vhost-net: guest to host kernel escape during migration
A buffer overflow vulnerability was found in the networking virtualization functionality (vhost-net) that could be abused during live migration of virtual machines. A privileged guest user may pass descriptors with invalid length to the host when live migration is underway to crash the host kernel or, potentially, escalate their privileges on the host.
Ploop image could grow over its limits in certain cases.
ploop: resize operation could fail due to an incorrect check in ploop1_allocate().
The warning in mem_cgroup_reparent_charges() was triggered too early and too often in certain cases.
kvm: potential system hang due to an error in mmu_shrink_scan().
nfs: NULL pointer dereference due to an anomalized NFS message sequence.
An attacker, who is able to mount an exported NFS filesystem, is able to trigger a null pointer dereference by using an invalid NFS sequence. This can panic the machine and deny access to the NFS server. Any outstanding disk writes to the NFS server will be lost.
Storage: certain errors in CS caused by power failures were not handled properly.
It was discovered that if a file located on Virtuozzo Storage cluster was reopened, the kernel could reuse its mappings without notifying MDS. As a result, if errors were then detected on a CS, for example, caused by power failures, the userspace components would be unable to handle them properly.
Processes could get stuck in copy_net_ns() forever.
vziolimit: kernel crash due to a division by zero in throttle_charge().
pcompact operation is much slower for the containers on Virtuozzo Storage than for the ones stored locally.