Double free in Linux kernel - CVE-2025-21955
Published: April 2, 2025 / Updated: May 11, 2025
Vulnerability identifier: #VU106810
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-2025-21955
CWE-ID: CWE-415
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 a double free error within the handle_ksmbd_work() and queue_ksmbd_work() functions in fs/smb/server/server.c, within the __smb2_oplock_break_noti(), smb2_oplock_break_noti(), __smb2_lease_break_noti() and smb2_lease_break_noti() functions in fs/smb/server/oplock.c, within the ksmbd_conn_init_server_callbacks() function in fs/smb/server/connection.c. A local user can perform a denial of service (DoS) attack.
How to mitigate CVE-2025-21955
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/09aeab68033161cb54f194da93e51a11aee6144b
- https://git.kernel.org/stable/c/3aa660c059240e0c795217182cf7df32909dd917
- https://git.kernel.org/stable/c/a4261bbc33fbf99b99c80aa3a2c5097611802980
- https://git.kernel.org/stable/c/f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.8