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{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue.", "bugzilla": {"description": "xen: races with evtchn_reset function (XSA-343)", "id": "1879567", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1879567"}, "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-440->(CWE-125|CWE-787)", "details": ["An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable.", "A flaw was found in Xen. Uses of EVTCHNOP_reset or XEN_DOMCTL_soft_reset can lead to the violation of various internal assumptions leading to an out of bounds memory access or triggering of bug checks. In particular x86 PV guests may be able to elevate their privilege to that of the host. Information leaks cannot be ruled out and host and guest crashes are also possible, leading to a denial of service (DoS). The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."], "mitigation": {"lang": "en:us", "value": "There is no known mitigation for this flaw apart from applying the patch."}, "name": "CVE-2020-25599", "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": "2020-09-22T12:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-25599\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-25599\nhttps://xenbits.xen.org/xsa/advisory-343.html"], "statement": "All Xen versions from 4.4 onwards are vulnerable. Red Hat Enterprise Linux 5 is not affected by this flaw, as it shipped an older version of Xen.", "threat_severity": "Important"}