CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99151?
CVE-2026-99151 is a vulnerability in Linux, published on 28 Oct 2026.
Official description
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)
Which versions are affected by CVE-2026-99151?
How do I fix CVE-2026-99151?
Upgrade to a fixed version.
Is CVE-2026-99151 being exploited?
There is no known exploitation of CVE-2026-99151 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-99151, GHSA-ff22-8xjr-7629, UBUNTU-CVE-2026-99151.