vulnerability
FreeBSD: VID-53dbd096-ba4d-11e6-ae1b-002590263bf5 (CVE-2016-9385): xen-kernel -- x86 segment base write emulation lacking canonical address checks
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:N/C:N/I:N/A:C) | Dec 4, 2016 | Dec 4, 2016 | Dec 10, 2025 |
Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
Dec 4, 2016
Added
Dec 4, 2016
Modified
Dec 10, 2025
Description
The Xen Project reports: Both writes to the FS and GS register base MSRs as well as the WRFSBASE and WRGSBASE instructions require their input values to be canonical, or a #GP fault will be raised. When the use of those instructions by the hypervisor was enabled, the previous guard against #GP faults (having recovery code attached) was accidentally removed. A malicious guest administrator can crash the host, leading to a DoS.
Solution
freebsd-upgrade-package-xen-kernel
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