A use-after-free issue was found in the way the Linux...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://marc.info/?l=kvm&m=154514994222809&w=2
- https://usn.ubuntu.com/3872-1/
- https://usn.ubuntu.com/3878-1/
- https://usn.ubuntu.com/3871-5/
- https://usn.ubuntu.com/3878-2/
- https://usn.ubuntu.com/3871-4/
- http://www.securityfocus.com/bid/106254
- https://lwn.net/Articles/775720/
- https://usn.ubuntu.com/3871-1/
- https://lwn.net/Articles/775721/
- https://usn.ubuntu.com/3871-3/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16882
- https://support.f5.com/csp/article/K80557033
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