Bug 1225805 (CVE-2024-36922)

Summary:	VUL-0: CVE-2024-36922: kernel: wifi: iwlwifi: read txq->read_ptr under lock
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	andrea.mattiazzo, vasant.karasulli
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/408221/
Whiteboard:	CVSSv3.1:SUSE:CVE-2024-36922:4.7:(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 2024-06-03 07:46:02 UTC

In the Linux kernel, the following vulnerability has been resolved:

wifi: iwlwifi: read txq->read_ptr under lock

If we read txq->read_ptr without lock, we can read the same
value twice, then obtain the lock, and reclaim from there
to two different places, but crucially reclaim the same
entry twice, resulting in the WARN_ONCE() a little later.
Fix that by reading txq->read_ptr under lock.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36922
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-36922.mbox
https://git.kernel.org/stable/c/b83db8e756dec68a950ed2f056248b1704b3deaa
https://git.kernel.org/stable/c/43d07103df670484cdd26f9588eabef80f69db89
https://git.kernel.org/stable/c/c2ace6300600c634553657785dfe5ea0ed688ac2
https://www.cve.org/CVERecord?id=CVE-2024-36922

Comment 2 Takashi Iwai 2024-06-13 13:53:18 UTC

SLE15-SP6 branch already contains the fix backport.

The relevant code doesn't present on SLE15-SP5 and older kernels.

Comment 3 Andrea Mattiazzo 2024-06-14 09:49:10 UTC

All done, closing.