PT-2026-44343 · Linux · Linux

Published 2026-05-28 · Updated 2026-05-28 · CVE-2026-46220

Mitre

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)

Related Identifiers

CVE-2026-46220

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-46220 · Security Note
• https://git.kernel.org/stable/c/78d2e624fa073c14970aa097adcf3ea31c157a66 · Note
• https://git.kernel.org/stable/c/d331fb241a4602253976ddd65144a8ba2b05665d · Note
• https://git.kernel.org/stable/c/4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe · Note
• https://git.kernel.org/stable/c/a4fd82fb0757c180bf622907397c528b89a827b2 · Note
• https://git.kernel.org/stable/c/0b91ea46bb68abf98a082bf239092253bbd6aaa2 · Note