CVE-2026-64236

Kernel panic via zeroed fallback bus frequency

Published Jul 24, 2026 · Updated Jul 24, 2026

Divide-by-zero in the Linux Kernel DaVinci I2C driver allows local users to panic the kernel when a node lacks clock-frequency. The i2c-davinci probe divides the 100 kHz fallback constant by 1,000 as if it were hertz, truncating dev->bus_freq to zero before divider calculation. The driver must probe a device-tree node without clock-frequency; the deterministic panic interrupts the entire system.

CVSS severity5.5
Medium
EPSS probability0.11%
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 Linux Kernel DaVinci I2C driver allows local users to panic the kernel when a node lacks clock-frequency. The i2c-davinci probe divides the 100 kHz fallback constant by 1,000 as if it were hertz, truncating dev->bus_freq to zero before divider calculation. The driver must probe a device-tree node without clock-frequency; the deterministic panic interrupts the entire system.

The record

CVE
CVE-2026-64236
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=6.14
  2. Affected versionversion=b04ce63859793e3439b394976b8d29e785d4d69a <030675aa54cf757769b3db65642433d626b3ed7c
  3. Affected versionversion=b04ce63859793e3439b394976b8d29e785d4d69a <3f43865cb64dd7cb50efae1281a95585617b12a1
  4. Affected versionversion=b04ce63859793e3439b394976b8d29e785d4d69a <9b694bc0e1831cbc5c3bbfd1b156ec719128f7d9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.14; version=b04ce63859793e3439b394976b8d29e785d4d69a <030675aa54cf757769b3db65642433d626b3ed7c; version=b04ce63859793e3439b394976b8d29e785d4d69a <3f43865cb64dd7cb50efae1281a95585617b12a1; version=b04ce63859793e3439b394976b8d29e785d4d69a <9b694bc0e1831cbc5c3bbfd1b156ec719128f7d9

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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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