CVE-2016-7777: xen
Vulnerability summary
CVE-2016-7777 is a medium (CVSS 6.3) vulnerability in xen. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 23% of scored vulnerabilities.
Not severe (CVSS 6.3, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 7Timeline
- 07-10-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated6.3MediumCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- OSV · UbuntuEcosystem advisory · calculated6.3MediumCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- OSV · DebianEcosystem advisory · calculated6.3MediumCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS trend
Probability
0.30%
Chance of exploitation in the next 30 days
Percentile
23%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.30% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- xen< 4.7.0-r5 | < 4.6.3-r3
Debian1 product
- xen< 4.8.0~rc3-1 | < 4.1.6.lts1-3
Ubuntu1 product
- xen< 4.4.2-0ubuntu0.14.04.7 | < 4.6.0-1ubuntu4.2
Xen1 product
- xen≤ 4.7.0
4 vendors · 4 products
References
9 links- support.citrix.com/article/CTX217363X Refsource CONFIRM
