Bug 1992779 (CVE-2021-38206)

Summary:	CVE-2021-38206 kernel: NULL pointer dereference in the radiotap parser by injecting a frame with 802.11a rates in mac80211 subsystem
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bhu, chwhite, crwood, dvlasenk, hdegoede, hkrzesin, jarod, jarodwilson, jeremy, jforbes, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, steved, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Linux kernel 5.13-rc7	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found on the Linux kernel. A NULL pointer dereference in the radiotap parser, leading to a denial of service, can occur in the mac80211 subsystem when a device supports only 5 GHz is used and frames with 802.11a rates are injected. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1992781, 1993201, 1993202, 1993203
Bug Blocks:	1992782

Description Guilherme de Almeida Suckevicz 2021-08-11 18:03:34 UTC

The mac80211 subsystem in the Linux kernel before 5.12.13, when a device supporting only 5 GHz is used, allows attackers to cause a denial of service (NULL pointer dereference in the radiotap parser) by injecting a frame with 802.11a rates.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bddc0c411a45d3718ac535a070f349be8eca8d48

Comment 1 Guilherme de Almeida Suckevicz 2021-08-11 18:04:02 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1992781]

Comment 2 Justin M. Forbes 2021-08-12 13:29:40 UTC

This was fixed for Fedora with the 5.12.13 stable kernel updates.