CVE-2016-7777
medium
CVSS v3
6.3
CVSS v2
3.3
VIR risk
6.3
Description
Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.
Predictions
Exploit likelihood
63%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2016-7777
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2016-7777.html
Vendor advisory: cve@mitre.org — http://xenbits.xen.org/xsa/advisory-190.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 4.8.0~rc3-1 |
| debian | bullseye | fixed | 4.8.0~rc3-1 |
| debian | forky | fixed | 4.8.0~rc3-1 |
| debian | sid | fixed | 4.8.0~rc3-1 |
| debian | trixie | fixed | 4.8.0~rc3-1 |
References
- http://www.securityfocus.com/bid/93344
- http://www.securitytracker.com/id/1036942
- http://xenbits.xen.org/xsa/advisory-190.html
- https://security.gentoo.org/glsa/201611-09
- https://support.citrix.com/article/CTX217363
- https://www.suse.com/security/cve/CVE-2016-7777.html
- https://security-tracker.debian.org/tracker/CVE-2016-7777
CWEs
CWE-362
Verify integrity in audit chain (admin only). AS-IS.