{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46006",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46006"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "drm/nouveau: fix u32 overflow in pushbuf reloc bounds check",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau: fix u32 overflow in pushbuf reloc bounds check\n\nnouveau_gem_pushbuf_reloc_apply() validates each relocation with\n\n    if (r->reloc_bo_offset + 4 > nvbo->bo.base.size)\n\nbut reloc_bo_offset is __u32 (uapi/drm/nouveau_drm.h) and the integer\nliteral 4 promotes to unsigned int, so the addition is performed in 32\nbits and wraps before the comparison against the size_t bo size.\n\nCast to u64 so the addition happens in 64-bit arithmetic.\n\n[ Add Fixes: tag. - Danilo ]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "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-2026-46006"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3429275684f4bad42876955301f3c5c814aae909"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/573a1104bd36e49c067a9dc62e7c476d5ee7e92a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/45a45184b9c0b0b26ead06e370cda2073616a7cc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fa297e919d1680c38ab268ff952b1698dac987f6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d749a9a0ee4014681487e7ae549901aa8c176637"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/332884f5eb79dd60a7162b079d09d39208567a31"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e441d5c23ec644c8d27593db3b8928e8933512a9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2fc87d37be1b730a149b035f9375fdb8cc5333a5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached through the DRM_IOCTL_NOUVEAU_GEM_PUSHBUF ioctl on the local GPU device/render node; it requires local system access, not network or adjacent reachability.\nAC:L - The attacker fully controls the relocation array (reloc_bo_offset, data, presumed fields) and can deterministically set reloc_bo_offset to 0xFFFFFFFC to wrap the check and force the write; there is no race or uncontrolled condition.\nPR:L - NOUVEAU_GEM_PUSHBUF is marked DRM_RENDER_ALLOW, so it is accessible to any unprivileged local user holding the render node (no root or DRM master required).\nUI:N - The attacking process issues the ioctl itself; no action by another user or victim is needed.\nS:U - The out-of-bounds write corrupts kernel memory within the kernel's own security authority and does not cross a VM/IOMMU/sandbox boundary.\nC:H - A controlled out-of-bounds kernel write of this kind is a memory-corruption primitive that can be leveraged to corrupt adjacent structures and ultimately disclose kernel memory.\nI:H - The flaw yields an out-of-bounds write of a largely attacker-controlled 32-bit value into kernel address space, an arbitrary-write-class primitive enabling control-flow/data corruption.\nA:H - The wild write at a fixed ~4 GB offset beyond the buffer mapping almost always hits unmapped/foreign memory, causing a kernel oops or panic."
    }
  }
}