CVE-2026-46276

Estado: AnalizadaMedia (5.5)—

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.

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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.

Detalles técnicos trazas, registros y código del informe original

Oops-Analysis: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html
(cherry picked from commit 5719ce5865279cad4fd5f01011fe037168503f2d)

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 5
Fecha de la puntuación: 6/10/2026

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

NVD-CWE-noinfo

Referencias

JSON original (NVD)

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      "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)"
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      "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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  "lastModified": "2026-07-23T07:10:00.113",
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