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CVE-2026-46220

Estado: AnalizadaMedia (5.5)—

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.

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(cherry picked from commit b90250bd933afd1ba94d86d6b13821997b22b18e)

Detalles técnicos trazas, registros y código del informe original
The CS IOCTL path is the correct place to filter invalid submissions;
the ring emission callback is too late to do anything about it.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
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      "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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