CVE-2026-46220
published 2026-05-28CVE-2026-46220: 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()…
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)
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < ecaa80318e900ca0c3f687742ede33b41cfd2f8e | ecaa80318e900ca0c3f687742ede33b41cfd2f8e |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < 25e7d56a39657d56d1ea6d78992f7ed15dedb412 | 25e7d56a39657d56d1ea6d78992f7ed15dedb412 |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < d4c56932d29773e278be6a65a5384a36c95b89a4 | d4c56932d29773e278be6a65a5384a36c95b89a4 |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < 4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe | 4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < d331fb241a4602253976ddd65144a8ba2b05665d | d331fb241a4602253976ddd65144a8ba2b05665d |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < 0b91ea46bb68abf98a082bf239092253bbd6aaa2 | 0b91ea46bb68abf98a082bf239092253bbd6aaa2 |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < a4fd82fb0757c180bf622907397c528b89a827b2 | a4fd82fb0757c180bf622907397c528b89a827b2 |
| linux | linux | >= 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 < 78d2e624fa073c14970aa097adcf3ea31c157a66 | 78d2e624fa073c14970aa097adcf3ea31c157a66 |
| linux | linux_kernel | — | — |