CVE-2017-7518 Detail

Current Description

A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.8 HIGH
Vector:  CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Nist CVSS score does not match with CNA score
CNA:  Red Hat, Inc.
Base Score:  5.5 MEDIUM
Vector:  CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.openwall.com/lists/oss-security/2017/06/23/5 Mailing List  Patch  Third Party Advisory 
http://www.securityfocus.com/bid/99263 Third Party Advisory  VDB Entry 
http://www.securitytracker.com/id/1038782 Third Party Advisory  VDB Entry 
https://access.redhat.com/articles/3290921 Permissions Required  Third Party Advisory 
https://access.redhat.com/errata/RHSA-2018:0395 Third Party Advisory 
https://access.redhat.com/errata/RHSA-2018:0412 Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518 Issue Tracking  Patch  Third Party Advisory 
https://usn.ubuntu.com/3619-1/ Third Party Advisory 
https://usn.ubuntu.com/3619-2/ Third Party Advisory 
https://usn.ubuntu.com/3754-1/ Third Party Advisory 
https://www.debian.org/security/2017/dsa-3981 Third Party Advisory 
https://www.spinics.net/lists/kvm/msg151817.html Mailing List  Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-755 Improper Handling of Exceptional Conditions cwe source acceptance level NIST  
CWE-250 Execution with Unnecessary Privileges Reference acceptance level Red Hat, Inc.  

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-7518
NVD Published Date:
07/30/2018
NVD Last Modified:
10/09/2019
Source:
Red Hat, Inc.