CVE-2016-7777
medium
CVSS v3
6.3
CVSS v4 NEW
—
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
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.8.0~rc3-1 |
| sid | Fixed | 4.8.0~rc3-1 |
| forky | Fixed | 4.8.0~rc3-1 |
| bullseye | Fixed | 4.8.0~rc3-1 |
| bookworm | 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
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.