CVE-2018-14678

HIGH
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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://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

Details

Source: MITRE

Published: 2018-07-28

Updated: 2019-10-03

Type: CWE-665

Risk Information

CVSS v2

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

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

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to 4.17.11 (inclusive)

Configuration 2

OR

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* versions up to 4.11.0 (inclusive)

Configuration 3

OR

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Tenable Plugins

View all (10 total)

IDNameProductFamilySeverity
123679Ubuntu 14.04 LTS / 16.04 LTS : linux-hwe, linux-aws-hwe, linux-azure, linux-gcp, linux-oracle (USN-3931-2)NessusUbuntu Local Security Checks
high
123678Ubuntu 18.04 LTS : linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-oracle, (USN-3931-1)NessusUbuntu Local Security Checks
high
120794Fedora 28 : kernel / kernel-headers (2018-cc812838fb)NessusFedora Local Security Checks
high
118053Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2018-4242) (Foreshadow)NessusOracle Linux Local Security Checks
high
118034SUSE SLES12 Security Update : kernel (SUSE-SU-2018:3084-1)NessusSuSE Local Security Checks
high
117908Debian DLA-1531-1 : linux-4.9 security updateNessusDebian Local Security Checks
high
117862Debian DSA-4308-1 : linux - security updateNessusDebian Local Security Checks
high
117378Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2018-4210) (Foreshadow)NessusOracle Linux Local Security Checks
high
117377OracleVM 3.4 : Unbreakable / etc (OVMSA-2018-0254) (Foreshadow)NessusOracleVM Local Security Checks
high
111539Fedora 27 : kernel / kernel-headers (2018-49bda79bd5)NessusFedora Local Security Checks
high