CVE-2026-80745
Received Received - Intake

Incorrect Voltage Mapping in FP9931 Regulator Driver

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: regulator: fp9931: Fix VPOS/VNEG voltage selector table The VPOSNEG_table[] mapping does not match the FP9931 datasheet. The datasheet defines the VPOS/VNEG voltage mapping as: 00h-04h -> 7.04V (-7.04V) 05h -> 7.26V (-7.26V) 06h -> 7.49V (-7.49V) ... 28h-3Fh -> 15.06V (-15.06V) However, VPOSNEG_table[] has two issues: 1. Selector 0x00~0x04 should all map to 7.04V (5 entries), but the table has 6 entries of 7.04V, causing all subsequent entries to be shifted by one position. 2. Selectors 0x29~0x3F should all clamp to 15.06V (23 entries), but the table has only 41 entries. Any selector value above 0x28 would result in an out-of-bounds table access. Fix both issues by removing the duplicate 7.04V entry and appending the missing 23 clamped 15.06V entries, bringing the table to the correct size of 64 entries (0x00~0x3F).

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-80745
EUVD
EUVD-2026-70349

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves incorrect voltage mapping in the FP9931 regulator driver. The VPOSNEG_table[] array does not match the FP9931 datasheet, causing voltage selectors to map to wrong values. Specifically, it has duplicate entries for 7.04V and missing entries for 15.06V, leading to potential out-of-bounds access.

Detection Guidance

This vulnerability is specific to the Linux kernel's regulator subsystem for the FP9931 component. Detection requires checking the kernel version and examining the regulator driver code for the FP9931. No network detection commands are applicable. On the system, inspect the kernel log for regulator-related errors or check the FP9931 driver implementation in the kernel source.

Impact Analysis

This vulnerability could cause incorrect voltage regulation in systems using the FP9931 regulator. This might lead to hardware damage, system instability, or unexpected behavior in power-sensitive applications. Out-of-bounds access could also cause crashes or security issues.

Mitigation Strategies

Apply the latest kernel update that includes the fix for this vulnerability. If updating is not immediately possible, avoid using the FP9931 regulator driver or apply a temporary patch to correct the voltage selector table in the kernel source. Monitor kernel logs for regulator-related errors as a sign of exploitation.

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