Use-after-free in Linux kernel smb server



| Updated: 2025-05-21
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-37924
CWE-ID CWE-416
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU109507

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-2025-37924

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 krb5_authenticate() function in fs/smb/server/smb2pdu.c, within the ksmbd_krb5_authenticate() function in fs/smb/server/auth.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.1 - 6.14.5

CPE2.3 External links

https://git.kernel.org/stable/c/28c756738af44a404a91b77830d017bb0c525890
https://git.kernel.org/stable/c/b447463562238428503cfba1c913261047772f90
https://git.kernel.org/stable/c/e18c616718018dfc440e4a2d2b94e28fe91b1861
https://git.kernel.org/stable/c/e34a33d5d7e87399af0a138bb32f6a3e95dd83d2
https://git.kernel.org/stable/c/e86e9134e1d1c90a960dd57f59ce574d27b9a124
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.138
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.28
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14.6
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.90


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.



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