Bug 1946279 (CVE-2021-30002)

Summary:	CVE-2021-30002 kernel: memory leak for large arguments in video_usercopy function in drivers/media/v4l2-core/v4l2-ioctl.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, blc, bmasney, bskeggs, chwhite, crwood, csoriano, dhoward, dvlasenk, fhrbata, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rvrbovsk, steved, tomckay, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Kernel 5.12	Doc Type:	If docs needed, set a value
Doc Text:	A flaw memory leak in the Linux kernel webcam device functionality was found in the way user calls ioctl that triggers video_usercopy function. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-12-03 18:33:18 UTC	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:	1946280, 1954601, 1954602, 1954603, 1954604, 1954605, 1954606
Bug Blocks:	1946281

Description Guilherme de Almeida Suckevicz 2021-04-05 16:45:10 UTC

An issue was discovered in the Linux kernel before 5.11.3 when a webcam device exists. video_usercopy in drivers/media/v4l2-core/v4l2-ioctl.c has a memory leak for large arguments.

Reference:
https://bugzilla.suse.com/show_bug.cgi?id=1184120

Upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fb18802a338b36f675a388fc03d2aa504a0d0899

Comment 1 Guilherme de Almeida Suckevicz 2021-04-05 16:45:48 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1946280]

Comment 2 Justin M. Forbes 2021-04-05 21:27:13 UTC

This was fixed for Fedora with the 5.10.21 stable kernel updates.

Comment 3 Alex 2021-04-28 12:46:37 UTC

External References:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fb18802a338b36f675a388fc03d2aa504a0d0899

Comment 4 Alex 2021-04-28 12:46:39 UTC

Mitigation:

To mitigate this issue, prevent the module v4l2-common from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.

Comment 18 Carlos Soriano 2021-07-14 12:56:54 UTC

Moved all the BZs to V4L, which is maintained by Jarod Wilson

Comment 23 errata-xmlrpc 2022-11-08 09:09:12 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:7444 https://access.redhat.com/errata/RHSA-2022:7444

Comment 24 errata-xmlrpc 2022-11-08 10:08:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:7683 https://access.redhat.com/errata/RHSA-2022:7683

Comment 25 Product Security DevOps Team 2022-12-03 18:33:13 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-30002

Comment 29 errata-xmlrpc 2024-02-07 16:33:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Extended Update Support

Via RHSA-2024:0724 https://access.redhat.com/errata/RHSA-2024:0724