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Linux Virtual Delivery AgentOperating system · Citrix

CVE-2016-6276

HIGH · 7.8 CVSS v3.0 Published 2016-09-26
Fix available
A fix is available. Upgrade to after 1.3 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Citrix Linux Virtual Delivery Agent (aka VDA, formerly Linux Virtual Desktop) before 1.4.0 allows local users to gain root privileges via unspecified vectors.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Local privilege escalation vulnerability in Citrix Linux Virtual Delivery Agent (VDA) prior to version 1.4.0 allows unprivileged local users to gain root access through unspecified vectors.

MitigationUpgrade Citrix Linux VDA to version 1.4.0 or later to remediate the vulnerability.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux Virtual Delivery AgentOperating system
Affected:<= 1.3

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify Citrix Linux VDA is installed
    Check for the presence of Citrix VDA packages or binaries. Common locations: /opt/Citrix, /usr/lib/x86_64-linuxgnu/ctxvda, or check using command: dpkg -l | grep -i citrix or rpm -qa | grep -i citrix
    Affected if Citrix Linux VDA software is found on the system
  2. Identify installed VDA version
    Run: ctxvda --version or check package version with dpkg -l ctxvda or rpm -q ctxvda. Also check /opt/Citrix/VDA/ctxvda --version if available
    Affected if Command returns a version number of 1.3 or lower, or version cannot be determined (older install)
  3. Compare against affected version range
    Compare the identified version to the affected range: versions 1.3 and earlier. The vulnerable versions are <= 1.3
    Affected if Installed version is 1.3, 1.2, 1.1, 1.0, or any version <=1.3
  4. Confirm VDA service is running
    Check if the VDA service is active: systemctl status ctxvda or service ctxvda status
    Affected if The VDA service is running on an affected version (privilege escalation requires local user access to the system)

System is affected if Citrix Linux VDA is installed with version 1.3 or lower, regardless of whether the service is currently running.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to a release after 1.3
Interim mitigation

Upgrade Citrix Linux VDA to version 1.4.0 or later to remediate the vulnerability.

Fix this in Linux Virtual Delivery Agent Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,080
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2016-6276 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data