SB2025080622 - Remote denial of service in Linux kernel ksmbd
Published: August 6, 2025
Security Bulletin ID
SB2025080622
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Memory leak (CVE-ID: CVE-2023-32255)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak within the smb2_sess_setup() function in fs/ksmbd/smb2pdu.c of the ksmbd component. A remote attacker can send a session setup request with unknown NTLMSSP message type and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.