Bug 1120258 (CVE-2018-16885)

Summary:	VUL-0: CVE-2018-16885: kernel-source: kernel: out-of-bound read in memcpy_fromiovecend()
Product:	[Novell Products] SUSE Security Incidents	Reporter:	Marcus Meissner <meissner>
Component:	Incidents	Assignee:	Michal Kubeček <mkubecek>
Status:	RESOLVED INVALID	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	bpetkov, bpoirier, mkubecek, smash_bz, tiwai
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/221531/
Whiteboard:
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Marcus Meissner 2018-12-22 13:34:29 UTC

rh#1661503

A flaw was found in the Linux kernel that allows the userspace to call memcpy_fromiovecend() and similar functions with a zero offset and buffer length which causes the read beyond the buffer boundaries, in certain cases causing a memory access fault and a system halt by accessing invalid memory address.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1661503
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-16885

Comment 1 Marcus Meissner 2018-12-22 13:35:21 UTC

https://bugzilla.redhat.com/show_bug.cgi?id=1661503


(In reply to Nicholas Luedtke from comment #3)
> Any more information on this? Fixing commit and/or introducing commit?

Hello, Nicholas,
I apologize for not mentioning previously that this is a RHEL-only bug.

This specific bug is indirectly fixed upstream by UFO removal, and
the buggy memcpy_fromiovecend() (and related functions) are fixed by:

commit 21226abb4e9f14d88238964d89b279e461ddc30c
Author: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri Nov 28 15:48:29 2014 -0500
net: switch memcpy_fromiovec()/memcpy_fromiovecend() users to copy_from_iter()

Comment 4 Marcus Meissner 2019-11-08 16:19:20 UTC

would currently classify as not affected.