#VU106864 Buffer overflow in Linux kernel - CVE-2025-21994

Vulnerability identifier: #VU106864

Vulnerability 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-2025-21994

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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

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

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13 - 6.13.8

---

External links
https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64
https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675
https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd
https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19
https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.9

---

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?