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X.Org Foundation xorg-serverA client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigg…

Risk 33
Severity
7

A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write in DRIGetBuffers/DRIGetBuffersWithFormat.

Any local X client that can connect to the server can trigger this issue. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Components affected: xorg-x11-server, xorg-x11-server-Xwayland Versions affected: xorg-x11-server <= 21.1.22, xorg-x11-server-Xwayland <= 24.1.9

Fixed upstream in xorg-server-21.1.23 and xwayland-24.1.12. Fix: https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f

Identified by Peter Hutterer, Red Hat. Tracking: PSIRTSUPT-16950.

First published (updated )
REDHAT-BUG-2485389

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