azure-debugsource - update to 6.4.0-150700.53.81.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.81.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.81.1
kernel-default-extra - update to 6.4.0-150700.53.81.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.81.1
kernel-docs - update to 6.4.0-150700.53.81.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.81.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.81.1
python3-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
perf-debuginfo - 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
kernel-tools-devel - 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 - 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-headers - addressed in versions 6.6.0-145.1.20.157, 6.6.0-145.3.17.150
kernel-devel - 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
kernel - update to 6.6.102-7
bpftool - 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
python3-perf - update to 6.6.102-7
linux (Debian package) - update to 6.12.94-1

External References

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