RHSA-2026:26709HighCVSS 7.8

Red Hat Security Advisory: xorg-x11-server security, bug fix, and enhancement update

Published
June 17, 2026
Last Modified
June 19, 2026

🔗 CVE IDs covered (9)

CVE-2026-50263 →CVE-2026-50264 →CVE-2026-50258 →CVE-2026-50260 →CVE-2026-50256 →CVE-2026-50257 →CVE-2026-50259 →CVE-2026-50261 →CVE-2026-50262 →

📋 Description

CVE-2026-50256 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch CVE-2026-50257 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() CVE-2026-50258 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels CVE-2026-50259 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing CVE-2026-50260 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() CVE-2026-50261 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() CVE-2026-50262 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes CVE-2026-50263 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() CVE-2026-50264 — xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat

🔗 References (12)