CVE-2026-46220 - drm/amdgpu/sdma4: replace BUG_ON with WARN_ON in fence emission

CVE-2026-46220 - drm/amdgpu/sdma4: replace BUG_ON with WARN_ON in fence emission

https://cvefeed.io/rssfeed/latest.atom / Thu, 05/28/2026 - 14:25
CVE ID :CVE-2026-46220
Published : May 28, 2026, 10:16 a.m. | 44 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/sdma4: replace BUG_ON with WARN_ON in fence emission sdma_v4_0_ring_emit_fence() contains two BUG_ON(addr & 0x3) assertions that verify fence writeback addresses are dword-aligned. These assertions can be reached from unprivileged userspace via crafted DRM_IOCTL_AMDGPU_CS submissions, causing a fatal kernel panic in a scheduler worker thread. Replace both BUG_ON() calls with WARN_ON() to log the condition without crashing the kernel. A misaligned fence address at this point indicates a driver bug, but crashing the kernel is never the correct response when the assertion is reachable from userspace. The CS IOCTL path is the correct place to filter invalid submissions; the ring emission callback is too late to do anything about it. (cherry picked from commit b90250bd933afd1ba94d86d6b13821997b22b18e)
Severity: 0.0 | NA
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