This update for xen fixes the following issues: - CVE-2019-19581: Fixed a potential out of bounds on 32-bit Arm . - CVE-2019-19582: Fixed a potential infinite loop when x86 accesses to bitmaps with a compile time known size of 64 . - CVE-2019-19583: Fixed improper checks which could have allowed HVM/PVH guest userspace code to crash the guest,leading to a guest denial of service . - CVE-2019-19578: Fixed an issue where a malicious or buggy PV guest could have caused hypervisor crash resulting in denial of service affecting the entire host . - CVE-2019-19580: Fixed a privilege escalation where a malicious PV guest administrator could have been able to escalate their privilege to that of the host . - CVE-2019-19577: Fixed an issue where a malicious guest administrator could have caused Xen to access data structures while they are being modified leading to a crash . - CVE-2019-19579: Fixed a privilege escaltion where an untrusted domain with access to a physical device can DMA into host memory . - CVE-2019-18420: Malicious x86 PV guests may have caused a hypervisor crash, resulting in a denial of service - CVE-2019-18425: 32-bit PV guest user mode could elevate its privileges to that of the guest kernel. - CVE-2019-18421: A malicious PV guest administrator may have been able to escalate their privilege to that of the host. - CVE-2019-18423: A malicious guest administrator may cause a hypervisor crash, resulting in a denial of service . - CVE-2019-18422: A malicious ARM guest might contrive to arrange for critical Xen code to run with interrupts erroneously enabled. This could lead to data corruption, denial of service, or possibly even privilege escalation. However a precise attack technique has not been identified. - CVE-2019-18424: An untrusted domain with access to a physical device can DMA into host memory, leading to privilege escalation. - CVE-2018-12207: Untrusted virtual machines on Intel CPUs could exploit a race condition in the Instruction Fetch Unit of the Intel CPU to cause a Machine Exception during Page Size Change, causing the CPU core to be non-functional. - CVE-2019-11135: Aborting an asynchronous TSX operation on Intel CPUs with Transactional Memory support could be used to facilitate sidechannel information leaks out of microarchitectural buffers, similar to the previously described quot;Microarchitectural Data Samplingquot; attack. .