Vulnerability CVE-2015-7837
Published: 2017-09-19

Description:
The Linux kernel, as used in Red Hat Enterprise Linux 7, kernel-rt, and Enterprise MRG 2 and when booted with UEFI Secure Boot enabled, allows local users to bypass intended securelevel/secureboot restrictions by leveraging improper handling of secure_boot flag across kexec reboot.

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
2.1/10
2.9/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Redhat -> Enterprise linux server aus 
Redhat -> Enterprise linux 
Redhat -> Kernel-rt 
Redhat -> Enterprise linux desktop 
Redhat -> Enterprise linux workstation 
Redhat -> Enterprise mrg 

 References:
http://rhn.redhat.com/errata/RHSA-2015-2152.html
http://rhn.redhat.com/errata/RHSA-2015-2411.html
http://www.openwall.com/lists/oss-security/2015/10/15/6
http://www.securityfocus.com/bid/77097
https://bugzilla.redhat.com/show_bug.cgi?id=1272472
https://github.com/mjg59/linux/commit/4b2b64d5a6ebc84214755ebccd599baef7c1b798
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