CVE-2018-14678

HIGH

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.

References

http://www.securityfocus.com/bid/104924

http://www.securitytracker.com/id/1041397

https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html

https://www.debian.org/security/2018/dsa-4308

https://xenbits.xen.org/xsa/advisory-274.html

Details

Source: MITRE

Published: 2018-07-28

Updated: 2019-03-14

Type: CWE-264

Risk Information

CVSS v2.0

Base Score: 7.2

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

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3.0

Base Score: 7.8

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

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH