{"id":"CVE-2020-36311","title":"An issue was discovered in the Linux kernel before 5.9","summary":"An issue was discovered in the Linux kernel before 5.9. arch/x86/kvm/svm/sev.c allows attackers to cause a denial of service (soft lockup) by triggering destruction of a large SEV VM (which requires unregistering many encrypted regions),…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 5.9.0","debian_linux = 9.0","debian_linux = 10.0"],"patched":["linux_kernel 5.9.0"],"published":"2021-04-07","updated":"2026-10-08","sourceUpdated":"2026-10-08T21:17:29.923","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2020-36311","references":[{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9","label":"cve@mitre.org"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7be74942f184fdfba34ddd19a0d995deb34d4a03","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html","label":"cve@mitre.org"},{"url":"https://www.debian.org/security/2021/dsa-4941","label":"cve@mitre.org"},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7be74942f184fdfba34ddd19a0d995deb34d4a03","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2021/dsa-4941","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-36311.json"},{"url":"https://access.redhat.com/security/cve/CVE-2020-36311"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1947994"},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-36311"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36311"}],"tags":["nvd","csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00335,"epssPercentile":0.26774,"ingestedAt":"2026-10-08T22:11:53.731Z","scores":{"nvd":5.5,"vendor":2.8},"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-08T21:00:35.710173Z"},"slug":"CVE-2020-36311","body":"## Overview\n\nAn issue was discovered in the Linux kernel before 5.9. arch/x86/kvm/svm/sev.c allows attackers to cause a denial of service (soft lockup) by triggering destruction of a large SEV VM (which requires unregistering many encrypted regions), aka CID-7be74942f184.\n\n## Affected\n\n- `linux_kernel < 5.9.0`\n- `debian_linux = 9.0`\n- `debian_linux = 10.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.9.0`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 8 · no fix planned: Red Hat Enterprise Linux 8 · updated 2026-10-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-36311.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}