Use-after-free in Linux kernel - CVE-2025-22040

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Main Vulnerability Database Vulnerabilities #VU107673

Use-after-free in Linux kernel - CVE-2025-22040

Published: April 22, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU107673
CSH Severity: Low
CVSS v4: 8.5 [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]
CVE-ID: CVE-2025-22040
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a use-after-free error within the smb2_session_logoff() function in fs/smb/server/smb2pdu.c, within the ksmbd_expire_session(), ksmbd_sessions_deregister(), ksmbd_user_session_put() and __session_create() functions in fs/smb/server/mgmt/user_session.c, within the ksmbd_get_encryption_key() function in fs/smb/server/auth.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
Debian Linux
Ubuntu
openEuler
linux (Debian package)
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
linux (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-azure-nvidia (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-gcp-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-azure (Ubuntu package)
linux-oem-6.11 (Ubuntu package)
linux-aws (Ubuntu package)

How to mitigate CVE-2025-22040

Install update from vendor's website.

Linux kernel - addressed in versions 6.1.134, 6.6.87, 6.12.23, 6.13.11, 6.14.2
linux (Debian package) - update to 6.1.135-1
kernel - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
bpftool - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
bpftool-debuginfo - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-debuginfo - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-debugsource - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-devel - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-headers - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-source - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-tools - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-tools-debuginfo - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
kernel-tools-devel - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
perf - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
perf-debuginfo - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
python3-perf - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
python3-perf-debuginfo - addressed in versions 6.6.0-89.0.0.83, 6.6.0-89.0.0.94
linux (Ubuntu package) - addressed in versions 6.8.0-86.87, 6.8.0-86.87.1, 6.8.0-86.87.1~22.04.1, 6.8.0-1025.28, 6.8.0-1038.39, 6.8.0-1039.39, 6.8.0-1039.39~22.04.1, 6.8.0-1041.43~22.04.1, 6.8.0-1041.47+1, 6.8.0-1041.47~22.04.1, 6.8.0-1042.45, 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, 6.14.0-22.22, 6.14.0-1004.4, 6.14.0-1007.7, 6.14.0-1008.8
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-86.87~22.04.1
linux-azure-nvidia (Ubuntu package) - update to 6.8.0-1029.32
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1038.39~22.04.1
linux-gcp-6.8 (Ubuntu package) - addressed in versions 6.8.0-1038.43, 6.8.0-1041.44, 6.8.0-1041.44.1, 6.8.0-1041.44~22.04.2, 6.8.0-1042.45~22.04.1
linux-aws-6.8 (Ubuntu package) - update to 6.8.0-1041.43~22.04.1
linux-raspi (Ubuntu package) - update to 6.8.0-1041.45
linux-azure-fips (Ubuntu package) - update to 6.8.0-1044.50+fips1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2032.33
linux-realtime (Ubuntu package) - addressed in versions 6.8.1-1036.37, 6.8.1-1036.37~22.04.1
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1015.16, 6.11.0-1015.16~24.04.2
linux-azure (Ubuntu package) - addressed in versions 6.11.0-1018.18, 6.11.0-1018.18~24.04.1, 6.14.0-1007.7
linux-oem-6.11 (Ubuntu package) - update to 6.11.0-1024.24
linux-aws (Ubuntu package) - addressed in versions 6.14.0-1007.7, 6.14.0-1007.7+1

External References

Related Security Bulletins