It was discovered that the KVM subsystem in the Linux kernel did not properly keep track of nested levels in guest page tables. A local attacker in a guest VM could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS.
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{ "cves_map": { "ecosystem": "Ubuntu:16.04:LTS", "cves": [ { "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H" }, { "type": "CVSS_V3", "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H" }, { "type": "Ubuntu", "score": "high" } ], "id": "CVE-2017-12188" } ] } }