CVE-2026-63935

Kernel crash via unchecked sampling frequency

Published Jul 19, 2026 · Updated Jul 19, 2026

Denial of service in the Linux Kernel 7.0 NXP SAR ADC driver allows local users to crash the kernel via a crafted sysfs write. The driver's write_raw path divides by an unchecked sampling_frequency value and can also subtract the conversion time from a smaller cycle count, wrapping inpsamp. Reachability requires the driver to be active and its sampling_frequency attribute to be writable; consequences are a kernel crash or an abnormally large input-sampling value.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux Kernel 7.0 NXP SAR ADC driver allows local users to crash the kernel via a crafted sysfs write. The driver's write_raw path divides by an unchecked sampling_frequency value and can also subtract the conversion time from a smaller cycle count, wrapping inpsamp. Reachability requires the driver to be active and its sampling_frequency attribute to be writable; consequences are a kernel crash or an abnormally large input-sampling value.

The record

CVE
CVE-2026-63935
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-369, T1499
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=4434072a893e4864519c167947083ff3e4cc2d95 <a9aba21a539c668a66b58eeb08ad3909e5a54c2a
  2. Affected versionversion=4434072a893e4864519c167947083ff3e4cc2d95 <cb6ea15e7d3c7518f806975a06b7d4c0a26402ea
  3. Affected versionversion=7.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4434072a893e4864519c167947083ff3e4cc2d95 <a9aba21a539c668a66b58eeb08ad3909e5a54c2a; version=4434072a893e4864519c167947083ff3e4cc2d95 <cb6ea15e7d3c7518f806975a06b7d4c0a26402ea; version=7.0

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/C:N/I:N/A:C

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
T1499Endpoint Denial of Service

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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