{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c10e753d43ebd1d17e1c62bcee20c6124c2c7cca"
            },
            {
              "fixed": "c7d3712362c8ab8f82f441b649d9e446e7b9aa9d"
            },
            {
              "fixed": "53e6175756b8c474b6247bbcea0aad3d68357475"
            },
            {
              "fixed": "2502684b9e835de9a992ec47c3e6c6faabe3858d"
            },
            {
              "fixed": "37ae8fadc74ed68e5bc364ffd17746d88e449ae3"
            },
            {
              "fixed": "bbbefc48f6617cfb738dcff7f44beb50b5dfeb38"
            },
            {
              "fixed": "243d55bd3f08cb15eee9d63f4716d4d4cdd760f5"
            },
            {
              "fixed": "7b89ce0c98bf3015f493ca4285b2d1056cd8c733"
            },
            {
              "fixed": "39e2a5bf970402a8530a319cf06122e216ba57b8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31770.json"
  },
  "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]",
  "id": "CVE-2026-31770",
  "modified": "2026-07-08T05:38:02.225195279Z",
  "published": "2026-05-01T14:14:59.256Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31770.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31770"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "hwmon: (occ) Fix division by zero in occ_show_power_1()"
}