Privilege escalation in Linux kernel SMB support



| Updated: 2025-05-14
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-52479
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: #VU88818

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-2023-52479

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 smb20_oplock_break_ack() function in fs/ksmbd/smb2pdu.c and fs/smb/server/smb2pdu.c. A local user can trigger a use-after-free error and escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.15 - 6.6 rc6

CPE2.3 External links

https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd
https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930
https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9
https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.135
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.57
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.7
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6


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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