Bug 1939164 (CVE-2021-28375)

Summary:	CVE-2021-28375 kernel: fastrpc_internal_invoke in drivers/misc/fastrpc.c does not prevent user applications from sending kernel RPC messages
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bhu, blc, bmasney, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mlangsdo, nmurray, ptalbert, qzhao, rkeshri, rvrbovsk, steved, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Kernel 5.1	Doc Type:	If docs needed, set a value
Doc Text:	An issue was discovered in the Linux kernel. Fastrpc_internal_invoke in drivers/misc/fastrpc.c does not prevent user applications from sending kernel RPC messages. This is a related issue to CVE-2019-2308.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-26 23:35:21 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:	1939166
Bug Blocks:	1939167

Description Pedro Sampaio 2021-03-15 17:36:51 UTC

An issue was discovered in the Linux kernel through 5.11.6. fastrpc_internal_invoke in drivers/misc/fastrpc.c does not prevent user applications from sending kernel RPC messages. This is a related issue to CVE-2019-2308.

References:

https://git.kernel.org/linus/20c40794eb85ea29852d7bc37c55713802a543d6
https://lore.kernel.org/stable/YD03ew7+6v0XPh6l@kroah.com/

Comment 1 Pedro Sampaio 2021-03-15 17:37:30 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1939166]

Comment 3 Rohit Keshri 2021-03-16 09:20:06 UTC

Statement:

There was no shipped kernel version were seen affected with this problem. These files are not built in our source code.

Comment 4 Rohit Keshri 2021-03-16 09:20:50 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 7 Product Security DevOps Team 2021-03-26 23:35:21 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-2021-28375