CVE-2026-23323

HIGHNVD 7.87.8—

7.8

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (macsmc) Fix regressions in Apple Silicon SMC hwmon driver

The recently added macsmc-hwmon driver contained several critical bugs in its sensor population logic and float conversion routines.

Specifically:

The voltage sensor population loop used the wrong prefix ("volt-"

instead of "voltage-") and incorrectly assigned sensors to the temperature sensor array (hwmon->temp.sensors) instead of the voltage sensor array (hwmon->volt.sensors). This would lead to out-of-bounds memory access or data corruption when both temperature and voltage sensors were present.

The float conversion in macsmc_hwmon_write_f32() had flawed exponent

logic for values >= 2^24 and lacked masking for the mantissa, which could lead to incorrect values being written to the SMC.

Fix these issues to ensure correct sensor registration and reliable manual fan control.

Confirm that the reported overflow in FIELD_PREP is fixed by declaring macsmc_hwmon_write_f32() as __always_inline for a compile test.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 4.3%
KEV: Not listed

Published

March 25, 2026

Last Modified

April 23, 2026

References (2)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5dd69b864911ae3847365e8bafe7854e79fbeecb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/625ef35b70d3883fb9a41cd5a988e64dd3e447d6

Data Freshness Timeline

(refreshed 18× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(5)

What is CVE-2026-23323?

CVE-2026-23323 is a high vulnerability published on March 25, 2026. In the Linux kernel, the following vulnerability has been resolved: hwmon: (macsmc) Fix regressions in Apple Silicon SMC hwmon driver The recently added macsmc-hwmon driver contained several critical bugs in its sensor population logic and float conversion routines. Specifically: The voltage sensor…

When was CVE-2026-23323 disclosed?

CVE-2026-23323 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-23323 actively exploited?

CVE-2026-23323 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-23323?

CVE-2026-23323 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2026-23323?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23323, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-23323

📅 Published

🔄 Last Modified

🔗 References (2)