CWE Code: 416
Vulnerability Type: privilege_escalation
CVSS Score: 7.2
CWE Name:  Use After Free
Summary: 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.
Access Authentication: NONE
Access Complexity: LOW
Access Vector: LOCAL
Impact (C/I/A): COMPLETE/COMPLETE/COMPLETE
Published Date: 2019-01-03
Last Modified Date: 2019-10-09