Resource management error in Linux kernel - CVE-2025-40026

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU117759

Resource management error in Linux kernel - CVE-2025-40026

Published: October 28, 2025


Vulnerability identifier: #VU117759
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-2025-40026
CWE-ID: CWE-399
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 resource management error within the emulator_is_smm() and x86_emulate_instruction() functions in arch/x86/kvm/x86.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Debian Linux
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Ubuntu
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux-aws-fips (Ubuntu package)
linux (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-intel-iotg-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux (Debian package)
bpftool
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel-extra-modules
linux-xilinx (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)

How to mitigate CVE-2025-40026

Install update from vendor's repository.

kernel (Red Hat package) - addressed in versions 4.18.0-553.147.1.el8_10, 5.14.0-427.141.1.el9_4, 5.14.0-570.131.1.el9_6, 5.14.0-687.30.1.el9_8, 6.12.0-55.94.1.el10_0
kernel-rt (Red Hat package) - update to 4.18.0-553.147.1.rt7.488.el8_10
linux-aws-fips (Ubuntu package) - addressed in versions 5.15.0.170.97, 5.15.0-170.180+fips1, 5.15.0.1100.90, 5.15.0.1100.96, 5.15.0-1100.107+fips1, 5.15.0-1100.109+fips1, 6.8.0-106.106+fips1, 6.8.0-1050.53+fips1, 6.8.0-1052.55+fips1
linux (Ubuntu package) - addressed in versions 5.15.0.170.143, 5.15.0.170.159, 5.15.0-170.180, 5.15.0.170.180~20.04.1, 5.15.0-170.180~20.04.1, 5.15.0-170.180~20.04.3, 5.15.0.170.180~20.04.3, 5.15.0.1083.82, 5.15.0-1083.91, 5.15.0.1094.90, 5.15.0-1094.97, 5.15.0.1094.97~20.04.1, 5.15.0-1094.97~20.04.1, 5.15.0.1096.95, 5.15.0-1096.102, 5.15.0.1100.96, 5.15.0.1100.103, 5.15.0-1100.107, 5.15.0-1100.109, 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, 6.17.0-7.7, 6.17.0-1003.4, 6.17.0-1004.4
linux-nvidia-tegra-igx (Ubuntu package) - addressed in versions 5.15.0-1041.41+1, 5.15.0.1041.43
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0.1052.52, 5.15.0-1052.52, 5.15.0-1052.52~20.04.2, 5.15.0.1052.52~20.04.2
linux-intel-iotg-5.15 (Ubuntu package) - addressed in versions 5.15.0.1064.67, 5.15.0-1064.68, 5.15.0-1095.101~20.04.1, 5.15.0.1095.101~20.04.1
linux-gcp-5.15 (Ubuntu package) - addressed in versions 5.15.0.1092.88, 5.15.0-1092.97, 5.15.0.1097.93, 5.15.0-1097.103, 5.15.0.1097.103~20.04.1, 5.15.0-1097.103~20.04.1, 5.15.0.1100.109~20.04.1, 5.15.0-1100.109~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1092.94, 5.15.0.1092.96, 5.15.0.1099.103, 5.15.0-1099.108
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1095.95, 5.15.0-1095.101
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0.1095.95, 5.15.0-1095.96, 6.8.0-1049.52, 6.8.0-1049.52.1, 6.8.0-1049.52~22.04.1
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1097.95, 5.15.0-1097.100, 6.8.0-1050.54, 6.8.0-2040.41, 6.17.0-1005.5
linux-aws-5.15 (Ubuntu package) - addressed in versions 5.15.0.1100.107~20.04.1, 5.15.0-1100.107~20.04.2
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1109.94, 5.15.0-1109.118+fips1, 6.8.0-1052.58+fips1
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.107, 5.15.0-1109.118, 6.8.0-1051.57
linux-azure-5.15 (Ubuntu package) - update to 5.15.0-1110.119~20.04.1
linux (Debian package) - update to 6.1.158-1
bpftool - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-devel - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-headers - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-source - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-tools - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-tools-debuginfo - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-tools-devel - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
perf - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
perf-debuginfo - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
python3-perf - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
python3-perf-debuginfo - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-debugsource - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-debuginfo - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
bpftool-debuginfo - addressed in versions 6.6.0-117.0.0.109, 6.6.0-117.0.0.121, 6.6.0-117.0.0.122
kernel-extra-modules - update to 6.6.0-117.0.0.122
linux-xilinx (Ubuntu package) - update to 6.8.0-1029.30
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1050.53~22.04.1
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
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 6.17.0-1004.4

External References

Related Security Bulletins