Detections
Analytics
CVE-2018-16882
high
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.
References
https://usn.ubuntu.com/3878-2/
https://usn.ubuntu.com/3878-1/
https://usn.ubuntu.com/3872-1/
https://usn.ubuntu.com/3871-5/
https://usn.ubuntu.com/3871-4/
https://usn.ubuntu.com/3871-3/
https://usn.ubuntu.com/3871-1/
https://support.f5.com/csp/article/K80557033
https://marc.info/?l=kvm&m=154514994222809&w=2
https://lwn.net/Articles/775721/
https://lwn.net/Articles/775720/