Bug 1211535 (CVE-2023-32253)

Summary: VUL-0: CVE-2023-32253: kernel: Linux Kernel ksmbd Session Deadlock Denial-of-Service Vulnerability
Product: [openSUSE] openSUSE Tumbleweed Reporter: Stoyan Manolov <stoyan.manolov>
Component: KernelAssignee: Security Team bot <security-team>
Status: RESOLVED UPSTREAM QA Contact: E-mail List <qa-bugs>
Severity: Normal    
Priority: P3 - Medium CC: ddiss, meissner, mkoutny, security-team
Version: Current   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/366969/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description Stoyan Manolov 2023-05-19 07:35:19 UTC 
CVE-2023-32253

This vulnerability allows remote attackers to create a denial-of-service
condition on affected installations of Linux Kernel. Authentication is not
required to exploit this vulnerability, but only systems with ksmbd enabled are
vulnerable.

The specific flaw exists within the processing of SMB2_SESSION_SETUP commands.
The issue results from the lack of proper locking when performing operations on
an object. An attacker can leverage this vulnerability to create a
denial-of-service condition on the system.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-32253
https://www.zerodayinitiative.com/advisories/ZDI-23-701/
Comment 2 Michal Koutný 2023-05-22 16:30:05 UTC 
https://github.com/torvalds/linux/commit/7b4323373d844954bb76e0e9f39c4e5fc785fa7b

Possibly needed in the `stable` branch before v6.4 is out.