FreeBSD : xen-kernel -- x86 PV guests may be able to mask interrupts (3ae078ca-c7eb-11e6-ae1b-002590263bf5)
Medium Nessus Plugin ID 96058
SynopsisThe remote FreeBSD host is missing a security-related update.
DescriptionThe Xen Project reports :
Certain PV guest kernel operations (page table writes in particular) need emulation, and use Xen's general x86 instruction emulator. This allows a malicious guest kernel which asynchronously modifies its instruction stream to effect the clearing of EFLAGS.IF from the state used to return to guest context.
A malicious guest kernel administrator can cause a host hang or crash, resulting in a Denial of Service.
SolutionUpdate the affected package.