This update for xen fixes the following issues:
Security issues fixed:
- Fixed multiple access violations introduced by XENMEM_exchange hypercall which could allow
a single PV guest to leak arbitrary amounts of memory, leading to a denial of service (bsc#1126192).
- Fixed an issue which could allow a malicious unprivileged guest userspace process to escalate its privilege
to that of other userspace processes in the same guest and potentially thereby to that
of the guest operating system (bsc#1126201).
- Fixed an issue which could allow an untrusted PV domain with access to a physical device to DMA into its own
pagetables leading to privilege escalation (bsc#1126195).
- Fixed an issue which could allow a malicious or buggy x86 PV guest kernels can mount a Denial of Service
attack affecting the whole system (bsc#1126196).
- CVE-2019-6778: Fixed a heap buffer overflow in tcp_emu() found in slirp (bsc#1123157).
- Fixed an issue which could allow malicious PV guests may cause a host crash or
gain access to data pertaining to other guests.Additionally, vulnerable configurations
are likely to be unstable even in the absence of an attack (bsc#1126198).
- Fixed an issue which could allow malicious 64bit PV guests to cause a host crash (bsc#1127400).
- Fixed an issue which could allow malicious or buggy guests with passed through PCI devices to be able to
escalate their privileges, crash the host, or access data belonging to other guests. Additionally memory
leaks were also possible (bsc#1126140).
- Fixed a race condition issue which could allow malicious PV guests to escalate their privilege to that
of the hypervisor (bsc#1126141).
- CVE-2019-9824: Fixed an information leak in SLiRP networking implementation which could allow a user/process
to read uninitialised stack memory contents (bsc#1129623).
Other issues fixed:
- Fixed an issue where VMs crashing when migrating between dom0 hosts (bsc#1031382).
- Upstream bug fixes (bsc#1027519)