Input validation error in Linux kernel - CVE-2025-38325

Vulnerability identifier: #VU112840

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2025-38325

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 alloc_transport() function in fs/smb/server/transport_tcp.c, within the KSMBD_TRANS(), smb_direct_free_transport() and free_transport() functions in fs/smb/server/transport_rdma.c, within the ksmbd_conn_free() function in fs/smb/server/connection.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/3890da762a66191c440b0bd6e3ee45501edbb0c1
• https://git.kernel.org/stable/c/3f3aae77280aad9f5acc6709c596148966f765c7
• https://git.kernel.org/stable/c/a89f5fae998bdc4d0505306f93844c9ae059d50c

• Input validation error in Linux kernel smb server
• 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