CVE-2026-93521:

Check your X.Org server version because a dozen vulnerabilities have been patched

X.Org patched 12 X server and Xwayland flaws, including nine that can allow arbitrary code execution.

X.Org fixed 12 security flaws in the X server and Xwayland, released in xorg-server 21.1.25 and xwayland 24.1.14. Nine can lead to arbitrary code execution, while the other three can crash the server or disclose information. The bugs include seven buffer overflows or out-of-bounds writes, three use-after-free issues, one double free, and one out-of-bounds read; ten say an authenticated X client can trigger the flaw. CVE-2026-93522, a heap overflow in Glamor CopyArea, affects only Xwayland, and CVE-2026-93520 and CVE-2026-93521 finish incomplete earlier fixes.

Help Net SecurityOct 7, 03:58 UTC · 9d agoVulnerability CVE-2026-93515 CVE-2026-93519 CVE-2026-93520+4 CVEs2

ZDI-26-766: X.Org Server RandR Heap-based Buffer Overflow Privilege Escalation Vulnerability

ZDI disclosed a local RandR heap overflow in X.Org Server that allows privilege escalation.

The Zero Day Initiative published ZDI-26-766, a heap-based buffer overflow in the X.Org Server RandR component. A local attacker who already has low-privileged code execution can use it to escalate privileges. ZDI assigned a CVSS score of 7.8 and CVE-2026-93521. The write-up does not state that exploitation has been observed.

ZDI Published AdvisoriesOct 15, 05:00 UTC · 1d agoVulnerability CVE-2026-935211

CVE-2026-93521

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Check your X.Org server version because a dozen vulnerabilities have been patched

ZDI-26-766: X.Org Server RandR Heap-based Buffer Overflow Privilege Escalation Vulnerability