CVE-2026-88812 X.Org X Server - Use After Free

X.Org X Server < 21.1.25 and X Wayland < 24.1.14 contain a double free vulnerability in XKB SetGeometry, letting attached clients cause a crash or potentially execute code in the server context, exploit requires client attachment.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.19% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
27 October 2026
Updated
29 October 2026
Weakness
CWE-415

Vendor fix

Update to X.Org X Server 21.1.25 or later and X Wayland 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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