CVE-2026-63931

Kernel exception via unchecked zero divisor

Published Jul 19, 2026 · Updated Jul 19, 2026

Division by zero in the Linux Kernel SCD30 sensor driver allows local users to trigger a kernel exception through a sysfs write. The scd30_write_raw function divides 1,000,000,000 by the unvalidated fractional value val2 while processing IIO_CHAN_INFO_SAMP_FREQ. Reachability requires local write access to sampling_frequency with the SCD30 driver bound to sensor hardware; a zero fractional value triggers the exception.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Division by zero in the Linux Kernel SCD30 sensor driver allows local users to trigger a kernel exception through a sysfs write. The scd30_write_raw function divides 1,000,000,000 by the unvalidated fractional value val2 while processing IIO_CHAN_INFO_SAMP_FREQ. Reachability requires local write access to sampling_frequency with the SCD30 driver bound to sensor hardware; a zero fractional value triggers the exception.

The record

CVE
CVE-2026-63931
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=5.9
  2. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <2c50c017df97bfb425038efdfb8514c7bcd08564
  3. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <4748bce423a363bb8a85a624faeb8f54fe331611
  4. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <5aba4f94b225617a55fed442a70329b2ee19c0a5
  5. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <5e4d34092a5ebfbc3a45a180c76ecb1cdbbedd53
  6. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <6308b812acdcac38cbfe1af0b1524c3375f408a5
  7. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <c7a740bf75554b051fabb17596ca6e483d6e6d90
  8. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <d98c2e69aab905d1b19a69ffe584efa46a9efd42
  9. Affected versionversion=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <e85bc501947f5ae16dd9adc01162b76d55ab7962

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.9; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <2c50c017df97bfb425038efdfb8514c7bcd08564; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <4748bce423a363bb8a85a624faeb8f54fe331611; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <5aba4f94b225617a55fed442a70329b2ee19c0a5; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <5e4d34092a5ebfbc3a45a180c76ecb1cdbbedd53; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <6308b812acdcac38cbfe1af0b1524c3375f408a5; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <c7a740bf75554b051fabb17596ca6e483d6e6d90; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <d98c2e69aab905d1b19a69ffe584efa46a9efd42; version=64b3d8b1b0f5c16c19045785e4da8391ae35ec99 <e85bc501947f5ae16dd9adc01162b76d55ab7962

Published CVSS scores

No CVSS assessment is available in this record.

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application 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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