CVE-2021-28708

PoD operations on misaligned GFNs This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE. x86 HVM and PVH guests may be started in populate-on-demand PoD mode, to provide a way for them to later easily have more memory assigne...

FreeBSD -- Xen grant mapping error handling issues

Problem Description: Grant mapping operations often occur in batch hypercalls, where a number of operations are done in a single hypercall, the success or failure of each one reported to the backend driver, and the backend driver then loops over the results, performing follow-up actions based on...

Fedora 31 : xen (2019-6aad703290)

denial of service in findnextbit XSA-307, CVE-2019-19581, CVE-2019-19582 1782211 denial of service in HVM/PVH guest userspace code XSA-308, CVE-2019-19583 1782206 privilege escalation due to malicious PV guest XSA-309, CVE-2019-19578 1782210 Further issues with restartable PV type change operatio...

CVE-2019-19583

An issue was discovered in Xen through 4.12.x allowing x86 HVM/PVH guest OS users to cause a denial of service guest OS crash because VMX VMEntry checks mishandle a certain case. Please see XSA-260 for background on the MovSS shadow. Please see XSA-156 for background on the need for DB...

CVE-2019-19583

An issue was discovered in Xen through 4.12.x allowing x86 HVM/PVH guest OS users to cause a denial of service guest OS crash because VMX VMEntry checks mishandle a certain case. Please see XSA-260 for background on the MovSS shadow. Please see XSA-156 for background on the need for DB...

x86: steal_page violates page_struct access discipline

ISSUE DESCRIPTION Xen's reference counting rules were designed to allow pages to change owner and state without requiring a global lock. Each page has a page structure, and a very specific set of access disciplines must be observed to ensure that pages are freed properly, and that no writable...