A flaw was found in the way the Linux kernel's vhost driver treated userspace provided log file descriptor when processing the VHOST_SET_LOG_FD ioctl command. The file descriptor was never released and continued to consume kernel memory. A privileged local user with access to the /dev/vhost-net files could use this flaw to create a denial-of-service attack.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1251871]
Red Hat would like to thank Michael S. Tsirkin of Red Hat Engineering for reporting this issue responsibly.
This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5.
This issue has been rated as having Low impact, affects the Linux kernels as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2 and is currently not planned to be addressed in a future updates.