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{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue.", "bugzilla": {"description": "xen: x86 PV guest INVLPG-like flushes may leave stale TLB entries (XSA-286)", "id": "1891089", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1891089"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-772", "details": ["An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique.", "A flaw was found in the Xen hypercalls with INVLPG-like behavior used by x86 PV guests to invalidate TLB entries. This flaw allows a malicious unprivileged guest user to escalate their privileges to the kernel level within the guest."], "mitigation": {"lang": "en:us", "value": "There is no known mitigation for this flaw apart from applying the patch."}, "name": "CVE-2020-27674", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "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-2020-27674\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-27674\nhttps://xenbits.xen.org/xsa/advisory-286.html"], "statement": "This flaw has been rated as having a security impact of Low, and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in the Extended Life Phase of the support and maintenance life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.", "threat_severity": "Low"}