Note:
This project will be discontinued after December 13, 2021. [more]
2019-01-03
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.
Products | Ubuntu_linux, Linux_kernel |
Type | Use After Free (CWE-416) |
First patch | - None (likely due to unavailable code) |
Links |
• https://usn.ubuntu.com/3871-3/
• https://usn.ubuntu.com/3871-1/ • https://usn.ubuntu.com/3871-5/ • https://lwn.net/Articles/775721/ • http://www.securityfocus.com/bid/106254
• https://marc.info/?l=kvm&m=154514994222809&w=2
• https://lwn.net/Articles/775720/ • https://usn.ubuntu.com/3871-4/ • https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882 • https://usn.ubuntu.com/3878-2/ • https://usn.ubuntu.com/3872-1/ • https://support.f5.com/csp/article/K80557033 • https://usn.ubuntu.com/3878-1/ |