A flaw was found in the Linux kernel in the NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel id and cause a use-after-free. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.
A proposed patchset:
Name: Vasily Averin (Virtuozzo), Evgenii Shatokhin (Virtuozzo)
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1660825]