CVE-2026-46220
Full vulnerability record from the local CVENow database.
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)
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-28 10:16:37.640000
Last modified
2026-11-06 17:17:44.920000
View original CVE JSON
{
"id": "CVE-2026-46220",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-05-28T10:16:37.640",
"lastModified": "2026-11-06T17:17:44.920",
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/sdma4: replace BUG_ON with WARN_ON in fence emission\n\nsdma_v4_0_ring_emit_fence() contains two BUG_ON(addr & 0x3) assertions\nthat verify fence writeback addresses are dword-aligned. These\nassertions can be reached from unprivileged userspace via crafted\nDRM_IOCTL_AMDGPU_CS submissions, causing a fatal kernel panic in a\nscheduler worker thread.\n\nReplace both BUG_ON() calls with WARN_ON() to log the condition without\ncrashing the kernel. A misaligned fence address at this point indicates\na driver bug, but crashing the kernel is never the correct response when\nthe assertion is reachable from userspace.\n\nThe CS IOCTL path is the correct place to filter invalid submissions;\nthe ring emission callback is too late to do anything about it.\n\n(cherry picked from commit b90250bd933afd1ba94d86d6b13821997b22b18e)"
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