CVE-2026-50264

High

Description

An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for privilege escalation if the X server runs as root.

SeverityHigh

CVSS7.8

Exploit probability—

Product

X.org Xwayland

PublishedJun 5, 2026

First seenJun 5, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

x.org xwayland24.1.12 or later
x.org x_server21.1.23 or later

Patches

gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f

Vendor advisories

Affected products

Product	Affected versions	Fixed in
x.org xwayland	v < 24.1.12	24.1.12
x.org x_server	v < 21.1.23	21.1.23
redhat enterprise_linux	7.0, 8.0, 9.0, 10.0	—

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