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CVE-2026-50259

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Redhat X.org Xorg
Products
Enterprise Linux Enterprise Linux Eus Rhel Aus and 9 more
CVE-2024-21886

Xorg-x11-server: heap buffer overflow in disabledevice

A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding environments.

CVSS 3.1 · 7.8 High EPSS 1.4% KEV · Not listed
Vendors
Redhat Xorg
Products
Enterprise Linux Rhel Aus Rhel E4s and 5 more
CVE-2008-2361

X.org Render extension ProcRenderCreateCursor() crash

Integer overflow in the ProcRenderCreateCursor function in the Render extension in the X server 1.4 in X.Org X11R7.3 allows context-dependent attackers to cause a denial of service (daemon crash) via unspecified request fields that are used to calculate a glyph buffer size, which triggers a dereference of unmapped memory.

CVSS 2.0 · 6.8 Medium EPSS 1.6% KEV · Not listed
Vendors
Redhat Xorg
Products
Enterprise Linux X11