VDB
CVE-2018-15468
CVE-2018-15468
PUBLISHED
CVSS 6 MEDIUM
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.
EPSS 0.34% · 24.6th percentile
Risk Scores
CVSS 3.0
6
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
EPSS Score
0.34%
24.6th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:18.04:LTS | xen | 0, 4.9.0-0ubuntu4, 4.9.2-0ubuntu1 |
| Ubuntu:16.04:LTS | xen | 4.6.0-1ubuntu2, 4.6.0-1ubuntu4, 4.6.0-1ubuntu4.1 |
Timeline
- Aug 17, 2018 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 25, 2021 EPSS Score
- Oct 27, 2021 EPSS Score
- Dec 30, 2021 EPSS Score
- Mar 3, 2022 EPSS Score
- May 5, 2022 EPSS Score
- Jul 7, 2022 EPSS Score
- Sep 9, 2022 EPSS Score
- Nov 11, 2022 EPSS Score
- Jan 13, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2018-15468 third-party-advisory
- https://xenbits.xen.org/xsa/advisory-269.html third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2018-15468 third-party-advisory