CVE-2016-9644

high

Description

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.

References

http://www.openwall.com/lists/oss-security/2016/11/07/4

http://www.securityfocus.com/bid/94545

http://www.ubuntu.com/usn/USN-3146-1

http://www.ubuntu.com/usn/USN-3146-2

https://lwn.net/Articles/705220/

Details

Source: MITRE

Published: 2016-11-28

Updated: 2017-01-07

Type: CWE-264

Risk Information

CVSS v2

Base Score: 9.3

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 8.6

Severity: HIGH

CVSS v3

Base Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH