CVE-2017-15597
CriticalSummary
An issue was discovered in Xen through 4.9.x related to grant copying code that relied on the incorrect assumption that any grant pin would have a suitable page reference. When such a grant copy operation is performed on a dying domain, this assumption proves wrong, potentially leading to hypervisor memory corruption.
Risk Assessment
A malicious guest administrator can cause host crashes, resulting in Denial of Service. Privilege escalation and information leaks cannot be ruled out.
Recommendation
It is recommended to update the Xen system to the latest version to mitigate the risks associated with this vulnerability and to monitor the environment for unauthorized activities.
Original NVD description (English source)
An issue was discovered in Xen through 4.9.x. Grant copying code made an implication that any grant pin would be accompanied by a suitable page reference. Other portions of code, however, did not match up with that assumption. When such a grant copy operation is being done on a grant of a dying domain, the assumption turns out wrong. A malicious guest administrator can cause hypervisor memory corruption, most likely resulting in host crash and a Denial of Service. Privilege escalation and information leaks cannot be ruled out.