{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31770",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31770"
  ],
  "published": "2026-05-01T14:17:31Z",
  "summary": "hwmon: (occ) Fix division by zero in occ_show_power_1()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (occ) Fix division by zero in occ_show_power_1()\n\nIn occ_show_power_1() case 1, the accumulator is divided by\nupdate_tag without checking for zero. If no samples have been\ncollected yet (e.g. during early boot when the sensor block is\nincluded but hasn't been updated), update_tag is zero, causing\na kernel divide-by-zero crash.\n\nThe 2019 fix in commit 211186cae14d (\"hwmon: (occ) Fix division by\nzero issue\") only addressed occ_get_powr_avg() used by\nocc_show_power_2() and occ_show_power_a0(). This separate code\npath in occ_show_power_1() was missed.\n\nFix this by reusing the existing occ_get_powr_avg() helper, which\nalready handles the zero-sample case and uses mul_u64_u32_div()\nto multiply before dividing for better precision. Move the helper\nabove occ_show_power_1() so it is visible at the call site.\n\n[groeck: Fix alignment problems reported by checkpatch]",
  "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": "6.1.168",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31770"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}