Use-after-free in Linux kernel smb server

1) Use-after-free

EUVDB-ID: #VU108237

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-2025-37776

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the free_opinfo(), opinfo_get_list(), opinfo_put(), opinfo_add(), opinfo_del() and smb_break_all_levII_oplock() functions in fs/smb/server/oplock.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.14 - 6.14.3

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:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/18b4fac5ef17f77fed9417d22210ceafd6525fc7
https://git.kernel.org/stable/c/296cb5457cc6f4a754c4ae29855f8a253d52bcc6
https://git.kernel.org/stable/c/d54ab1520d43e95f9b2e22d7a05fc9614192e5a5
https://git.kernel.org/stable/c/d73686367ad68534257cd88a36ca3c52cb8b81d8
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14.4

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.