The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not initialize a certain integer variable, which allows local users to obtain sensitive information from kernel stack memory by triggering failure of a get_user_ex call.
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.5
http://www.openwall.com/lists/oss-security/2016/11/04/4
http://www.securityfocus.com/bid/94144
https://bugzilla.redhat.com/show_bug.cgi?id=1391908
https://github.com/torvalds/linux/commit/1c109fabbd51863475cd12ac206bdd249aee35af
Source: MITRE
Published: 2016-11-28
Updated: 2016-11-28
Type: CWE-200
Base Score: 2.1
Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 3.9
Severity: LOW
Base Score: 5.5
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Impact Score: 3.6
Exploitability Score: 1.8
Severity: MEDIUM