CVE-2016-9381: citrix xenserver
Vulnerability summary
CVE-2016-9381 is a high (CVSS 7.5) vulnerability in citrix xenserver. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.8% of scored vulnerabilities.
Not severe (CVSS 7.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 11 · Related 9Timeline
- 23-01-2017PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka a "double fetch" vulnerability.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.29%
Chance of exploitation in the next 30 days
Percentile
22%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.29% 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, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu2 products
- qemu< 2.0.0+dfsg-2ubuntu1.33 | < 1:2.5+dfsg-5ubuntu10.11
- xen< 4.4.2-0ubuntu0.14.04.9
Alpine1 product
- xen< 4.7.1-r1
Citrix1 product
- xenserver6.0.2 | 6.2.0 | 6.5 | 7.0
Debian1 product
- xen< 4.4.0-1
Qemu1 product
- qemu≤ 2.7.1 | 2.8.0:rc0
5 vendors · 6 products
