Live › vulnerability › CVE-2026-99151
Go to dashboardIn the AMD display driver's USB4 bandwidth functions, a missing NULL check on stream->sink can cause a NULL pointer dereference because the guarding ASSERT is compiled out of production builds. The sources describe this as a kernel crash condition and do not state that an attacker can run code through it.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-28 11:32 UTC. All times on this page are UTC.
Systems running a Linux kernel with the amdgpu display driver (drm/amd/display) and USB4 or Thunderbolt display paths. Systems without AMD graphics hardware or without this driver loaded are not affected. The sources do not give the exact affected version ranges.
No product ranges from the sources yet.
Unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
allocate_usb4_bandwidth_for_stream() and allocate_usb4_bandwidth() both use ASSERT(stream->sink) before dereferencing stream->sink->link. ASSERT is compiled out in production builds, so a NULL stream->sink causes a NULL pointer dereference.
link_set_dpms_off() already guards two earlier accesses to stream->sink with explicit NULL checks, confirming that stream->sink can legitimately be NULL. The subsequent call to deallocate_usb4_bandwidth() had no equivalent guard.
Replace the ASSERT() calls with proper NULL checks that return false early, and add a matching stream->sink guard at the call site in link_set_dpms_off() consistent with the surrounding pattern.
v2: Keep the existing ASSERT() calls for diagnostics (to report unexpected NULL sink), and add explicit NULL checks that return false before dereferencing stream->sink. Also add a matching stream->sink guard at the deallocation call site in link_set_dpms_off(). (Alex)
(cherry picked from commit 98029a0ce61feb52c563f65349dd9b25f672e355)
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