dbcve.org
Enterprise LinuxOperating system · Redhat

CVE-2025-26600

HIGH · 7.8 CVSS v3.1 Published 2025-02-25
Fix available
A fix is available. Upgrade to 21.1.16 / 24.1.6 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
A use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the events queued for that device remain while the device is freed. Replaying the events will cause a use-after-free.

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 · high confidence

A use-after-free vulnerability in X.Org and Xwayland occurs when a device is removed while frozen—events queued for that device remain after the device memory is freed, and replaying those events triggers use-after-free.

MitigationApply vendor patches for X.Org/Xwayland; as a workaround, avoid removing devices while they are in a frozen state.

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
Enterprise LinuxOperating system
Affected:= 7.0= 8.0= 9.0
TigervncApplication
Affected:all versions
X ServerApplication
Affected:< 21.1.16
XwaylandApplication
Affected:< 24.1.6

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:3.1/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. Check X.org X Server version
    Run 'Xorg -version' or check the installed package version via your package manager (e.g., 'rpm -q xorg-x11-server' on RHEL, 'dpkg -l xserver-xorg-core' on Debian)
    Affected if Version is below 21.1.16
  2. Check Xwayland version
    Run 'Xwayland --version' or check the installed package version via your package manager (e.g., 'rpm -q xwayland' on RHEL)
    Affected if Version is below 24.1.6
  3. Check Red Hat Enterprise Linux version
    Run 'cat /etc/redhat-release' or 'rpm -q redhat-release'
    Affected if Version is 7.0, 8.0, or 9.0 and running vulnerable X components
  4. Check for device removal crashes in logs
    Review system logs (journalctl, /var/log/messages, Xorg log files) for use-after-free errors, segmentation faults, or input device removal failures occurring around the time of device disconnection
    Affected if Logs contain use-after-free errors or crashes related to input device event replay after device removal

A user is affected if their X.org X Server is below 21.1.16, Xwayland is below 24.1.6, or they are on RHEL 7.0/8.0/9.0 with the vulnerable X components, and they experience crashes during input device removal while the device is frozen.

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.

dbcve · scoped
Upgrade available Upgrade to 21.1.16 / 24.1.6 or later
Fixed in 21.1.1624.1.6
Interim mitigation

Apply vendor patches for X.Org/Xwayland; as a workaround, avoid removing devices while they are in a frozen state.

Recommended fix Moderate confidence

X Server 21.1.16 or later; Xwayland 24.1.6 or later; consult vendor for Tigervnc fixed release

  1. Update X Server to version 21.1.16 or later
  2. Update Xwayland to version 24.1.6 or later
  3. Update Tigervnc to the latest available version (check vendor for fixed release)
  4. Reboot the system or restart the X server to apply changes
  5. Verify the installed versions match the fixed releases: xorg-x11-server --version and xwayland --version

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Enterprise Linux Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing4.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,900
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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-2025-26600 in production — separate from our analysis above.

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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