Xen Project VCPUOP_initialise DoS (XSA-296)

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a denial of service vulnerability due to poor handling of an invalid format string in 'hypercallcreatecontinuation'. This function can be reached via a long-running 'VCPUOPinitialise'...

CVE-2019-18420: Use of Externally-Controlled Format String

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOPinitialise hypercall. hypercallcreatecontinuation is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format...

CVE-2015-7812: Undefined Security Weakness

The hypercallcreatecontinuation function in arch/arm/domain.c in Xen 4.4.x through 4.6.x allows local guest users to cause a denial of service host crash via a preemptible hypercall to the multicall interface...