drm/amdgpu/sdma4: replace BUG_ON with WARN_ON in fence emission

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Summary

CVECVE-2026-46220
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:37 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn 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)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe git Not specified
CNA Linux Linux affected 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 d331fb241a4602253976ddd65144a8ba2b05665d git Not specified
CNA Linux Linux affected 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 0b91ea46bb68abf98a082bf239092253bbd6aaa2 git Not specified
CNA Linux Linux affected 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 a4fd82fb0757c180bf622907397c528b89a827b2 git Not specified
CNA Linux Linux affected 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 78d2e624fa073c14970aa097adcf3ea31c157a66 git Not specified
CNA Linux Linux affected 4.12 Not specified
CNA Linux Linux unaffected 4.12 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.90 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.32 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.9 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d331fb241a4602253976ddd65144a8ba2b05665d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0b91ea46bb68abf98a082bf239092253bbd6aaa2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/78d2e624fa073c14970aa097adcf3ea31c157a66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a4fd82fb0757c180bf622907397c528b89a827b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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