Bug 1951739 (CVE-2021-42739)

Summary:	CVE-2021-42739 kernel: Heap buffer overflow in firedtv driver
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
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, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rkeshri, rvrbovsk, steved, tomckay, walters, wcosta, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 3.10.0	Doc Type:	If docs needed, set a value
Doc Text:	A heap-based buffer overflow flaw was found in the Linux kernel FireDTV media card driver, where the user calls the CA_SEND_MSG ioctl. This flaw allows a local user of the host machine to crash the system or escalate privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-10 15:56:18 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:	1956470, 1956471, 1956472, 1956473, 1956474, 1958655, 1965287
Bug Blocks:	1951740, 1958946

Description Pedro Sampaio 2021-04-20 20:07:00 UTC

A heap-based buffer overflow flaw was found in the Linux kernel FireDTV media card driver, where the user calls the CA_SEND_MSG ioctl. This flaw allows a local user of the host machine to crash the system or escalate privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

References:

https://seclists.org/oss-sec/2021/q2/46

Comment 1 Alex 2021-05-03 18:30:15 UTC

External References:

https://lore.kernel.org/linux-media/YHaulytonFcW+lyZ@mwanda/

Comment 3 Alex 2021-05-09 15:00:31 UTC

Mitigation:

To mitigate this issue, prevent the module firedtv 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 7 Rohit Keshri 2021-05-27 11:26:36 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1965287]

Comment 14 errata-xmlrpc 2022-01-11 17:29:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2022:0063 https://access.redhat.com/errata/RHSA-2022:0063

Comment 15 errata-xmlrpc 2022-01-11 17:31:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2022:0065 https://access.redhat.com/errata/RHSA-2022:0065

Comment 16 errata-xmlrpc 2022-05-10 14:38:55 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1975 https://access.redhat.com/errata/RHSA-2022:1975

Comment 17 errata-xmlrpc 2022-05-10 14:44:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1988 https://access.redhat.com/errata/RHSA-2022:1988