CVE-2026-93519 X.Org X server & XWayland - Buffer Overflow

X.Org X server < 21.1.25 and XWayland < 24.1.14 contain a buffer overflow caused by improper handling of pointer barriers in the XFIXES extension, letting authenticated X clients cause crashes or execute code, exploit requires authenticated client.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-122

Vendor fix

Update to X.Org X server 21.1.25 and XWayland 24.1.14 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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