Improper locking in Linux kernel - CVE-2026-31647

Vulnerability identifier: #VU127742

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-2026-31647

CWE-ID: CWE-667

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 improper lock handling in the idpf async virtual channel handling logic when processing asynchronous virtual channel messages. A local user can trigger the vulnerable code path to cause a denial of service.

The issue is manifested as an invalid wait context in PREEMPT_RT environments.

Linux kernel
Debian Linux
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Availability Extension 15
Legacy Module
SUSE Linux Enterprise Live Patching
Public Cloud Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
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-SLE15-SP7_Update_18-debugsource
kernel-livepatch-6_4_0-150700_53_66-default
kernel-livepatch-6_4_0-150700_53_66-default-debuginfo
kernel-devel-rt
kernel-source-rt
kernel-rt
dlm-kmp-rt
gfs2-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-syms-rt
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
ocfs2-kmp-rt
gfs2-kmp-rt
kernel-rt-debuginfo
kernel-64kb-debuginfo
kernel-default-extra
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-64kb
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-obs-build
kernel-syms
kernel-obs-build-debugsource
kernel-source
kernel-azure
kernel-azure-devel-debuginfo
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-devel
kernel-default-extra-debuginfo
kernel-64kb-debugsource
kernel-default-debugsource
kernel-default-debuginfo
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default
cluster-md-kmp-default
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-macros
kernel-devel
kernel-default-devel
kernel-default-devel-debuginfo
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-default-base
kernel-docs
linux (Debian package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
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-SLE15-SP7_Update_18-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_66-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_66-default-debuginfo - update to 1-150700.15.3.1
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-rt - update to 6.4.0-150700.7.62.1
dlm-kmp-rt - 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-debuginfo - 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
kernel-rt-devel - 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
kernel-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.66.1
kernel-default-extra - update to 6.4.0-150700.53.66.1
kernel-zfcpdump - update to 6.4.0-150700.53.66.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.66.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.66.1
kernel-64kb - update to 6.4.0-150700.53.66.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.66.1
kernel-default-livepatch - update to 6.4.0-150700.53.66.1
kernel-obs-build - update to 6.4.0-150700.53.66.1
kernel-syms - update to 6.4.0-150700.53.66.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.66.1
kernel-source - update to 6.4.0-150700.53.66.1
kernel-azure - update to 6.4.0-150700.53.66.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.66.1
kernel-azure-debugsource - update to 6.4.0-150700.53.66.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.66.1
kernel-azure-devel - update to 6.4.0-150700.53.66.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.66.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.66.1
kernel-default-debugsource - update to 6.4.0-150700.53.66.1
kernel-default-debuginfo - update to 6.4.0-150700.53.66.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
reiserfs-kmp-default - update to 6.4.0-150700.53.66.1
kernel-default - update to 6.4.0-150700.53.66.1
ocfs2-kmp-default - update to 6.4.0-150700.53.66.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
gfs2-kmp-default - update to 6.4.0-150700.53.66.1
dlm-kmp-default - update to 6.4.0-150700.53.66.1
cluster-md-kmp-default - update to 6.4.0-150700.53.66.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.66.1
kernel-macros - update to 6.4.0-150700.53.66.1
kernel-devel - update to 6.4.0-150700.53.66.1
kernel-default-devel - update to 6.4.0-150700.53.66.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.66.1
kernel-64kb-devel - update to 6.4.0-150700.53.66.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.66.1
kernel-default-base - update to 6.4.0-150700.53.66.1.150700.17.39.1
kernel-docs - update to 6.4.0-150700.53.66.2
linux (Debian package) - update to 6.12.85-1

• https://git.kernel.org/stable/c/3bb632c6b6d8154e9019beda4a43a4b518ee3e8a
• https://git.kernel.org/stable/c/591478118293c1bd628de330a99eb1eb2ef8d76b
• https://git.kernel.org/stable/c/b448529f2f2921c6fe82fd4e985cc7c05cbf02a3
• https://git.kernel.org/stable/c/e02c974fc331f04b5ba2007d4bc6862df8a43148

• Improper locking in Linux kernel intel idpf driver
• Debian update for linux
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel