Buffer overflow in Linux kernel smb server

1) Buffer overflow

EUVDB-ID: #VU103138

Risk: Low

CVSSv4.0: 4.3 [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-2025-21660

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory corruption within the ksmbd_vfs_kern_path_locked() function in fs/smb/server/vfs.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/13e41c58c74baa71f34c0830eaa3c29d53a6e964
https://git.kernel.org/stable/c/2ac538e40278a2c0c051cca81bcaafc547d61372
https://git.kernel.org/stable/c/51669f4af5f7959565b48e55691ba92fabf5c587
https://git.kernel.org/stable/c/65b31b9d992c0fb0685c51a0cf09993832734fc4

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.