Bug 1541240 (CVE-2018-6412)

Summary:	CVE-2018-6412 kernel: Incorrect integer signedness in sbuslibc:sbusfb_ioctl_helper() allows for information leakage
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, esammons, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mguzik, mjg59, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, skozina, steved, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	In the function sbusfb_ioctl_helper() in drivers/video/fbdev/sbuslib.c in the Linux kernel, up to and including 4.15, an integer signedness error allows arbitrary information leakage for the FBIOPUTCMAP_SPARC and FBIOGETCMAP_SPARC commands.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-02-14 16:12:12 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:	1541241
Bug Blocks:	1541243

Description Sam Fowler 2018-02-02 04:34:20 UTC

In the function sbusfb_ioctl_helper() in drivers/video/fbdev/sbuslib.c in the Linux kernel up to and including 4.15, an integer signedness error allows arbitrary information leakage for the FBIOPUTCMAP_SPARC and FBIOGETCMAP_SPARC commands.

External References:
https://nvd.nist.gov/vuln/detail/CVE-2018-6412

Upstream Patch:
https://marc.info/?l=linux-fbdev&m=151734425901499

Comment 1 Sam Fowler 2018-02-02 04:35:11 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1541241]

Comment 2 Justin M. Forbes 2018-02-02 14:28:51 UTC

Sparc is not a supported architecture for Fedora, so this does not impact Fedora users

Comment 5 Vladis Dronov 2018-02-14 16:12:12 UTC

Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE, as the code with the flaw is not built and is not shipped with the products listed.