CVE-2012-3494

The CVE-2012-3494 issue affects Xen hypervisor code, specifically the set_debugreg hypercall in include/asm-x86/debugreg.h, impacting Xen 4.0–4.2 and Citrix XenServer 6.0.2 and earlier on x86-64. The vulnerability arises when a guest OS user can write to the reserved bits of the DR7 debug control...

Debian DSA-2544-1 : xen - denial of service

Multiple denial of service vulnerabilities have been discovered in Xen, an hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems : - CVE-2012-3494 : It was discovered that setdebugreg allows writes to reserved bits of the DR7 debug control register on amd6...

kernel-xen 3.1.1 does not prevent modification of the CR4 TSC from applications (DoS possible)

Xen 3.1.1 does not prevent modification of the CR4 TSC from applications, which allows pv guests to cause a denial of service crash...