Bug 1211528 (CVE-2023-32246)

Summary: VUL-0: CVE-2023-32246: kernel: Linux Kernel ksmbd RCU Callback Race Condition Local Privilege Escalation Vulnerability
Product: [openSUSE] openSUSE Tumbleweed Reporter: Stoyan Manolov <stoyan.manolov>
Component: KernelAssignee: Security Team bot <security-team>
Status: RESOLVED UPSTREAM QA Contact: Security Team bot <security-team>
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/366976/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description Stoyan Manolov 2023-05-19 07:31:59 UTC 
CVE-2023-32246

This vulnerability allows local attackers to execute arbitrary code on affected
installations of Linux Kernel. An attacker must first obtain the ability to
execute high-privileged code on the target system in order to exploit this
vulnerability.

The specific flaw exists within the handling of unloading of the ksmbd driver.
The issue results from the lack of proper locking when performing operations on
an object. An attacker can leverage this vulnerability to escalate privileges
and execute code in the context of the kernel.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-32246
https://www.zerodayinitiative.com/advisories/ZDI-23-694/
Comment 2 Michal Koutný 2023-05-22 16:16:39 UTC 
Reassigning to a concrete person to ensure progress [1] (feel free to pass to next one), see also the process at [2].
 
The report translates to
https://github.com/torvalds/linux/commit/eb307d09fe15844fdaebeb8cc8c9b9e925430aa5

Possibly needed in the `stable` branch before v6.4 is out.
 
[1] https://confluence.suse.com/display/KSS/Kernel+Security+Sentinel
[2] https://wiki.suse.net/index.php/SUSE-Labs/Kernel/Security