CVE-2006-4243
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 · uneditedlinux vserver 2.6 before 2.6.17 suffers from privilege escalation in remount code.
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 confidenceLinux VServer 2.6 versions before 2.6.17 contain a privilege escalation vulnerability in the remount code that allows local users to gain elevated privileges through improper permission checking during filesystem remount operations.
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>= 1.9.0, < 2.6.17CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 checksWork through these to decide whether this CVE applies to you.
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Confirm Linux VServer is installedRun 'which vserver' or check for VServer processes with 'ps aux | grep vserver'Affected if The vserver command exists or VServer-related processes are running
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Identify VServer versionRun 'vserver --version' to get the VServer utility version, or 'uname -r' to check if the kernel is VServer-enabled (often contains 'vserver' in the version string)Affected if The version returned is >= 1.9.0 and < 2.6.17
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Verify remount capability is accessibleCheck if non-privileged users can invoke mount operations within a VServer context. This typically involves examining /proc/mounts or using 'vserver <name> exec mount -o remount ...'Affected if Remount operations can be executed by local users without proper privilege escalation controls
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Compare against affected version rangeDocument the exact VServer version identified and compare it to the vulnerable range: 1.9.0 through versions before 2.6.17Affected if The installed version falls within >= 1.9.0 and < 2.6.17
A system is affected if Linux VServer version 1.9.0 or higher but lower than 2.6.17 is installed and local users can perform filesystem remount operations within the VServer environment.
Generated from the published advisory. Verify against your own configuration.
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.
dbcve · scoped2.6.17
Upgrade Linux VServer to version 2.6.17 or later to address the remount code privilege escalation, or apply the specific security patch if upgrading is not feasible.
Linux Vserver 2.6.17 or later
- 1. Identify the currently installed Linux Vserver version using 'vserver --version' or checking package management
- 2. Ensure all running vserver instances are properly shut down before upgrading
- 3. Update the package repository and upgrade to Linux Vserver 2.6.17 or later using the system's package manager (e.g., apt-get update && apt-get install linux-vserver or equivalent)
- 4. After upgrading, reboot the host system to load the new kernel/vserver components
- 5. Verify the new version is installed and the remount functionality is properly secured
- 6. Test that vserver instances can be started and function correctly with the updated version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2006-4243 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2006-4243 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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