High severity · published Oct 28, 2026
CVE-2026-93522
X.Org Server Glamor CopyArea Heap Buffer Overflow
New
7.8
CVSS
–
EPSS
No
On KEV
Description
A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO path in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in the X server context.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
XO
xorg-x11-server · x.org
before 21.1.25 · source: vendor
XW
xwayland · x.org
9 before 24.1.14 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93522
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93522
patch
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ad26c26bf795e6464f74c8ef5bb1d41403d877ab
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