CVE-2018-14678 Information

Description

An issue was discovered in the Linux kernel through 4.17.11 as used in Xen through 4.11.x. The xen_failsafe_callback entry point in arch/x86/entry/entry_64.S does not properly maintain RBX which allows local users to cause a denial of service (uninitialized memory usage and system crash). Within Xen 64-bit x86 PV Linux guest OS users can trigger a guest OS crash or possibly gain privileges.

CVSS Vector

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

Reference

http://www.securityfocus.com/bid/104924 http://www.securitytracker.com/id/1041397 https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html https://usn.ubuntu.com/3931-1/ https://usn.ubuntu.com/3931-2/ https://www.debian.org/security/2018/dsa-4308 https://xenbits.xen.org/xsa/advisory-274.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8