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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)

PUBLISHED Reserved 2026-05-13 | Published 2026-05-28 | Updated 2026-06-01 | Assigner Linux

Product status

Default status
unaffected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before ecaa80318e900ca0c3f687742ede33b41cfd2f8e
affected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before 25e7d56a39657d56d1ea6d78992f7ed15dedb412
affected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before d4c56932d29773e278be6a65a5384a36c95b89a4
affected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before 4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe
affected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before d331fb241a4602253976ddd65144a8ba2b05665d
affected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before 0b91ea46bb68abf98a082bf239092253bbd6aaa2
affected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before a4fd82fb0757c180bf622907397c528b89a827b2
affected

2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 (git) before 78d2e624fa073c14970aa097adcf3ea31c157a66
affected

Default status
affected

4.12
affected

Any version before 4.12
unaffected

5.10.258 (semver)
unaffected

5.15.209 (semver)
unaffected

6.1.175 (semver)
unaffected

6.6.140 (semver)
unaffected

6.12.90 (semver)
unaffected

6.18.32 (semver)
unaffected

7.0.9 (semver)
unaffected

7.1-rc3 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/ecaa80318e900ca0c3f687742ede33b41cfd2f8e

git.kernel.org/...c/25e7d56a39657d56d1ea6d78992f7ed15dedb412

git.kernel.org/...c/d4c56932d29773e278be6a65a5384a36c95b89a4

git.kernel.org/...c/4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe

git.kernel.org/...c/d331fb241a4602253976ddd65144a8ba2b05665d

git.kernel.org/...c/0b91ea46bb68abf98a082bf239092253bbd6aaa2

git.kernel.org/...c/a4fd82fb0757c180bf622907397c528b89a827b2

git.kernel.org/...c/78d2e624fa073c14970aa097adcf3ea31c157a66

cve.org (CVE-2026-46220)

nvd.nist.gov (CVE-2026-46220)

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