Input validation error in Linux kernel - CVE-2025-38431

Vulnerability identifier: #VU113336

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-38431

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper input validation within the sizeof() function in fs/smb/client/reparse.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-hwe-6.14 (Ubuntu package)
linux-azure (Ubuntu package)
linux-realtime-6.14 (Ubuntu package)
linux-aws-6.14 (Ubuntu package)
linux-gcp-6.14 (Ubuntu package)

Install update from vendor's repository.

linux (Ubuntu package) - addressed in versions 6.14.0-34.34, 6.14.0-1014.14~24.04.1, 6.14.0-1015.15, 6.14.0-1015.15~24.04.1, 6.14.0-1016.16, 6.14.0-1018.19
linux-hwe-6.14 (Ubuntu package) - update to 6.14.0-34.34~24.04.1
linux-azure (Ubuntu package) - addressed in versions 6.14.0-1007.7+25.10.1, 6.14.0-1014.14, 6.14.0-1014.14~24.04.1
linux-realtime-6.14 (Ubuntu package) - update to 6.14.0-1014.14~24.04.1
linux-aws-6.14 (Ubuntu package) - update to 6.14.0-1015.15~24.04.1
linux-gcp-6.14 (Ubuntu package) - update to 6.14.0-1018.19~24.04.1

• https://git.kernel.org/stable/c/6ddaf7567080c7de2e0c99efca2ee1e6b79beea5
• https://git.kernel.org/stable/c/ff8abbd248c1f52df0c321690b88454b13ff54b2

• Input validation error in Linux kernel smb client
• Ubuntu update for linux-realtime-6.14
• Ubuntu update for linux-azure
• Ubuntu update for linux
• Ubuntu update for linux-aws-6.14
• Ubuntu update for linux-gcp-6.14
• Ubuntu update for linux-hwe-6.14