CVE-2026-46276 (GCVE-0-2026-46276)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:41 – Updated: 2026-06-14 18:05
VLAI
Title
drm/amdgpu: fix zero-size GDS range init on RDNA4
Summary
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c832c346cdf9022872655be621880e0f66f4135d , < 1f5d33e7b0a9a2a140f46e22fb52eede323c5946 (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 9bc925759c05feae7dfa9570e77131d54729c8ea (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 36f9602fb22ede69fcc8b422be0cf8105bf655ad (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < be0376affcafa0bbb371bb501579a825eae32281 (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 0e21db1a77967bc15df662efdca8ea8a61d124ea (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 30c000a49094ec568c9b51b7421f7a4a3f0b0298 (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 3e26c76891ab99fa173e9c501119fbb5c9f4600f (git)
Affected: c832c346cdf9022872655be621880e0f66f4135d , < 095a8b0ad3c3b5cdc3850d961adb8a8f735220bb (git)
Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "dateUpdated": "2026-06-14T18:05:43.582Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46276\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-08T17:16:45.103\",\"lastModified\":\"2026-07-23T07:10:00.113\",\"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-\u003egds.gds_size, adev-\u003egds.gws_size, and adev-\u003egds.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 \u003c= 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 inicializaci\u00f3n de rango GDS de tama\u00f1o cero en RDNA4\\n\\nEl hardware RDNA4 (GFX 12) elimina los recursos de memoria en chip GDS, GWS y OA. El c\u00f3digo de inicializaci\u00f3n gfx_v12_0 deja correctamente adev-\u003egds.gds_size, adev-\u003egds.gws_size y adev-\u003egds.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 tama\u00f1o. Cuando el tama\u00f1o es cero, amdgpu_ttm_init_on_chip() reenv\u00eda 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 \u003c= start) -- trivialmente cierto cuando el tama\u00f1o 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 est\u00e1n ausentes, sin afectar a ning\u00fan otro tipo de GPU.\\n\\nDRM_MM_BUG_ON() solo se activa si CONFIG_DRM_DEBUG_MM est\u00e1 habilitado en la configuraci\u00f3n del kernel. Esto aparentemente rara vez est\u00e1 habilitado, ya que estos chips han estado en el mercado durante m\u00e1s de un a\u00f1o y este problema solo se inform\u00f3 ahora.\\n\\nAn\u00e1lisis de Oops: http://oops.fenrus.org/reports/bugzilla.korg/221376/report.html\\n(seleccionado de la confirmaci\u00f3n 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    "redhat_vex": {
      "current_release_date": "2026-07-31T17:53:13+00:00",
      "cve": "CVE-2026-46276",
      "id": "CVE-2026-46276",
      "initial_release_date": "2026-06-08T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdgpu: fix zero-size GDS range init on RDNA4",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46276.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:53:34Z",
      "cve": "CVE-2026-46276",
      "id": "CVE-2026-46276",
      "initial_release_date": "2026-06-09T02:21:15Z",
      "product_status:known_affected": "118",
      "product_status:known_not_affected": "118",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46276",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46276.json",
      "version": "5"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.