Incorrect Authorization Affecting xen-devel package, versions <4.10.2_04-3.9.1
Threat Intelligence
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Start learning- Snyk IDSNYK-SLES150-XENDEVEL-2755821
- published14 Apr 2022
- disclosed28 Dec 2018
Introduced: 28 Dec 2018
CVE-2018-15468 (opens in a new tab)How to fix?
Upgrade SLES:15.0 xen-devel to version 4.10.2_04-3.9.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xen-devel package and not the xen-devel package as distributed by SLES.
See How to fix? for SLES:15.0 relevant fixed versions and status.
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.