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{"bugzilla": {"description": "kernel: arch/x86/kvm/mmu/paging_tmpl.h incorrectly computes the access permissions of a shadow page", "id": "1992264", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1992264"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-732", "details": ["arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access permissions of a shadow page, leading to a missing guest protection page fault.", "A flaw was found in the Linux kernel, where it incorrectly computes the access permissions of a shadow page. This issue leads to a missing guest protection page fault."], "mitigation": {"lang": "en:us", "value": "Do not disable hardware-assisted paging (also known as nested paging and Second Level Address Translation) on your hosts. The default is on."}, "name": "CVE-2021-38198", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-06-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-38198\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-38198"], "statement": "The issue is rated as having Low impact because the issue is not present when hardware-assisted paging (also known as nested paging and Second Level Address Translation) is enabled. Hardware-assisted paging is enabled by default for CPUs that support it. Any realistic real-life virtualization scenario benefits greatly from hardware assisted paging speed up, so deployments without hardware-assisted paging are very rare.", "threat_severity": "Low", "upstream_fix": "Linux kernel 5.13-rc6"}