Use-after-free in Linux kernel - CVE-2025-21722

Vulnerability identifier: #VU104962

CSH Severity: Low

CVSS v4 BT: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21722

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the nilfs_clear_dirty_pages() and nilfs_clear_folio_dirty() functions in fs/nilfs2/page.c. A local user can escalate privileges on the system.

Linux kernel
Ubuntu
openEuler
Anolis OS
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)
python2-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
python3-perf-debuginfo
python3-perf
python2-perf-debuginfo
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)
kernel-headers
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-debug
kernel-debug-devel
kernel-tools-libs
kernel-tools-libs-devel
linux-hwe-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)

Install update from vendor's website.

Linux kernel - addressed in versions 5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.12.13, 6.13.2, 6.14
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
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
python2-perf - update to 4.19.90-2504.1.0.0322
perf-debuginfo - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
perf - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-tools-devel - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-tools-debuginfo - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-tools - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-source - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-devel - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-debugsource - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-debuginfo - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
bpftool-debuginfo - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
bpftool - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
python3-perf-debuginfo - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
python3-perf - addressed in versions 4.19.90-2504.1.0.0322, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
python2-perf-debuginfo - update to 4.19.90-2504.1.0.0322
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
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
kernel-headers - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
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
python3-perf - update to 6.6.102-6
bpftool - update to 6.6.102-6
kernel - update to 6.6.102-6
kernel-debug - update to 6.6.102-6
kernel-debug-devel - update to 6.6.102-6
kernel-devel - update to 6.6.102-6
kernel-headers - update to 6.6.102-6
kernel-tools - update to 6.6.102-6
kernel-tools-libs - update to 6.6.102-6
kernel-tools-libs-devel - update to 6.6.102-6
perf - update to 6.6.102-6
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

• https://git.kernel.org/stable/c/1098bb8d52419d262a3358d099a1598a920b730f
• https://git.kernel.org/stable/c/19296737024cd220a1d6590bf4c092bca8c99497
• https://git.kernel.org/stable/c/557ccf5e49f1fb848a29698585bcab2e50a597ef
• https://git.kernel.org/stable/c/ca76bb226bf47ff04c782cacbd299f12ddee1ec1
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.235
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.179
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.291
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.129
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.13
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.2
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14

• Use-after-free in Linux kernel nilfs2
• openEuler 24.03 LTS SP1 update for kernel
• openEuler 24.03 LTS update for kernel
• openEuler 20.03 LTS SP4 update for kernel
• openEuler 22.03 LTS SP4 update for kernel
• openEuler 22.03 LTS SP3 update for kernel
• Ubuntu update for linux-xilinx-zynqmp
• Ubuntu update for linux-gcp-fips
• Ubuntu update for linux
• Ubuntu update for linux-gcp-5.15
• Ubuntu update for linux-gcp-fips
• Ubuntu update for linux-gcp
• Ubuntu update for linux-azure-fips
• Ubuntu update for linux-azure
• Ubuntu update for linux-gke
• Ubuntu update for linux-azure-fips
• Ubuntu update for linux-intel-iot-realtime
• Ubuntu update for linux-azure
• Ubuntu update for linux-ibm-5.4
• Ubuntu update for linux-oracle-5.4
• Ubuntu update for linux-hwe-5.4
• Ubuntu update for linux-bluefield
• Ubuntu update for linux-ibm
• Ubuntu update for linux-aws-fips
• Ubuntu update for linux-aws
• Ubuntu update for linux-raspi
• Ubuntu update for linux-raspi-5.4
• Ubuntu update for linux
• Ubuntu update for linux-aws-fips
• Ubuntu update for linux-aws-5.4
• Ubuntu update for linux-aws
• Ubuntu update for linux-aws-5.15
• Ubuntu update for linux-hwe-5.15
• Ubuntu update for linux-xilinx-zynqmp
• Ubuntu update for linux-iot
• Ubuntu update for linux-hwe-6.8
• Ubuntu update for linux-realtime
• Ubuntu update for linux
• Ubuntu update for linux-ibm
• Ubuntu update for linux-aws-6.8
• Ubuntu update for linux-gcp
• Ubuntu update for linux-raspi-realtime
• Ubuntu update for linux-raspi
• Ubuntu update for linux-azure
• Ubuntu update for linux
• Ubuntu update for linux-aws-fips
• Ubuntu update for linux-gcp-fips
• Ubuntu update for linux-gcp
• Ubuntu update for linux-azure
• Ubuntu update for linux-fips
• Ubuntu update for linux
• Ubuntu update for linux-azure-fips
• Anolis OS update for kernel:6.6