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CVE-2026-46276

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix zero-size GDS range init on RDNA4 RDNA4 (GFX 12) hardware removes the GDS, GWS, and OA on-chip memory resources. The gfx_v12_0 initialisation code correctly leaves adev->gds.gds_size, adev->gds.gws_size, and adev->gds.oa_size at zero to reflect this. amdgpu_ttm_init() unconditionally calls amdgpu_ttm_init_on_chip() for each of these resources regardless of size. When the size is zero, amdgpu_ttm_init_on_chip() forwards the call to ttm_range_man_init(), which calls drm_mm_init(mm, 0, 0). drm_mm_init() immediately fires DRM_MM_BUG_ON(start + size <= start) -- trivially true when size is zero -- crashing the kernel during modprobe of amdgpu on an RX 9070 XT. Guard against this by returning 0 early from amdgpu_ttm_init_on_chip() when size_in_page is zero. This skips TTM resource manager registration for hardware resources that are absent, without affecting any other GPU type. DRM_MM_BUG_ON() only asserts if CONFIG_DRM_DEBUG_MM is enabled in the kernel config. This is apparently rarely enabled as these chips have been in the market for over a year and this issue was only reported now. Oops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html (cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-08 17:16:45.103000
Last modified
2026-11-06 17:17:54.060000
View original CVE JSON 
{
  "id": "CVE-2026-46276",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-06-08T17:16:45.103",
  "lastModified": "2026-11-06T17:17:54.060",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix zero-size GDS range init on RDNA4\n\nRDNA4 (GFX 12) hardware removes the GDS, GWS, and OA on-chip memory\nresources. The gfx_v12_0 initialisation code correctly leaves\nadev->gds.gds_size, adev->gds.gws_size, and adev->gds.oa_size at\nzero to reflect this.\n\namdgpu_ttm_init() unconditionally calls amdgpu_ttm_init_on_chip() for\neach of these resources regardless of size. When the size is zero,\namdgpu_ttm_init_on_chip() forwards the call to ttm_range_man_init(),\nwhich calls drm_mm_init(mm, 0, 0). drm_mm_init() immediately fires\nDRM_MM_BUG_ON(start + size <= start) -- trivially true when size is\nzero -- crashing the kernel during modprobe of amdgpu on an RX 9070 XT.\n\nGuard against this by returning 0 early from\namdgpu_ttm_init_on_chip() when size_in_page is zero. This skips TTM\nresource manager registration for hardware resources that are absent,\nwithout affecting any other GPU type.\n\nDRM_MM_BUG_ON() only asserts if CONFIG_DRM_DEBUG_MM is enabled in\nthe kernel config.  This is apparently rarely enabled as these chips\nhave been in the market for over a year and this issue was only reported\nnow.\n\nOops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html\n(cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amdgpu: corrige la inicialización de rango GDS de tamaño cero en RDNA4\n\nEl hardware RDNA4 (GFX 12) elimina los recursos de memoria en chip GDS, GWS y OA. El código de inicialización gfx_v12_0 deja correctamente adev->gds.gds_size, adev->gds.gws_size y adev->gds.oa_size en cero para reflejar esto.\n\namdgpu_ttm_init() llama incondicionalmente a amdgpu_ttm_init_on_chip() para cada uno de estos recursos, independientemente del tamaño. Cuando el tamaño es cero, amdgpu_ttm_init_on_chip() reenvía la llamada a ttm_range_man_init(), que llama a drm_mm_init(mm, 0, 0). drm_mm_init() dispara inmediatamente DRM_MM_BUG_ON(start + size <= start) -- trivialmente cierto cuando el tamaño es cero -- lo que provoca el fallo del kernel durante el modprobe de amdgpu en una RX 9070 XT.\n\nSe evita esto devolviendo 0 anticipadamente desde amdgpu_ttm_init_on_chip() cuando size_in_page es cero. Esto omite el registro del gestor de recursos TTM para los recursos de hardware que están ausentes, sin afectar a ningún otro tipo de GPU.\n\nDRM_MM_BUG_ON() solo se activa si CONFIG_DRM_DEBUG_MM está habilitado en la configuración del kernel. Esto aparentemente rara vez está habilitado, ya que estos chips han estado en el mercado durante más de un año y este problema solo se informó ahora.\n\nAnálisis de Oops: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html\n(seleccionado de la confirmación 5719ce5865279cad4fd5f01011fe037168503f2d)"
    }
  ],
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        "source": "[email protected]",
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          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
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          "role": "CISA Coordinator",
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  "weaknesses": [
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      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
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          "value": "NVD-CWE-noinfo"
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