CVE-2016-3158 The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive r...
LowCVSS 3.8
EPSS 0.41%
- Published
- Updated
- Exploit status
- No public exploit known
Description
The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| debian/xen(Debian:12) | < 4.8.0~rc3-1 | 4.8.0~rc3-1 |
| debian/xen(Debian:13) | < 4.8.0~rc3-1 | 4.8.0~rc3-1 |
| debian/xen(Debian:14) | < 4.8.0~rc3-1 | 4.8.0~rc3-1 |
| Xen | <= 4.4.0 | No fix listed |
| fedoraproject fedora | = 22 | No fix listed |
| fedoraproject fedora | = 23 | No fix listed |
| oracle vm server | = 3.3 | No fix listed |
| oracle vm server | = 3.4 | No fix listed |
References
- Debian Security Tracker CVE-2016-3158 vendor-advisory
- FEDORA-2016-5f196e4e4a third-party-advisory vendor-advisory
- FEDORA-2016-e5432ca977 third-party-advisory vendor-advisory
- support.citrix.com
- DSA-3554 vendor-advisory
- www.oracle.com vendor-advisory
- 85714 third-party-advisory vdb-entry
- 1035435 third-party-advisory vdb-entry
- xenbits.xen.org vendor-advisory
- xenbits.xen.org patch
- xenbits.xen.org patch
- bugs.debian.org issue-tracking