CVE-2026-46220

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amdgpu/sdma4: replace BUG_ON with WARN_ON in fence emission<br /> <br /> sdma_v4_0_ring_emit_fence() contains two BUG_ON(addr &amp; 0x3) assertions<br /> that verify fence writeback addresses are dword-aligned. These<br /> assertions can be reached from unprivileged userspace via crafted<br /> DRM_IOCTL_AMDGPU_CS submissions, causing a fatal kernel panic in a<br /> scheduler worker thread.<br /> <br /> Replace both BUG_ON() calls with WARN_ON() to log the condition without<br /> crashing the kernel. A misaligned fence address at this point indicates<br /> a driver bug, but crashing the kernel is never the correct response when<br /> the assertion is reachable from userspace.<br /> <br /> The CS IOCTL path is the correct place to filter invalid submissions;<br /> the ring emission callback is too late to do anything about it.<br /> <br /> (cherry picked from commit b90250bd933afd1ba94d86d6b13821997b22b18e)