Improper locking in Linux kernel - CVE-2025-21811

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Main Vulnerability Database Vulnerabilities #VU105146

Improper locking in Linux kernel - CVE-2025-21811

Published: February 28, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU105146
CSH Severity: Low
CVSS v4 BT: 4.3 [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/E:U/U:Clear]
CVE-ID: CVE-2025-21811
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 nilfs_lookup_dirty_data_buffers() function in fs/nilfs2/segment.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Ubuntu
openEuler
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-hwe-5.4 (Ubuntu package)
linux-iot (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-ibm (Ubuntu package)
linux-ibm-5.4 (Ubuntu package)
linux-bluefield (Ubuntu package)
linux-raspi (Ubuntu package)
linux-raspi-5.4 (Ubuntu package)
linux-oracle-5.4 (Ubuntu package)
linux-aws (Ubuntu package)
linux-aws-5.4 (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-gke (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
kernel-debuginfo
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
bpftool-debuginfo
bpftool
kernel
linux-hwe-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)

How to mitigate CVE-2025-21811

Install update from vendor's website.

Linux kernel - update to 6.13.2
linux (Ubuntu package) - addressed in versions 4.4.0.276.282, 4.4.0-276.310, 4.4.0.276.310~14.04.1, 4.4.0-276.310~14.04.1, 4.4.0.1150.147, 4.4.0-1150.156, 4.4.0.1151.148, 4.4.0-1151.162, 4.4.0.1188.192, 4.4.0-1188.203, 4.15.0.245.229, 4.15.0-245.257, 4.15.0.1149.154, 4.15.0-1149.160, 4.15.0.1169.160, 4.15.0-1169.174, 4.15.0.1187.185, 4.15.0-1187.200, 4.15.0-1187.200~16.04.1, 4.15.0.1187.200~16.04.1, 5.4.0.216.208, 5.4.0-216.236, 5.4.0.1144.138, 5.4.0-1144.154, 5.4.0.1149.151, 5.4.0-1149.158, 5.4.0-1149.158~18.04.1, 5.4.0.1149.158~18.04.1, 5.4.0.1151.158~18.04.1, 5.4.0-1151.158~18.04.1, 5.15.0.140.126, 5.15.0.140.135, 5.15.0-140.150, 5.15.0-140.150~20.04.1, 5.15.0.140.150~20.04.1, 5.15.0.1066.65, 5.15.0-1066.74, 5.15.0.1076.72, 5.15.0-1076.79, 5.15.0-1076.79~20.04.1, 5.15.0.1076.79~20.04.1, 5.15.0.1078.78, 5.15.0-1078.79, 5.15.0.1079.79, 5.15.0-1079.85, 5.15.0.1080.76, 5.15.0-1080.85, 5.15.0.1081.77, 5.15.0-1081.87, 5.15.0-1081.87~20.04.1, 5.15.0.1081.87~20.04.1, 6.8.0-64.67, 6.8.0-1031.31, 6.8.0-1032.34~22.04.1, 6.11.0-26.26, 6.11.0-26.26~24.04.1, 6.11.0-1010.10, 6.11.0-1013.13, 6.11.0-1015.15, 6.11.0-1015.15~24.04.1, 6.11.0-1022.22
linux-fips (Ubuntu package) - addressed in versions 4.4.0.1120.121, 4.4.0-1120.127
linux-gcp (Ubuntu package) - addressed in versions 4.15.0.245.257~16.04.1, 4.15.0-245.257~16.04.1, 4.15.0.1180.193, 4.15.0-1180.197, 4.15.0.1180.197~16.04.1, 4.15.0-1180.197~16.04.1, 5.15.0.1083.79, 5.15.0-1083.92, 6.8.0-1033.35, 6.8.0-1033.35~22.04.1
linux-aws-fips (Ubuntu package) - addressed in versions 4.15.0.1142.139, 4.15.0-1142.154, 4.15.0.2125.119, 4.15.0-2125.131, 5.4.0.1120.117, 5.4.0-1120.130, 5.4.0.1146.93, 5.4.0-1146.156+fips1, 5.15.0.1084.80, 5.15.0-1084.91+fips1
linux-azure (Ubuntu package) - addressed in versions 4.15.0-1149.160~16.04.1, 4.15.0.1149.160~16.04.1, 4.15.0.1195.163, 4.15.0-1195.210, 4.15.0-1195.210~14.04.1, 4.15.0.1195.210~14.04.1, 4.15.0.1195.210~16.04.1, 4.15.0-1195.210~16.04.1, 5.4.0.1133.129, 5.4.0-1133.142, 5.4.0.1151.145, 5.4.0-1151.158, 5.15.0-1037.37, 5.15.0.1037.37, 5.15.0.1089.87, 5.15.0-1089.98, 5.15.0.1089.98~20.04.1, 5.15.0-1089.98~20.04.1, 6.8.0-1022.23, 6.8.0-1034.39, 6.8.0-1034.39~22.04.1
linux-gcp-fips (Ubuntu package) - addressed in versions 4.15.0.2088.86, 4.15.0-2088.94, 5.4.0.1149.91, 5.4.0-1149.158+fips1, 5.15.0.1083.73, 5.15.0-1083.92+fips1
linux-azure-fips (Ubuntu package) - addressed in versions 4.15.0.2104.100, 4.15.0-2104.110, 5.4.0.1151.88, 5.4.0-1151.158+fips1, 5.15.0.1089.74, 5.15.0-1089.98+fips1
linux-hwe-5.4 (Ubuntu package) - addressed in versions 5.4.0.216.236~18.04.1, 5.4.0-216.236~18.04.1
linux-iot (Ubuntu package) - update to 5.4.0-1051.54
linux-xilinx-zynqmp (Ubuntu package) - addressed in versions 5.4.0.1064.64, 5.4.0-1064.68, 5.15.0.1050.53, 5.15.0-1050.54
linux-ibm (Ubuntu package) - addressed in versions 5.4.0-1092.97, 5.4.0.1092.121, 6.8.0-64.67.1, 6.8.0-64.67.1~22.04.1, 6.8.0-1029.29, 6.8.0-1029.29~22.04.1
linux-ibm-5.4 (Ubuntu package) - addressed in versions 5.4.0.1092.97~18.04.1, 5.4.0-1092.97~18.04.1
linux-bluefield (Ubuntu package) - addressed in versions 5.4.0.1105.101, 5.4.0-1105.112
linux-raspi (Ubuntu package) - addressed in versions 5.4.0-1129.142, 5.4.0.1129.160, 6.8.0-1031.35
linux-raspi-5.4 (Ubuntu package) - addressed in versions 5.4.0-1129.142~18.04.1, 5.4.0.1129.142~18.04.1
linux-oracle-5.4 (Ubuntu package) - addressed in versions 5.4.0.1144.154~18.04.1, 5.4.0-1144.154~18.04.1
linux-aws (Ubuntu package) - addressed in versions 5.4.0.1146.143, 5.4.0-1146.156, 5.15.0-1026.26, 5.15.0.1026.28, 5.15.0.1078.76, 5.15.0-1078.81, 5.15.0.1079.85~20.04.1, 5.15.0-1079.85~20.04.1, 5.15.0.1084.86, 5.15.0-1084.91, 6.11.0-1014.15
linux-aws-5.4 (Ubuntu package) - addressed in versions 5.4.0-1146.156~18.04.1, 5.4.0.1146.156~18.04.1
linux-hwe-5.15 (Ubuntu package) - addressed in versions 5.15.0-142.152~20.04.1, 5.15.0.142.152~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1077.79, 5.15.0.1077.81, 5.15.0.1084.88, 5.15.0-1084.93
linux-gke (Ubuntu package) - addressed in versions 5.15.0.1081.80, 5.15.0-1081.87
linux-gcp-5.15 (Ubuntu package) - addressed in versions 5.15.0.1083.92~20.04.1, 5.15.0-1083.92~20.04.1
linux-aws-5.15 (Ubuntu package) - addressed in versions 5.15.0.1084.91~20.04.1, 5.15.0-1084.91~20.04.1
kernel-debuginfo - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
python3-perf-debuginfo - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
python3-perf - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
perf-debuginfo - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
perf - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel-tools-devel - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel-tools-debuginfo - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel-tools - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel-source - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel-headers - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel-devel - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel-debugsource - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
bpftool-debuginfo - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
bpftool - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
kernel - addressed in versions 6.6.0-84.0.0.78, 6.6.0-84.0.0.89
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-64.67~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1015.17, 6.8.0-1028.32, 6.8.0-1029.30, 6.8.0-1029.30~22.04.1, 6.8.0-1031.34, 6.8.0-1031.34.1, 6.8.0-1031.34~22.04.1, 6.8.0-1032.34~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2026.27
linux-realtime (Ubuntu package) - update to 6.8.1-1025.26
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1014.15, 6.11.0-1014.15~24.04.1, 6.11.0-1016.17

External References

Related Security Bulletins