Use-after-free in Linux kernel - CVE-2023-52480
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90249
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-2023-52480
CWE-ID: CWE-416
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 escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the ksmbd_expire_session(), ksmbd_sessions_deregister() and ksmbd_session_lookup() functions in fs/ksmbd/mgmt/user_session.c, within the ksmbd_conn_alloc() function in fs/ksmbd/connection.c. A local user can escalate privileges on the system.
How to mitigate CVE-2023-52480
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f
- https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b
- https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be
- https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.145
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.57
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.7
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6