{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43205",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43205"
  ],
  "published": "2026-05-06T11:29:17Z",
  "summary": "dpaa2-switch: validate num_ifs to prevent out-of-bounds write",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: validate num_ifs to prevent out-of-bounds write\n\nThe driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes()\nbut never validates it against DPSW_MAX_IF (64). This value controls\niteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices\ninto the fixed-size cfg->if_id[DPSW_MAX_IF] array. When firmware reports\nnum_ifs >= 64, the loop can write past the array bounds.\n\nAdd a bound check for num_ifs in dpaa2_switch_init().\n\ndpaa2_switch_fdb_get_flood_cfg() appends the control interface (port\nnum_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all\nports match the flood filter, the loop fills all 64 slots and the control\ninterface write overflows by one entry.\n\nThe check uses >= because num_ifs == DPSW_MAX_IF is also functionally\nbroken.\n\nbuild_if_id_bitmap() silently drops any ID >= 64:\n      if (id[i] < DPSW_MAX_IF)\n          bmap[id[i] / 64] |= ...",
  "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": "6.1.165",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43205"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a26dda3bae469c8e4e1b1993ad33dafa32d0fc28"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3034a8d56174dd6464c46823438f25797910a8d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b690635d4719214892855b79ce018d4b1672ac96"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8b841fd529db9faf8bc678d429d4bf4e98b10900"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/89764cf44544e943230f5e03b8c40a90da26537c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c18493f750208eb4ff1198fc5a02786b8b2d70a6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8a5752c6dcc085a3bfc78589925182e4e98468c5"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}