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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
VLAI
Title
hwmon: (occ) Fix division by zero in occ_show_power_1()
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]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
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Move the helper\\nabove occ_show_power_1() so it is visible at the call site.\\n\\n[groeck: Fix alignment problems reported by 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:31:56+00:00",
      "cve": "CVE-2026-31770",
      "id": "CVE-2026-31770",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (occ) Fix division by zero in occ_show_power_1()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31770.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T01:27:01Z",
      "cve": "CVE-2026-31770",
      "id": "CVE-2026-31770",
      "initial_release_date": "2026-05-06T01:42:50Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "406",
      "product_status:known_not_affected": "220",
      "product_status:recommended": "265",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31770",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31770.json",
      "version": "7"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.