Vulnerability CVE-2016-1576
Published: 2016-05-02

Description:
The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Linux -> Linux kernel 
Canonical -> Ubuntu core 
Canonical -> Ubuntu linux 
Canonical -> Ubuntu touch 

 References:
https://launchpadlibrarian.net/235300225/0006-overlayfs-Propogate-nosuid-from-lower-and-upper-moun.patch
https://launchpadlibrarian.net/235300093/0005-overlayfs-Be-more-careful-about-copying-up-sxid-file.patch
https://bugs.launchpad.net/bugs/1535150
http://www.openwall.com/lists/oss-security/2016/02/24/8
http://www.halfdog.net/Security/2016/OverlayfsOverFusePrivilegeEscalation/
http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-1576.html
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e9f57ebcba563e0cd532926cab83c92bb4d79360
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