Bug 1623614 (CVE-2018-6555)

Summary:	CVE-2018-6555 kernel: irda: use-after-free vulnerability in the hashbin list
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:	abhgupta, airlied, aquini, bhu, blc, bskeggs, dbaker, dhoward, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jokerman, jonathan, josef, jross, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, security-response-team, skozina, steved, sthangav, trankin, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	The irda_setsockopt function in net/irda/af_irda.c in the Linux kernel, through 4.16, allows local users to cause a denial of service (due to a use-after-free of the ias_object and a system crash) or possibly have unspecified other impact by leveraging an AF_IRDA socket.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-08-30 12:18:10 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:
Bug Blocks:	1623611

Description Pedro Sampaio 2018-08-29 18:09:23 UTC

he irda_setsockopt() function conditionally allocates memory for a new
self->ias_object or, in some cases, reuses the existing
self->ias_object. Existing objects were incorrectly reinserted into the
LM_IAS database which corrupted the doubly linked list used for the
hashbin implementation of the LM_IAS database. When combined with a
memory leak in irda_bind(), this issue could be leveraged to create a
use-after-free vulnerability in the hashbin list.

References:

https://seclists.org/oss-sec/2018/q3/212

Suggested patches:

https://www.spinics.net/lists/stable/msg255033.html

https://www.spinics.net/lists/stable/msg255029.html

Comment 5 Vladis Dronov 2018-08-30 12:18:10 UTC

Notes:

None of the Red Hat's products are vulnerable to this flaw.