Improper locking in Linux kernel smb server

1) Improper locking

EUVDB-ID: #VU108808

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-2025-37802

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

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

The vulnerability exists due to improper locking within the tree_conn_fd_check() and ksmbd_durable_scavenger() functions in fs/smb/server/vfs_cache.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.14 - 6.14.4

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:6.14:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.14.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.14.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.14.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.14.4:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/1df0d4c616138784e033ad337961b6e1a6bcd999
https://git.kernel.org/stable/c/8f805b3746d2f41702c77cba22f94f8415fadd1a
https://git.kernel.org/stable/c/cd161198e091e8a62b9bd631be970ea9a87d2d6a
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14.5

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.