CVE-2018-16882
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.4%
exploitation probability
0.4%top 71% of all CVEs
observed exploitation
nono source reports it
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:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:H
Affected products
The Linux Foundation · kernel:References
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882https://lwn.net/Articles/775720/https://lwn.net/Articles/775721/https://marc.info/?l=kvm&m=154514994222809&w=2https://support.f5.com/csp/article/K80557033https://usn.ubuntu.com/3871-1/https://usn.ubuntu.com/3871-3/https://usn.ubuntu.com/3871-4/https://usn.ubuntu.com/3871-5/https://usn.ubuntu.com/3872-1/https://usn.ubuntu.com/3878-1/https://usn.ubuntu.com/3878-2/