Bug 1616374 (CVE-2018-7754)

Summary:	CVE-2018-7754 kernel: Information Exposure in aoedisk_debugfs_show function in drivers/block/aoe/aoeblk.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abhgupta, acaringi, 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, sfowler, skozina, steved, sthangav, trankin, vdronov, williams, yozone
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 in that the aoedisk_debugfs_show() function in drivers/block/aoe/aoeblk.c allows local users to obtain some kernel address information by reading a debugfs file. This address is not useful to commit a further attack.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-08-23 11:22:08 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:	1616375, 1616376
Bug Blocks:	1616377

Description Laura Pardo 2018-08-15 18:24:36 UTC

A flaw was found in the Linux kernel in that the aoedisk_debugfs_show() function in drivers/block/aoe/aoeblk.c allows local users to obtain some kernel address information by reading a debugfs file. This address is not useful to commit a further attack.

References:

https://github.com/johnsonwangqize/cve-linux/blob/master/CVE-2018-7754.md

The introducing commit:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1cf94797c2bbc514c2bd0892e1774a0a8ca9afdb

Comment 1 Laura Pardo 2018-08-15 18:25:45 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1616376]

Comment 5 Vladis Dronov 2018-08-23 11:22:08 UTC

Notes:

The kernel addresses revealed in the debugfs file are of the kernel objects which are allocated dynamically and does not give an information about the kernel code or the static objects location.

While a possible attacker can still use a leaked address for certain purposes we assess this flaw impact as Low.