Vulnerability-Lookup

FKIE_CVE-2026-31770

Vulnerability from fkie_nvd - Published: 2026-05-01 15:16 - Updated: 2026-05-11 17:58

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: hwmon: (occ) Fix division by zero in occ_show_power_1() In occ_show_power_1() case 1, the accumulator is divided by update_tag without checking for zero. If no samples have been collected yet (e.g. during early boot when the sensor block is included but hasn't been updated), update_tag is zero, causing a kernel divide-by-zero crash. The 2019 fix in commit 211186cae14d ("hwmon: (occ) Fix division by zero issue") only addressed occ_get_powr_avg() used by occ_show_power_2() and occ_show_power_a0(). This separate code path in occ_show_power_1() was missed. Fix this by reusing the existing occ_get_powr_avg() helper, which already handles the zero-sample case and uses mul_u64_u32_div() to multiply before dividing for better precision. Move the helper above occ_show_power_1() so it is visible at the call site. [groeck: Fix alignment problems reported by checkpatch]

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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      "value": "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\u0027t 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]"
    }
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  "id": "CVE-2026-31770",
  "lastModified": "2026-05-11T17:58:07.823",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
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}

CVE-2026-31770 (GCVE-0-2026-31770)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-11 22:15

Title

hwmon: (occ) Fix division by zero in occ_show_power_1()

Summary

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c7d3712362c8ab8f8…
https://git.kernel.org/stable/c/53e6175756b8c474b…
https://git.kernel.org/stable/c/2502684b9e835de9a…
https://git.kernel.org/stable/c/37ae8fadc74ed68e5…
https://git.kernel.org/stable/c/bbbefc48f6617cfb7…
https://git.kernel.org/stable/c/243d55bd3f08cb15e…
https://git.kernel.org/stable/c/7b89ce0c98bf3015f…
https://git.kernel.org/stable/c/39e2a5bf970402a85…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < c7d3712362c8ab8f82f441b649d9e446e7b9aa9d (git) Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < 53e6175756b8c474b6247bbcea0aad3d68357475 (git) Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < 2502684b9e835de9a992ec47c3e6c6faabe3858d (git) Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < 37ae8fadc74ed68e5bc364ffd17746d88e449ae3 (git) Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < bbbefc48f6617cfb738dcff7f44beb50b5dfeb38 (git) Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5 (git) Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < 7b89ce0c98bf3015f493ca4285b2d1056cd8c733 (git) Affected: c10e753d43ebd1d17e1c62bcee20c6124c2c7cca , < 39e2a5bf970402a8530a319cf06122e216ba57b8 (git)
Linux	Linux	Affected: 5.0 Unaffected: 0 , < 5.0 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.134 , ≤ 6.6.* (semver) Unaffected: 6.12.81 , ≤ 6.12.* (semver) Unaffected: 6.18.22 , ≤ 6.18.* (semver) Unaffected: 6.19.12 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/occ/common.c"
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          "vendor": "Linux",
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          "value": "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\u0027t 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]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:15:28.590Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8"
        }
      ],
      "title": "hwmon: (occ) Fix division by zero in occ_show_power_1()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31770",
    "datePublished": "2026-05-01T14:14:59.256Z",
    "dateReserved": "2026-03-09T15:48:24.140Z",
    "dateUpdated": "2026-05-11T22:15:28.590Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-31770

CVE-2026-31770 (GCVE-0-2026-31770)

Tags

Sightings

Nomenclature