Bug 1168831 – VUL-1: CVE-2020-11565: kernel-source: out-of-bounds write due to improper handling of an empty nodelist during mount option parsing

Bug 1168831 - (CVE-2020-11565) VUL-1: CVE-2020-11565: kernel-source: out-of-bounds write due to improper handling of an empty nodelist during mount option parsing

(CVE-2020-11565)
Summary:	VUL-1: CVE-2020-11565: kernel-source: out-of-bounds write due to improper han...

Status:	RESOLVED INVALID

Classification:	Novell Products
Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents
Version:	unspecified
Hardware:	Other Other

Priority:	P3 - Medium Severity: Normal
Target Milestone:	---
Assigned To:	Kernel Bugs
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/256525/
Whiteboard:	CVSSv3.1:SUSE:CVE-2020-11565:4.8:(AV...
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Reported:	2020-04-07 08:46 UTC by Alexandros Toptsoglou
Modified:	2020-06-10 16:03 UTC (History)
CC List:	5 users (show)

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Found By:	Security Response Team
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Description Alexandros Toptsoglou 2020-04-07 08:46:33 UTC

CVE-2020-11565

An issue was discovered in the Linux kernel through 5.6.2. mpol_parse_str in
mm/mempolicy.c has a stack-based out-of-bounds write because an empty nodelist
is mishandled during mount option parsing, aka CID-aa9f7d5172fa.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-11565
https://github.com/torvalds/linux/commit/aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11565
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=aa9f7d5172fac9bf1f09e678c35e287a40a7b7dd

Comment 1 Michal Hocko 2020-04-07 09:04:55 UTC

While the issue is real, this requires root to mount the tmpfs. So what is the security aspect of this bug?

Comment 2 Alexandros Toptsoglou 2020-04-07 11:39:53 UTC

Tracked as affected as back as 2.6.32

Comment 3 Borislav Petkov 2020-05-16 08:03:02 UTC

This here says that this has been disputed in the meantime:

https://security-tracker.debian.org/tracker/CVE-2020-11565

Comment 4 Alexandros Toptsoglou 2020-05-27 07:23:24 UTC

Disputed