CVE-2026-23323

Kernel memory corruption via misassigned voltage sensors

Published Mar 25, 2026 · Updated Mar 25, 2026

Memory corruption in the Linux kernel 6.19 macsmc-hwmon driver allows local users to corrupt kernel memory during sensor registration. The voltage loop searches for the wrong key prefix and stores discovered voltage sensors in the temperature array; its float writer also mishandles large exponents and leaves mantissa bits unmasked. Reachability requires Linux on an Apple Silicon Mac; the array error needs both temperature and voltage sensors, while unsafe manual fan control is disabled by default.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel 6.19 macsmc-hwmon driver allows local users to corrupt kernel memory during sensor registration. The voltage loop searches for the wrong key prefix and stores discovered voltage sensors in the temperature array; its float writer also mishandles large exponents and leaves mantissa bits unmasked. Reachability requires Linux on an Apple Silicon Mac; the array error needs both temperature and voltage sensors, while unsafe manual fan control is disabled by default.

The record

CVE
CVE-2026-23323
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.19
  2. Affected versionversion=785205fd81399bd8e49065aee3362a99d5702321 <5dd69b864911ae3847365e8bafe7854e79fbeecb
  3. Affected versionversion=785205fd81399bd8e49065aee3362a99d5702321 <625ef35b70d3883fb9a41cd5a988e64dd3e447d6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=785205fd81399bd8e49065aee3362a99d5702321 <5dd69b864911ae3847365e8bafe7854e79fbeecb; version=785205fd81399bd8e49065aee3362a99d5702321 <625ef35b70d3883fb9a41cd5a988e64dd3e447d6

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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