Xen 3.3.x through 4.5.x and the Linux kernel through 3.19.1 do not properly restrict access to PCI command registers, which might allow local guest OS users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2150
Reference (s):
- BID:73014
- URL: http://www.securityfocus.com/bid/73014
- BUGTRAQ:20190813 [SECURITY] [DSA 4497-1] linux security update
- URL: https://seclists.org/bugtraq/2019/Aug/18
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=af6fc858a35b90e89ea7a7ee58e66628c55c776b