Memory leak in Linux kernel - CVE-2025-39720
Published: September 8, 2025
Vulnerability identifier: #VU114901
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2025-39720
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the smb_send_parent_lease_break_noti(), smb_lazy_parent_lease_break_close() and smb_break_all_levII_oplock() functions in fs/smb/server/oplock.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2025-39720
Install update from vendor's repository.