CVE-2018-16882 Detail

Current Description

A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled. In nested_get_vmcs12_pages(), in case of an error while processing posted interrupt address, it unmaps the 'pi_desc_page' without resetting 'pi_desc' descriptor address, which is later used in pi_test_and_clear_on(). A guest user/process could use this flaw to crash the host kernel resulting in DoS or potentially gain privileged access to a system. Kernel versions before 4.14.91 and before 4.19.13 are vulnerable.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  8.8 HIGH
Vector:  CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Nist CVSS score does not match with CNA score
CNA:  Red Hat, Inc.
Base Score:  6.1 MEDIUM
Vector:  CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:H


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.securityfocus.com/bid/106254 Third Party Advisory  VDB Entry 
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882 Issue Tracking  Patch  Third Party Advisory 
https://lwn.net/Articles/775720/ Third Party Advisory 
https://lwn.net/Articles/775721/ Third Party Advisory 
https://marc.info/?l=kvm&m=154514994222809&w=2 Patch  Third Party Advisory 
https://support.f5.com/csp/article/K80557033 Third Party Advisory 
https://usn.ubuntu.com/3871-1/ Third Party Advisory 
https://usn.ubuntu.com/3871-3/ Third Party Advisory 
https://usn.ubuntu.com/3871-4/ Third Party Advisory 
https://usn.ubuntu.com/3871-5/ Third Party Advisory 
https://usn.ubuntu.com/3872-1/ Third Party Advisory 
https://usn.ubuntu.com/3878-1/ Third Party Advisory 
https://usn.ubuntu.com/3878-2/ Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST   Reference acceptance level Red Hat, Inc.  

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Change History

9 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-16882
NVD Published Date:
01/03/2019
NVD Last Modified:
10/09/2019
Source:
MITRE