NULL pointer dereference in Linux kernel - CVE-2025-22037

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Main Vulnerability Database Vulnerabilities #VU107721

NULL pointer dereference in Linux kernel - CVE-2025-22037

Published: April 22, 2025 / Updated: May 10, 2025


Vulnerability identifier: #VU107721
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-2025-22037
CWE-ID: CWE-476
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 NULL pointer dereference within the smb2_handle_negotiate(), alloc_preauth_hash(), smb2_sess_setup() and smb2_session_logoff() functions in fs/smb/server/smb2pdu.c, within the destroy_previous_session() function in fs/smb/server/mgmt/user_session.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-oem-6.11 (Ubuntu package)

How to mitigate CVE-2025-22037

Install update from vendor's website.

Linux kernel - update to 6.12.23
linux (Ubuntu package) - addressed in versions 6.8.0-101.101, 6.8.0-101.101.1, 6.8.0-101.101.1~22.04.1, 6.8.0-101.101~22.04.1, 6.8.0-1031.34, 6.8.0-1044.45, 6.8.0-1048.52, 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-fips (Ubuntu package) - addressed in versions 6.8.0-101.101+fips1, 6.8.0-1048.51+fips1
linux-aws (Ubuntu package) - addressed in versions 6.8.0-1024.25, 6.8.0.1024.25, 6.8.0-1045.45, 6.8.0-1045.45~22.04.1, 6.8.0-1047.50, 6.8.0-1047.50~22.04.1, 6.14.0-1007.7, 6.14.0-1007.7+1
linux-gcp (Ubuntu package) - addressed in versions 6.8.0-1044.45~22.04.1, 6.8.0-1044.49, 6.8.0-1048.51, 6.8.0-1048.51~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1047.50, 6.8.0-1047.50.1, 6.8.0-1047.50~22.04.1
linux-aws-fips (Ubuntu package) - update to 6.8.0-1047.50+fips1
linux-azure-fips (Ubuntu package) - update to 6.8.0-1047.53+fips1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1051.57, 6.11.0-1018.18, 6.11.0-1018.18~24.04.1, 6.14.0-1007.7
linux-azure-6.8 (Ubuntu package) - update to 6.8.0-1051.57~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2038.39
linux-realtime (Ubuntu package) - update to 6.8.1-1042.43
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