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.
References
Link | Resource |
---|---|
http://xenbits.xen.org/xsa/advisory-269.html | Vendor Advisory |
https://security.gentoo.org/glsa/201810-06 | Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: mitre
Published: 2018-08-17T17:00:00
Updated: 2018-10-31T09:57:01
Reserved: 2018-08-17T00:00:00
Link: CVE-2018-15468
JSON object: View
NVD Information
Status : Analyzed
Published: 2018-08-17T18:29:00.740
Modified: 2019-10-03T00:03:26.223
Link: CVE-2018-15468
JSON object: View
Redhat Information
No data.
CWE