{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46276",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-46276"
  ],
  "published": "2026-06-08T15:40:52Z",
  "summary": "drm/amdgpu: fix zero-size GDS range init on RDNA4",
  "details": "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)",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46276"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1f5d33e7b0a9a2a140f46e22fb52eede323c5946"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9bc925759c05feae7dfa9570e77131d54729c8ea"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36f9602fb22ede69fcc8b422be0cf8105bf655ad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/be0376affcafa0bbb371bb501579a825eae32281"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e21db1a77967bc15df662efdca8ea8a61d124ea"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/30c000a49094ec568c9b51b7421f7a4a3f0b0298"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3e26c76891ab99fa173e9c501119fbb5c9f4600f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/095a8b0ad3c3b5cdc3850d961adb8a8f735220bb"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-15T02:03:26Z"
  }
}