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{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Jan Beulich (SUSE) and Julien Grall (Citrix) as the original reporters.", "bugzilla": {"description": "xen: XENMEM_exchange error handling may cause DoS to host", "id": "1284919", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1284919"}, "csaw": false, "cvss": {"cvss_base_score": "6.3", "cvss_scoring_vector": "AV:N/AC:M/Au:S/C:N/I:N/A:C", "status": "draft"}, "cvss3": {"cvss3_base_score": "6.2", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["The memory_exchange function in common/memory.c in Xen 3.2.x through 4.6.x does not properly hand back pages to a domain, which might allow guest OS administrators to cause a denial of service (host crash) via unspecified vectors related to domain teardown.", "A malicious guest administrator may be able to deny service by crashing the host or causing a deadlock by timing memory handling events between the guest and the host."], "mitigation": {"lang": "en:us", "value": "The vulnerability can be avoided if the guest kernel is controlled by the host rather than guest administrator, provided that further steps are taken to prevent the guest administrator from loading code into the kernel (e.g. by disabling loadable modules etc) or from using other mechanisms which allow them to run code at kernel privilege. In Xen HVM, controlling the guest's kernel would involve locking down the bootloader."}, "name": "CVE-2015-8339", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "xen", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2015-12-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-8339\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-8339\nhttp://xenbits.xen.org/xsa/advisory-159.html"], "statement": "This issue does not affect the Linux kernel packages as shipped with Red Hat\nEnterprise Linux 6, 7, MRG-2 and realtime kernels.\nAt this time, there is no plans to fix this issue, if you feel that this issue\nis affecting your deployment and have an EUS subscription, please contact\nsupport to have this issue correctly prioritized", "threat_severity": "Moderate"}

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