Bug 1614057 (CVE-2018-5953)

Summary:	CVE-2018-5953 kernel: Information Exposure through dmesg data from a "software IO TLB" printk call
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abhgupta, airlied, aquini, bhu, blc, bmcclain, 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, skozina, slawomir, steved, sthangav, trankin, vdronov, williams, ylavi
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel where the swiotlb_print_info() function in lib/swiotlb.c allows local users to obtain some kernel address information by reading the kernel log (dmesg). This address is not useful to commit a further attack.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-08-09 16:08:31 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:	1614058

Description Laura Pardo 2018-08-08 22:07:57 UTC

A flaw was found in the Linux kernel that swiotlb_print_info() function in lib/swiotlb.c allows local users to obtain some kernel address information by reading the kernel log (dmesg). This address is not useful to commit a further attack.

References:

https://github.com/johnsonwangqize/cve-linux/blob/master/%20CVE-2018-5953.md

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad67b74d2469d

Comment 3 Vladis Dronov 2018-08-09 16:08:31 UTC

Notes:

The kernel addresses revealed in the kernel log are of the kernel objects which are allocated dynamically and does not give an information about the kernel code or objects location and so are useless for a possible attacker.