[arch-security] [ASA-201610-14] linux: privilege escalation

[Levente Polyak]

Arch Linux Security Advisory ASA-201610-14
==========================================

Severity: High
Date    : 2016-10-22
CVE-ID  : CVE-2016-5195
Package : linux
Type    : privilege escalation
Remote  : No
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package linux before version 4.8.3-1 is vulnerable to privilege
escalation.

Resolution
==========

Upgrade to 4.8.3-1.

# pacman -Syu "linux>=4.8.3-1"

The problem has been fixed upstream in version 4.8.3.

Workaround
==========

None.

Description
===========

A race condition was found in the way the Linux kernel's memory
subsystem handled the copy-on-write (COW) breakage of private read-only
memory mappings. An unprivileged local user could use this flaw to gain
write access to otherwise read-only memory mappings and thus increase
their privileges on the system.

Impact
======

An unprivileged local attacker is able to elevate their privileges on
the system and gain root access.

References
==========

https://bugzilla.redhat.com/show_bug.cgi?id=1384344
https://github.com/dirtycow/dirtycow.github.io/wiki/VulnerabilityDetails
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=19be0eaffa3ac7d8eb6784ad9bdbc7d67ed8e619
https://access.redhat.com/security/cve/CVE-2016-5195

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