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{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue.", "bugzilla": {"description": "xen: x86: race condition in Xen mapping code (XSA-345)", "id": "1891096", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1891096"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-362", "details": ["An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of service, achieve data corruption, or possibly gain privileges by exploiting a race condition that leads to a use-after-free involving 2MiB and 1GiB superpages.", "A race condition flaw was found in the Xen code responsible for handling the updating of the hypervisor's own page tables. This flaw allows a malicious guest to cause a denial of service, host data corruption, or potential privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability."], "mitigation": {"lang": "en:us", "value": "Running all guests in HVM or PVH mode, in each case with HAP enabled, will prevent those guests from exploiting the vulnerability."}, "name": "CVE-2020-27672", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel-xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2020-10-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-27672\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-27672\nhttps://xenbits.xen.org/xsa/advisory-345.html"], "statement": "All Xen versions from 3.2 onwards are vulnerable. Red Hat Enterprise Linux 5 is not affected by this flaw, as it shipped with an older version of Xen.", "threat_severity": "Moderate"}