{"schemaVersion":3,"id":"USN-5082-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"linux-oem-5.13 vulnerabilities\n\nMaxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor\nimplementation for AMD processors in the Linux kernel allowed a guest VM to\ndisable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a\nguest VM could use this to read or write portions of the host's physical\nmemory. (CVE-2021-3656)\n\nMaxim Levitsky discovered that the KVM hypervisor implementation for AMD\nprocessors in the Linux kernel did not properly prevent a guest VM from\nenabling AVIC in nested guest VMs. An attacker in a guest VM could use this\nto write to portions of the host's physical memory. (CVE-2021-3653)\n\nNorbert Slusarek discovered a race condition in the CAN BCM networking\nprotocol of the Linux kernel leading to multiple use-after-free\nvulnerabilities. A local attacker could use this issue to execute arbitrary\ncode. (CVE-2021-3609)","dates":{"published":"2021-09-16T16:49:22.000Z","modified":"2026-06-03T13:34:03.421Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"linux-oem-5.13","name":"linux-oem-5.13","label":"linux-oem-5.13","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux-oem-5.13","purlType":"deb","versions":[{"text":"< 5.13.0-1012.16","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13.0-1012.16","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-5082-1","label":"ubuntu.com/security/notices/USN-5082-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-3609","label":"ubuntu.com/security/CVE-2021-3609","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-3653","label":"ubuntu.com/security/CVE-2021-3653","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-3656","label":"ubuntu.com/security/CVE-2021-3656","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2021-3609","CVE-2021-3653","CVE-2021-3656"],"downstream":[],"duplicates":[],"related":["CVE-2021-3609","CVE-2021-3653","CVE-2021-3656"]},"timeline":[{"kind":"published","date":"2021-09-16T16:49:22.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-03T13:34:03.421Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T17:21:43.488Z","stale":false,"partial":false}}