Improper locking in Linux kernel - CVE-2025-39734

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Main Vulnerability Database Vulnerabilities #VU114940

Improper locking in Linux kernel - CVE-2025-39734

Published: September 8, 2025


Vulnerability identifier: #VU114940
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-2025-39734
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the ntfs_file_mmap() function in fs/ntfs3/file.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Ubuntu
Anolis OS
linux-aws-fips (Ubuntu package)
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-kvm (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
kernel
kernel-debug
kernel-debug-devel
kernel-devel
kernel-headers
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
bpftool
kernel-64k-devel
kernel-64k-debug-devel
kernel-64k-debug
kernel-64k
python3-perf
perf
linux-lowlatency (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-xilinx (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-nvidia-lowlatency (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-oem-6.14 (Ubuntu package)
linux-realtime-6.14 (Ubuntu package)
linux-aws-6.14 (Ubuntu package)
linux-gcp-6.14 (Ubuntu package)

How to mitigate CVE-2025-39734

Install update from vendor's repository.

linux-aws-fips (Ubuntu package) - addressed in versions 5.15.0.163.94, 5.15.0-163.173+fips1, 5.15.0.1097.87, 5.15.0.1097.93, 5.15.0-1097.104+fips1, 5.15.0-1097.106+fips1, 6.8.0-100.100+fips1, 6.8.0-1046.49+fips1
linux (Ubuntu package) - addressed in versions 5.15.0.163.140, 5.15.0.163.158, 5.15.0-163.173, 5.15.0.163.173~20.04.1, 5.15.0-163.173~20.04.1, 5.15.0-1038.38, 5.15.0.1038.40, 5.15.0.1049.49, 5.15.0-1049.49, 5.15.0-1049.49~20.04.1, 5.15.0.1049.49~20.04.1, 5.15.0.1061.64, 5.15.0-1061.65, 5.15.0.1091.87, 5.15.0-1091.94, 5.15.0-1091.94~20.04.1, 5.15.0.1091.94~20.04.1, 5.15.0.1092.92, 5.15.0-1092.93, 5.15.0.1092.98~20.04.1, 5.15.0-1092.98~20.04.1, 5.15.0.1094.90, 5.15.0-1094.100, 5.15.0.1094.100~20.04.1, 5.15.0-1094.100~20.04.1, 5.15.0.1097.100, 5.15.0-1097.104, 5.15.0-1097.104~20.04.1, 5.15.0.1097.104~20.04.1, 5.15.0.1097.106~20.04.1, 5.15.0-1097.106~20.04.1, 6.8.0-100.100, 6.8.0-1047.51, 6.14.0-36.36, 6.14.0-36.36~24.04.1, 6.14.0-1016.16~24.04.1, 6.14.0-1017.17, 6.14.0-1020.21
linux-gcp (Ubuntu package) - addressed in versions 5.15.0.1080.79, 5.15.0-1080.88, 5.15.0.1093.92, 5.15.0-1093.99, 5.15.0.1097.93, 5.15.0-1097.106, 6.8.0-1043.48, 6.8.0-1047.50~22.04.2
linux-kvm (Ubuntu package) - addressed in versions 5.15.0.1089.85, 5.15.0-1089.94
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1089.91, 5.15.0.1089.93, 5.15.0.1096.100, 5.15.0-1096.105
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1091.89, 5.15.0-1091.94
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1101.86, 5.15.0-1101.110+fips1, 6.8.0-1046.52+fips1
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1101.99, 5.15.0-1101.110, 6.8.0-1046.52, 6.14.0-1017.17, 6.14.0-1017.17~24.04.1
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1102.111~20.04.1, 5.15.0.1102.111~20.04.1
kernel - update to 6.6.102-5
kernel-debug - update to 6.6.102-5
kernel-debug-devel - update to 6.6.102-5
kernel-devel - update to 6.6.102-5
kernel-headers - update to 6.6.102-5
kernel-tools - update to 6.6.102-5
kernel-tools-libs - update to 6.6.102-5
kernel-tools-libs-devel - update to 6.6.102-5
bpftool - update to 6.6.102-5
kernel-64k-devel - update to 6.6.102-5
kernel-64k-debug-devel - update to 6.6.102-5
kernel-64k-debug - update to 6.6.102-5
kernel-64k - update to 6.6.102-5
python3-perf - update to 6.6.102-5
perf - update to 6.6.102-5
linux-lowlatency (Ubuntu package) - update to 6.8.0-100.100.1
linux-hwe-6.8 (Ubuntu package) - addressed in versions 6.8.0-100.100.1~22.04.1, 6.8.0-100.100~22.04.1
linux-xilinx (Ubuntu package) - addressed in versions 6.8.0.1023.24, 6.8.0-1023.24
linux-aws (Ubuntu package) - addressed in versions 6.8.0-1030.33, 6.8.0-1043.44, 6.8.0-1043.44~22.04.1, 6.8.0-1046.49~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1044.44, 6.8.0-1044.44~22.04.1
linux-nvidia-lowlatency (Ubuntu package) - update to 6.8.0-1046.49.1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1047.50+fips1
linux-gcp-6.8 (Ubuntu package) - update to 6.8.0-1047.50~22.04.2
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-raspi-realtime (Ubuntu package) - addressed in versions 6.8.0-2037.38, 6.8.1-1041.42
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1041.42~22.04.1
linux-oem-6.14 (Ubuntu package) - update to 6.14.0-1016.16
linux-realtime-6.14 (Ubuntu package) - update to 6.14.0-1016.16~24.04.1
linux-aws-6.14 (Ubuntu package) - update to 6.14.0-1017.17~24.04.1
linux-gcp-6.14 (Ubuntu package) - addressed in versions 6.14.0-1018.18, 6.14.0-1020.21~24.04.1

External References

Related Security Bulletins