A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.
Fix
Vendor advisories in the News 1
- ZDI-26-764: X.Org Server XFixes Pointer Barrier Heap-based Buffer Overflow Privilege Escalation Vulnerability Zero Day Initiative: published advisories · 2026-10-15
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 3
- StatusAwaiting Analysis → PublishedNVD modified 2026-10-28 14:41
- StatusPublished → Awaiting AnalysisNVD modified 2026-10-28 15:21
- First seenCVSS 7.8 · x.org, x.orggNVD modified 2026-10-28 14:41
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.