Bug 1919900 (CVE-2020-27830)

Summary:	CVE-2020-27830 kernel: null pointer dereference in in spk_ttyio_receive_buf2
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
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, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jross, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mcressma, mlangsdo, nmurray, ptalbert, qzhao, rt-maint, rvrbovsk, steved, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.9.14	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in Linux Kernel where in the spk_ttyio_receive_buf2() function, it would dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-01-28 14:41:37 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:	1919903
Bug Blocks:	1919902, 1939850

Description Dhananjay Arunesh 2021-01-25 11:39:12 UTC

A vulnerability was found in Linux Kernel, where in the spk_ttyio_receive_buf2() function, it would dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref crash.

References:
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git/commit/?h=char-misc-linus&id=f0992098cadb4c9c6a00703b66cafe604e178fea

Comment 1 Dhananjay Arunesh 2021-01-25 11:41:31 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1919903]

Comment 2 Justin M. Forbes 2021-01-25 17:31:10 UTC

This was fixed for Fedora with the 5.9.14 stable kernel updates.

Comment 3 Product Security DevOps Team 2021-01-28 14:41:37 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-2020-27830