Improper locking in Linux kernel - CVE-2025-40047

Vulnerability identifier: #VU117743

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-2025-40047

CWE-ID: CWE-667

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 improper locking within the io_waitid_wait() function in io_uring/waitid.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Availability Extension 15
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Public Cloud Module
SUSE Real Time Module
SUSE Linux Enterprise Live Patching
Legacy Module
Development Tools Module
Basesystem Module
Ubuntu
kernel-livepatch-6_4_0-150700_7_25-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_25-rt
kernel-livepatch-SLE15-SP7-RT_Update_7-debugsource
kernel-livepatch-SLE15-SP7_Update_7-debugsource
kernel-livepatch-6_4_0-150700_53_25-default
kernel-livepatch-6_4_0-150700_53_25-default-debuginfo
kernel (Red Hat package)
ocfs2-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt
kernel-source-rt
kernel-devel-rt
kernel-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-devel
kernel-rt-debugsource
gfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
dlm-kmp-rt
kernel-syms-rt
kernel-rt-devel-debuginfo
cluster-md-kmp-rt
kernel-devel-azure
kernel-source-azure
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-azure-debugsource
kernel-azure
kernel-macros
reiserfs-kmp-default-debuginfo
kernel-devel
kernel-default-debugsource
kernel-default-devel
kernel-default-debuginfo
kernel-default-devel-debuginfo
kernel-default
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-64kb
kernel-zfcpdump-debugsource
reiserfs-kmp-default
gfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default
cluster-md-kmp-default
dlm-kmp-default
cluster-md-kmp-default-debuginfo
kernel-zfcpdump
ocfs2-kmp-default-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
kernel-source
kernel-obs-build-debugsource
kernel-syms
kernel-default-livepatch
kernel-default-livepatch-devel
kernel-obs-build
kernel-zfcpdump-debuginfo
kernel-default-base
kernel-docs
linux (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-xilinx (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-oem-6.17 (Ubuntu package)

Install update from vendor's repository.

kernel-livepatch-6_4_0-150700_7_25-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_25-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_7-debugsource - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7_Update_7-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_25-default - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_25-default-debuginfo - update to 1-150700.15.3.1
kernel (Red Hat package) - addressed in versions 5.14.0-570.66.1.el9_6, 5.14.0-611.8.1.el9_7, 6.12.0-124.20.1.el10_1
ocfs2-kmp-rt - update to 6.4.0-150700.7.25.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.25.1
kernel-rt - update to 6.4.0-150700.7.25.1
kernel-source-rt - update to 6.4.0-150700.7.25.1
kernel-devel-rt - update to 6.4.0-150700.7.25.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.25.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.25.1
kernel-rt-devel - update to 6.4.0-150700.7.25.1
kernel-rt-debugsource - update to 6.4.0-150700.7.25.1
gfs2-kmp-rt - update to 6.4.0-150700.7.25.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.25.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.25.1
dlm-kmp-rt - update to 6.4.0-150700.7.25.1
kernel-syms-rt - update to 6.4.0-150700.7.25.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.25.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.25.1
kernel-devel-azure - update to 6.4.0-150700.20.21.1
kernel-source-azure - update to 6.4.0-150700.20.21.1
kernel-syms-azure - update to 6.4.0-150700.20.21.1
kernel-azure-debuginfo - update to 6.4.0-150700.20.21.1
kernel-azure-devel - update to 6.4.0-150700.20.21.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.20.21.1
kernel-azure-debugsource - update to 6.4.0-150700.20.21.1
kernel-azure - update to 6.4.0-150700.20.21.1
kernel-macros - update to 6.4.0-150700.53.25.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.25.1
kernel-devel - update to 6.4.0-150700.53.25.1
kernel-default-debugsource - update to 6.4.0-150700.53.25.1
kernel-default-devel - update to 6.4.0-150700.53.25.1
kernel-default-debuginfo - update to 6.4.0-150700.53.25.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.25.1
kernel-default - update to 6.4.0-150700.53.25.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.25.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.25.1
kernel-64kb-devel - update to 6.4.0-150700.53.25.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.25.1
kernel-64kb - update to 6.4.0-150700.53.25.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.25.1
reiserfs-kmp-default - update to 6.4.0-150700.53.25.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.25.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.25.1
gfs2-kmp-default - update to 6.4.0-150700.53.25.1
ocfs2-kmp-default - update to 6.4.0-150700.53.25.1
cluster-md-kmp-default - update to 6.4.0-150700.53.25.1
dlm-kmp-default - update to 6.4.0-150700.53.25.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.25.1
kernel-zfcpdump - update to 6.4.0-150700.53.25.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.25.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.25.1
kernel-default-extra - update to 6.4.0-150700.53.25.1
kernel-source - update to 6.4.0-150700.53.25.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.25.1
kernel-syms - update to 6.4.0-150700.53.25.1
kernel-default-livepatch - update to 6.4.0-150700.53.25.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.25.1
kernel-obs-build - update to 6.4.0-150700.53.25.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.25.1
kernel-default-base - update to 6.4.0-150700.53.25.1.150700.17.17.1
kernel-docs - update to 6.4.0-150700.53.25.2
linux (Ubuntu package) - addressed in versions 6.8.0-106.106, 6.8.0-106.106.1, 6.8.0-106.106.1~22.04.1, 6.8.0-106.106~22.04.1, 6.8.0-1035.38, 6.8.0-1047.48, 6.8.0-1047.48~22.04.1, 6.8.0-1048.53, 6.8.0-1049.49, 6.8.0-1049.49~22.04.1, 6.8.0-1050.53, 6.8.0-1052.55, 6.8.0-1052.55~22.04.1, 6.17.0-14.14, 6.17.0-1006.7, 6.17.0-1008.8
linux-aws-fips (Ubuntu package) - addressed in versions 6.8.0-106.106+fips1, 6.8.0-1050.53+fips1, 6.8.0-1052.55+fips1
linux-xilinx (Ubuntu package) - update to 6.8.0-1029.30
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1049.52, 6.8.0-1049.52.1, 6.8.0-1049.52~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1050.53~22.04.1
linux-raspi (Ubuntu package) - addressed in versions 6.8.0-1050.54, 6.8.0-2040.41
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1051.57, 6.17.0-1008.8
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1052.58+fips1
linux-realtime (Ubuntu package) - addressed in versions 6.8.1-1045.46, 6.8.1-1045.46~22.04.1
linux-gcp (Ubuntu package) - update to 6.17.0-1007.7
linux-aws (Ubuntu package) - update to 6.17.0-1007.7
linux-oem-6.17 (Ubuntu package) - update to 6.17.0-1011.11

• https://git.kernel.org/stable/c/2f8229d53d984c6a05b71ac9e9583d4354e3b91f
• https://git.kernel.org/stable/c/3e2205db2f0608898d535da1964e1b376aacfdaa
• https://git.kernel.org/stable/c/696ba6032081e617564a8113a001b8d7943cb928

• Improper locking in Linux kernel io_uring
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 10 update for kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-gcp
• Ubuntu update for linux
• Ubuntu update for linux-aws
• Ubuntu update for linux-oem-6.17
• Ubuntu update for linux-azure
• Ubuntu update for linux
• Ubuntu update for linux-aws-fips
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-realtime
• Ubuntu update for linux-aws-6.8
• Ubuntu update for linux-azure-6.8
• Ubuntu update for linux-azure
• Ubuntu update for linux-raspi
• Ubuntu update for linux-azure-fips
• Ubuntu update for linux-xilinx