Medium 5.5Published May 28, 2026

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

Updated under an hour ago (Oct 27, 2026, 1:30 AM ET)

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Exploited in the last 30 days

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)

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 before ecaa80318e900ca0c3f687742ede33b41cfd2f8e; 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 builds before 25e7d56a39657d56d1ea6d78992f7ed15dedb412; from 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 before d4c56932d29773e278be6a65a5384a36c95b89a4; 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 builds before 4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe; from 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 before d331fb241a4602253976ddd65144a8ba2b05665d; 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 builds before 0b91ea46bb68abf98a082bf239092253bbd6aaa2; from 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 before a4fd82fb0757c180bf622907397c528b89a827b2; 2130f89ced2cc0f5113bb427c1cbc7a4ca7729c7 builds before 78d2e624fa073c14970aa097adcf3ea31c157a66	CNA record
linux linux_kernel linux:linux_kernel	from 4.12 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.9; 7.1; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/ecaa80318e900ca0c3f687742ede33b41cfd2f8e	patch
https://git.kernel.org/stable/c/25e7d56a39657d56d1ea6d78992f7ed15dedb412	patch
https://git.kernel.org/stable/c/d4c56932d29773e278be6a65a5384a36c95b89a4	patch
https://git.kernel.org/stable/c/4f7ca00fa91daf0795ec6b3b130c5ebba1f155fe	patch
https://git.kernel.org/stable/c/d331fb241a4602253976ddd65144a8ba2b05665d	patch
https://git.kernel.org/stable/c/0b91ea46bb68abf98a082bf239092253bbd6aaa2	patch
https://git.kernel.org/stable/c/a4fd82fb0757c180bf622907397c528b89a827b2	patch
https://git.kernel.org/stable/c/78d2e624fa073c14970aa097adcf3ea31c157a66	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.