CVE-2018-16882

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.

CVSS Version 3.1

nvd

CVE ID: CVE-2018-16882
Base Score: 8.8
Base Severity: HIGH
Vector String:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Impact Score: 6.0
Exploitability Score: 2.0

CVSS Version 3.0

redhat

CVE ID: CVE-2018-16882
Base Score: 6.1
Base Severity: MEDIUM
Vector String:CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:H

CVSS Version 2.0

nvd

CVE ID: CVE-2018-16882
Base Score: 7.2
Base Severity: HIGH
Vector String:AV:L/AC:L/Au:N/C:C/I:C/A:C

Refrence: NVDMITRE