Bug 1211536 (CVE-2023-32254)

Summary: VUL-0: CVE-2023-32254: kernel: Linux Kernel ksmbd Tree Connection Race Condition Remote Code Execution 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: Critical    
Priority: P3 - Medium CC: ddiss, meissner, mkoutny, security-team
Version: Current   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/366968/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description Stoyan Manolov 2023-05-19 07:35:39 UTC 
CVE-2023-32254

This vulnerability allows remote attackers to execute arbitrary code 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_TREE_DISCONNECT commands.
The issue results from the lack of proper locking when performing operations on
an object. An attacker can leverage this vulnerability to execute code in the
context of the kernel.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-32254
https://www.zerodayinitiative.com/advisories/ZDI-23-702/
Comment 2 Michal Koutný 2023-05-22 16:30:07 UTC 
https://github.com/torvalds/linux/commit/30210947a343b6b3ca13adc9bfc88e1543e16dd5

(someone gives this CVSS 9.8 :-o)

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