The aio_mount function in fs/aio.c in the Linux kernel before 4.7.7 does not properly restrict execute access, which makes it easier for local users to bypass intended SELinux W^X policy restrictions, and consequently gain privileges, via an io_setup system call.
http://source.android.com/security/bulletin/2017-02-01.html
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.7
http://www.securityfocus.com/bid/96122
http://www.securitytracker.com/id/1037798
https://github.com/torvalds/linux/commit/22f6b4d34fcf039c63a94e7670e0da24f8575a5a
Source: MITRE
Published: 2017-02-07
Updated: 2017-07-25
Type: CWE-264
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH