Memory corruption in Linux kernel - CVE-2023-52440
Published: June 20, 2024 / Updated: September 19, 2025
Vulnerability identifier: #VU92398
CSH Severity: Low
CVSS v4: 8.5 [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]
CVE-ID: CVE-2023-52440
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to memory corruption error within the ksmbd_decode_ntlmssp_auth_blob() function in fs/ksmbd/auth.c. A local user can execute arbitrary code.
Affected software
Linux kernel
How to mitigate CVE-2023-52440
Install update from vendor's repository.
Linux kernel - addressed in versions 5.15.145, 6.1.52, 6.4.15, 6.5.2, 6.6
Links to Public Exploits and PoC-codes
External References
- https://git.kernel.org/stable/c/bd554ed4fdc3d38404a1c43d428432577573e809
- https://git.kernel.org/stable/c/30fd6521b2fbd9b767e438e31945e5ea3e3a2fba
- https://git.kernel.org/stable/c/7f1d6cb0eb6af3a8088dc24b7ddee9a9711538c4
- https://git.kernel.org/stable/c/ecd7e1c562cb08e41957fcd4b0e404de5ab38e20
- https://git.kernel.org/stable/c/4b081ce0d830b684fdf967abc3696d1261387254
- 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-6.1.52
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.2
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6