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X.Org Server CVE-2026-50262

| EUVDEUVD-2026-34819 MEDIUM
Out-of-bounds Read (CWE-125)
2026-06-05 redhat GHSA-jx39-26rr-cwqp
Buffer Overflow Information Disclosure Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat
5.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Jun 05, 2026 - 12:26 vuln.today
CVE Published
Jun 05, 2026 - 10:36 nvd
MEDIUM 5.5

DescriptionCVE.org

An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.

AnalysisAI

Out-of-bounds read in X.Org X server and Xwayland's GLX extension handler __glXDisp_ChangeDrawableAttributes() allows a local low-privileged user to disclose sensitive memory contents from the X server process. Faulty size validation permits reading a client-controlled number of bytes beyond the request buffer boundary, resulting in high confidentiality impact per CVSS. A secondary write path exists in the same function but is gated behind byte-swapped client support, which is disabled by default, substantially limiting its practical exposure. No public exploit code and no CISA KEV listing have been identified at time of analysis.

Technical ContextAI

The vulnerability resides in the GLX (OpenGL Extension to the X Window System) protocol dispatch layer within the X.Org X server and its Wayland compatibility layer, Xwayland. The function __glXDisp_ChangeDrawableAttributes() processes client-supplied GLX protocol requests but performs an incorrect size validation, failing to bound the read against the actual request buffer length. This is a textbook CWE-125 (Out-of-bounds Read) - client-controlled data determines how many bytes are read, allowing reads past the allocated request buffer into adjacent memory. The secondary write path in the same code block would represent a more severe CWE-787 (Out-of-bounds Write), but it is only reachable when byte-swapped client connections are active, a non-default mode. Affected products per CPE data span the xorg/xserver upstream codebase as packaged in Red Hat Enterprise Linux versions 6 through 10.

RemediationAI

The upstream fix is available via commit 6d459e4daf715bea8abdafa8fb130be2f8a1d145 in the xorg/xserver GitLab repository (https://gitlab.freedesktop.org/xorg/xserver/-/commit/6d459e4daf715bea8abdafa8fb130be2f8a1d145); an exact tagged release version was not independently confirmed from the available data - monitor the xorg-announce list post (https://lists.x.org/archives/xorg-announce/2026-June/003702.html) and the Red Hat advisory (https://access.redhat.com/security/cve/CVE-2026-50262) for distribution-specific update packages. As a compensating control where patching is delayed, administrators can restrict local user access to the X server socket (e.g., via Xwrapper.config or SELinux policy) to reduce the population of users able to submit crafted GLX requests - note this may break legitimate graphical application access. Disabling the GLX extension entirely (-noglx server flag) eliminates the vulnerable code path but will prevent all OpenGL-based applications from functioning. Byte-swapped client support, which gates the write path, is already disabled by default and should not be re-enabled.

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Same weakness CWE-125 – Out-of-bounds Read

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected

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CVE-2026-50262 vulnerability details – vuln.today
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