CVE-2018-15468
CVE-2018-15468
This page contains facts from public vulnerability sources. Check the original advisory before updating.
An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.
CVSS 6.0 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
n/a
- Versions
- n/a: Affected
No fix published
xen Debian:12
- Affected ranges
- ECOSYSTEM: < 4.11.1~pre.20180911.5acdd26fdc+dfsg-2
Update to 4.11.1~pre.20180911.5acdd26fdc+dfsg-2
xen Debian:13
- Affected ranges
- ECOSYSTEM: < 4.11.1~pre.20180911.5acdd26fdc+dfsg-2
Update to 4.11.1~pre.20180911.5acdd26fdc+dfsg-2
xen Debian:14
- Affected ranges
- ECOSYSTEM: < 4.11.1~pre.20180911.5acdd26fdc+dfsg-2
Update to 4.11.1~pre.20180911.5acdd26fdc+dfsg-2
xen Ubuntu:16.04:LTS
- Versions
- 4.5.1-0ubuntu1
- 4.5.1-0ubuntu2
- 4.6.0-1ubuntu1
- 4.6.0-1ubuntu2
- 4.6.0-1ubuntu4
- 4.6.0-1ubuntu4.1
- 4.6.0-1ubuntu4.2
- 4.6.0-1ubuntu4.3
- 4.6.5-0ubuntu1
- 4.6.5-0ubuntu1.1
- 4.6.5-0ubuntu1.2
- 4.6.5-0ubuntu1.4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
xen Ubuntu:18.04:LTS
- Versions
- 4.9.0-0ubuntu3
- 4.9.0-0ubuntu4
- 4.9.2-0ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published