CVE-2015-2150

Published: 12 March 2015

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.

From the Ubuntu Security Team

Jan Beulich discovered the Xen virtual machine subsystem of the Linux kernel did not properly restrict access to PCI command registers. A local guest user could exploit this flaw to cause a denial of service (host crash).

Notes

android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2150
• http://xenbits.xen.org/xsa/advisory-120.html
• http://xenbits.xen.org/xsa/xsa120.patch
• http://xenbits.xen.org/xsa/xsa120-classic.patch
• https://ubuntu.com/security/notices/USN-2589-1
• https://ubuntu.com/security/notices/USN-2590-1
• https://ubuntu.com/security/notices/USN-2613-1
• https://ubuntu.com/security/notices/USN-2614-1
• https://ubuntu.com/security/notices/USN-2631-1
• https://ubuntu.com/security/notices/USN-2632-1
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1430952