Buffer overflow in Linux kernel - CVE-2025-21994

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Main Vulnerability Database Vulnerabilities #VU106864

Buffer overflow in Linux kernel - CVE-2025-21994

Published: April 2, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU106864
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-2025-21994
CWE-ID: CWE-119
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 memory corruption within the parse_dacl() function in fs/smb/server/smbacl.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
Ubuntu
openEuler
linux-aws-fips (Ubuntu package)
linux (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-raspi (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-intel-iotg-5.15 (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux (Debian package)
kernel
kernel-tools
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
linux-hwe-6.8 (Ubuntu package)
linux-azure-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-oem-6.11 (Ubuntu package)

How to mitigate CVE-2025-21994

Install update from vendor's website.

Linux kernel - update to 6.13.9
linux-aws-fips (Ubuntu package) - addressed in versions 5.15.0.142.82, 5.15.0-142.152+fips1, 5.15.0.1085.75, 5.15.0-1085.94+fips1, 5.15.0.1086.82, 5.15.0-1086.93+fips1
linux (Ubuntu package) - addressed in versions 5.15.0.142.128, 5.15.0.142.137, 5.15.0-142.152, 5.15.0-1028.28, 5.15.0.1028.30, 5.15.0-1039.39, 5.15.0.1039.39, 5.15.0.1068.67, 5.15.0-1068.76, 5.15.0.1078.74, 5.15.0-1078.81, 5.15.0.1080.80, 5.15.0-1080.81, 5.15.0.1082.78, 5.15.0-1082.87, 5.15.0.1083.79, 5.15.0.1083.82, 5.15.0-1083.89, 5.15.0.1085.81, 5.15.0-1085.94, 6.8.0-84.84, 6.8.0-84.84.1, 6.8.0-84.84.1~22.04.1, 6.8.0-1023.25, 6.8.0-1036.40, 6.8.0-1039.41, 6.8.0-1040.42, 6.11.0-28.28, 6.11.0-28.28~24.04.1, 6.11.0-1011.11, 6.11.0-1014.14, 6.11.0-1015.16, 6.11.0-1016.16, 6.11.0-1016.16~24.04.1, 6.11.0-1017.18
linux-aws-5.15 (Ubuntu package) - addressed in versions 5.15.0.142.152~20.04.1, 5.15.0-142.152~20.04.1, 5.15.0-1078.81~20.04.1, 5.15.0.1078.81~20.04.1, 5.15.0-1083.89~20.04.1, 5.15.0.1083.89~20.04.1, 5.15.0.1085.94~20.04.1, 5.15.0-1085.94~20.04.1, 5.15.0.1086.93~20.04.1, 5.15.0-1086.93~20.04.1
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-xilinx-zynqmp (Ubuntu package) - addressed in versions 5.15.0.1050.53, 5.15.0-1050.54
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1079.81, 5.15.0.1079.83, 5.15.0.1086.90, 5.15.0-1086.95
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1080.78, 5.15.0-1080.83, 6.8.0-1039.43
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1081.81, 5.15.0-1081.87
linux-intel-iotg-5.15 (Ubuntu package) - addressed in versions 5.15.0-1083.89~20.04.1, 5.15.0.1083.89~20.04.1
linux-aws (Ubuntu package) - addressed in versions 5.15.0.1086.89, 5.15.0-1086.93
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1091.76, 5.15.0-1091.100+fips1
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1091.89, 5.15.0-1091.100, 6.8.0-1036.42~22.04.1, 6.8.0-1038.44, 6.11.0-1018.18, 6.11.0-1018.18~24.04.1
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1091.100~20.04.1, 5.15.0.1091.100~20.04.1
linux (Debian package) - update to 6.1.133-1
kernel - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-tools - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
bpftool - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
bpftool-debuginfo - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-debuginfo - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-debugsource - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-devel - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-headers - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-source - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-tools-debuginfo - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
kernel-tools-devel - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
perf - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
perf-debuginfo - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
python3-perf - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
python3-perf-debuginfo - addressed in versions 6.6.0-87.0.0.82, 6.6.0-87.0.0.93
linux-hwe-6.8 (Ubuntu package) - addressed in versions 6.8.0-84.84~22.04.1, 6.8.0-85.85~22.04.1
linux-azure-nvidia (Ubuntu package) - update to 6.8.0-1025.27
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1037.37, 6.8.0-1037.37~22.04.1
linux-oracle (Ubuntu package) - update to 6.8.0-1037.38
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1037.38~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1039.41~22.04.1, 6.8.0-1040.42~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1039.42, 6.8.0-1039.42.1, 6.8.0-1039.42~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2031.32
linux-realtime (Ubuntu package) - update to 6.8.1-1034.35
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1034.35~22.04.1
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1015.16, 6.11.0-1015.16~24.04.2
linux-oem-6.11 (Ubuntu package) - update to 6.11.0-1024.24

External References

Related Security Bulletins