Description
Xen, when using x86 Intel processors and the VMX virtualization extension is enabled, does not properly handle cpuid instruction emulation when exiting the VM, which allows local guest users to cause a denial of service (guest crash) via unspecified vectors.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | kernel +11 | 2.6.18-238.19.1.el5 | RHSA-2011:0927 |
Advisories 1
- RHSA-2011:0927 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jan 14, 2026
References
- RHSA-2011:0927 vendor-advisory
- [oss-security] 20110707 CVE-2011-1780, CVE-2011-1936, kernel/xen issues mailing-list