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NVD / CVE Program· CNA Linux

CVE-2026-31770: hwmon: (occ) Fix division by zero in occ_show_power_1()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5, 2502684b9e835de9a992ec47c3e6c6faabe3858d, 37ae8fadc74ed68e5bc364ffd17746d88e449ae3.

Low priority for now. Upgrade to Linux Linux 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5, 2502684b9e835de9a992ec47c3e6c6faabe3858d, 37ae8fadc74ed68e5bc364ffd17746d88e449ae3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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]

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.0 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.0affected
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before c7d3712362c8ab8f82f441b649d9e446e7b9aa9daffected · git
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before 53e6175756b8c474b6247bbcea0aad3d68357475affected · git
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before 2502684b9e835de9a992ec47c3e6c6faabe3858daffected · git
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before 37ae8fadc74ed68e5bc364ffd17746d88e449ae3affected · git
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before bbbefc48f6617cfb738dcff7f44beb50b5dfeb38affected · git
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5affected · git
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before 7b89ce0c98bf3015f493ca4285b2d1056cd8c733affected · git
    • c10e753d43ebd1d17e1c62bcee20c6124c2c7cca and later · before 39e2a5bf970402a8530a319cf06122e216ba57b8affected · git
    • before 5.0not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-31766May 1, 2026 · drm/amdgpu: validate doorbell_offset in user queue creation
    28Monitor
  • ← EarlierCVE-2026-31769May 1, 2026 · gpib: fix use-after-free in IO ioctl handlers
    31Monitor
  • Later →CVE-2026-31780May 1, 2026 · wifi: wilc1000: fix u8 overflow in SSID scan buffer size calculation
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux243d55bd3f08cb15eee9d63f4716d4d4cdd760f5Vendor (CNA)
Linux Linux2502684b9e835de9a992ec47c3e6c6faabe3858dVendor (CNA)
Linux Linux37ae8fadc74ed68e5bc364ffd17746d88e449ae3Vendor (CNA)
Linux Linux39e2a5bf970402a8530a319cf06122e216ba57b8Vendor (CNA)
Linux Linux53e6175756b8c474b6247bbcea0aad3d68357475Vendor (CNA)
Linux Linux7b89ce0c98bf3015f493ca4285b2d1056cd8c733Vendor (CNA)
Linux Linuxbbbefc48f6617cfb738dcff7f44beb50b5dfeb38Vendor (CNA)
Linux Linuxc7d3712362c8ab8f82f441b649d9e446e7b9aa9dVendor (CNA)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-317670 days apartdrm/i915/dsi: Don't do DSC horizontal timing adjustments in command mode
    22Monitor
  • CVE-2026-431825 days apartmedia: ccs: Avoid possible division by zero
    22Monitor
  • CVE-2026-432385 days apartnet/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()
    22Monitor
  • CVE-2026-432675 days apartwifi: rtw89: fix potential zero beacon interval in beacon tracking
    22Monitor
  • CVE-2026-433547 days apartiio: proximity: hx9023s: Protect against division by zero in set_samp_freq
    22Monitor
  • CVE-2026-434117 days aparttipc: fix divide-by-zero in tipc_sk_filter_connect()
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-369 · Divide By Zero

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records