Bug 1226955 (CVE-2024-39292)

Summary: VUL-0: CVE-2024-39292: kernel: um: add winch to winch_handlers before registering winch IRQ
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Security Team bot <security-team>
Status: RESOLVED INVALID QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: camila.matos, mhocko
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/411975/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-39292:4.7:(AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-06-25 12:00:07 UTC 
In the Linux kernel, the following vulnerability has been resolved:

um: Add winch to winch_handlers before registering winch IRQ

Registering a winch IRQ is racy, an interrupt may occur before the winch is
added to the winch_handlers list.

If that happens, register_winch_irq() adds to that list a winch that is
scheduled to be (or has already been) freed, causing a panic later in
winch_cleanup().

Avoid the race by adding the winch to the winch_handlers list before
registering the IRQ, and rolling back if um_request_irq() fails.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-39292
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-39292.mbox
https://git.kernel.org/stable/c/66ea9a7c6824821476914bed21a476cd20094f33
https://git.kernel.org/stable/c/dc1ff95602ee908fcd7d8acee7a0dadb61b1a0c0
https://git.kernel.org/stable/c/351d1a64544944b44732f6a64ed65573b00b9e14
https://git.kernel.org/stable/c/31960d991e43c8d6dc07245f19fc13398e90ead2
https://git.kernel.org/stable/c/0c02d425a2fbe52643a5859a779db0329e7dddd4
https://git.kernel.org/stable/c/434a06c38ee1217a8baa0dd7c37cc85d50138fb0
https://git.kernel.org/stable/c/73b8e21f76c7dda4905655d2e2c17dc5a73b87f1
https://git.kernel.org/stable/c/a0fbbd36c156b9f7b2276871d499c9943dfe5101
https://www.cve.org/CVERecord?id=CVE-2024-39292
Comment 1 Michal Hocko 2024-06-27 12:24:03 UTC 
We do not enable UML