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 v4.0: 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-2025-22040
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel

Detailed vulnerability description

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.


How to mitigate CVE-2025-22040

Install update from vendor's website.

Sources