Bug 1120258 (CVE-2018-16885) - VUL-0: CVE-2018-16885: kernel-source: kernel: out-of-bound read in memcpy_fromiovecend()
Summary: VUL-0: CVE-2018-16885: kernel-source: kernel: out-of-bound read in memcpy_fro...
Status: RESOLVED INVALID
Alias: CVE-2018-16885
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Normal
Target Milestone: ---
Assignee: Security Team bot
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/221531/
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Reported: 2018-12-22 13:34 UTC by Marcus Meissner
Modified: 2024-07-04 09:14 UTC (History)
6 users (show)

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Found By: Security Response Team
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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.