CVE-2015-7837

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-09-19 · updated 2026-06-17
Weakness: CWE-254

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.

Affected products

Red Hat Enterprise Linux: 7.0, 7.2, 7.3
RedHat Enterprise Linux Desktop: 7.0
RedHat Enterprise Linux Server Aus: 7.3, 7.4
RedHat Enterprise Linux Workstation: 7.0
RedHat Enterprise Mrg: 2.0
RedHat Kernel-Rt: 7.0

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
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

Get alerted when CVE-2015-7837 or the next vulnerability affects your stack