CVE-2026-50263Hinoki check available

Local information disclosure via stale screen-private pointer

Published Jun 5, 2026 · Updated Jun 5, 2026

Use-after-free in X.Org X server and Xwayland before 21.1.23 and 24.1.12 allows local users to disclose process memory. CreateSaverWindow clears hasWindow and calls CheckScreenPrivate, which can free the screen-private structure before the stale pPriv pointer is reused. Any X client able to connect to the server can trigger the path by changing saver-window attributes and forcing the screen saver, exposing memory without altering data or interrupting service.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in X.Org X server and Xwayland before 21.1.23 and 24.1.12 allows local users to disclose process memory. CreateSaverWindow clears hasWindow and calls CheckScreenPrivate, which can free the screen-private structure before the stale pPriv pointer is reused. Any X client able to connect to the server can trigger the path by changing saver-window attributes and forcing the screen saver, exposing memory without altering data or interrupting service.

The record

CVE
CVE-2026-50263
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-416, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

5.5Red Hat, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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