SB2025042251 - Use-after-free in Linux kernel smb server
Published: April 22, 2025 Updated: May 11, 2025
Security Bulletin ID
SB2025042251
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-22040)
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.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737
- https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f
- https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd
- https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d
- https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b
- https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.134
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.23
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.11
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14.2
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.87