#VU105050 Integer overflow in Linux kernel - CVE-2025-21748

Vulnerability identifier: #VU105050

Vulnerability risk: Low

CVSSv4.0: 5.9 [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-2025-21748

CWE-ID: CWE-190

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 execute arbitrary code.

The vulnerability exists due to integer overflow within the ksmbd_ipc_spnego_authen_request(), ksmbd_rpc_write() and ksmbd_rpc_ioctl() functions in fs/smb/server/transport_ipc.c. A local user can execute arbitrary code.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13 - 6.13.2

---

External links
https://git.kernel.org/stable/c/760568c1f62ea874e8fb492f9cfa4f47b4b8391e
https://git.kernel.org/stable/c/82f59d64e6297f270311b16b5dcf65be406d1ea3
https://git.kernel.org/stable/c/aab98e2dbd648510f8f51b83fbf4721206ccae45
https://git.kernel.org/stable/c/b4b902737746c490258de5cb55cab39e79927a67
https://git.kernel.org/stable/c/ecb9947fa7c99a77b04d43404c6988a0d326e4a0
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.3

---

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?