CVE-2026-31770

Kernel crash via zero OCC sample counter

Published May 1, 2026 · Updated May 1, 2026

Divide-by-zero in the OCC hwmon driver for Linux Kernel allows local users to crash the kernel by reading an empty power sample set. The occ_show_power_1() case 1 path divides the power accumulator by update_tag without checking whether the sample counter is zero. Exploitation requires an included but not yet updated OCC sensor block, such as during early boot, and causes an availability-only kernel crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in the OCC hwmon driver for Linux Kernel allows local users to crash the kernel by reading an empty power sample set. The occ_show_power_1() case 1 path divides the power accumulator by update_tag without checking whether the sample counter is zero. Exploitation requires an included but not yet updated OCC sensor block, such as during early boot, and causes an availability-only kernel crash.

The record

CVE
CVE-2026-31770
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0
  2. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <243d55bd3f08cb15eee9d63f4716d4d4cdd760f5
  3. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <2502684b9e835de9a992ec47c3e6c6faabe3858d
  4. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <37ae8fadc74ed68e5bc364ffd17746d88e449ae3
  5. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <39e2a5bf970402a8530a319cf06122e216ba57b8
  6. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <53e6175756b8c474b6247bbcea0aad3d68357475
  7. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <7b89ce0c98bf3015f493ca4285b2d1056cd8c733
  8. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <bbbefc48f6617cfb738dcff7f44beb50b5dfeb38
  9. Affected versionversion=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <c7d3712362c8ab8f82f441b649d9e446e7b9aa9d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.0; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <243d55bd3f08cb15eee9d63f4716d4d4cdd760f5; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <2502684b9e835de9a992ec47c3e6c6faabe3858d; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <37ae8fadc74ed68e5bc364ffd17746d88e449ae3; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <39e2a5bf970402a8530a319cf06122e216ba57b8; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <53e6175756b8c474b6247bbcea0aad3d68357475; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <7b89ce0c98bf3015f493ca4285b2d1056cd8c733; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <bbbefc48f6617cfb738dcff7f44beb50b5dfeb38; version=c10e753d43ebd1d17e1c62bcee20c6124c2c7cca <c7d3712362c8ab8f82f441b649d9e446e7b9aa9d

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-369Divide By Zero
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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