A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server context.
Fix
Vendor advisories in the News 1
- ZDI-26-762: X.Org Server GLX RenderLarge 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 6
- StatusAwaiting Analysis → PublishedNVD modified 2026-10-28 13:16
- StatusPublished → Awaiting AnalysisNVD modified 2026-10-28 15:21
- StatusReceived → PublishedNVD modified 2026-10-28 13:16
- StatusPublished → ReceivedNVD modified 2026-10-28 14:17
- CVSS8.5 (v4.0, CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) → 8.5 (v4.0, CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)NVD modified 2026-10-28 14:17
- First seenCVSS 8.5 · x.orgg, x.orgNVD modified 2026-10-28 13:16
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.