In the Linux kernel, the following vulnerability has been resolved: hwmon: (ltc4282) Clamp negative current limits When a negative value is passed… (CVE-2026-74685)
A vulnerability in the Linux kernel's hwmon driver for ltc4282 was resolved. The issue involved improper handling of negative current limit values passed to the ltc4282_write_curr() function, where a signed long negative value was cast directly to an unsigned 64-bit integer, causing incorrect large positive values. This led to an overflow and truncation in a 32-bit variable, resulting in the current limit being clamped incorrectly to the maximum limit instead of zero. The fix clamps the value to zero and the maximum supported limit before casting and division to prevent underflow and overflow.
AI Analysis
Technical Summary
The Linux kernel hwmon driver for ltc4282 contained a vulnerability where negative current limit values passed to ltc4282_write_curr() were cast directly from a signed long to an unsigned 64-bit integer. This caused negative inputs to convert into large positive values, leading to overflow and truncation in a 32-bit variable. Consequently, the current limit was clamped to the maximum limit rather than zero, potentially causing incorrect hardware behavior. The patch clamps the input value between zero and the maximum supported limit before casting and division, preventing underflow and overflow conditions.
Potential Impact
The vulnerability could cause the system to interpret negative current limits as large positive values, resulting in the current limit being set incorrectly to the maximum limit. This may lead to hardware misbehavior or incorrect power management. No known exploits in the wild have been reported. The impact is limited to the affected hwmon driver functionality within the Linux kernel.
Mitigation Recommendations
A fix has been implemented that clamps the input value to zero and the maximum supported limit before casting and division, preventing underflow and overflow. Users should apply the official Linux kernel patch that addresses this issue. Patch status is not explicitly confirmed in the provided data; check the vendor advisory or Linux kernel mailing lists for the current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: hwmon: (ltc4282) Clamp negative current limits When a negative value is passed… (CVE-2026-74685)
Description
A vulnerability in the Linux kernel's hwmon driver for ltc4282 was resolved. The issue involved improper handling of negative current limit values passed to the ltc4282_write_curr() function, where a signed long negative value was cast directly to an unsigned 64-bit integer, causing incorrect large positive values. This led to an overflow and truncation in a 32-bit variable, resulting in the current limit being clamped incorrectly to the maximum limit instead of zero. The fix clamps the value to zero and the maximum supported limit before casting and division to prevent underflow and overflow.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel hwmon driver for ltc4282 contained a vulnerability where negative current limit values passed to ltc4282_write_curr() were cast directly from a signed long to an unsigned 64-bit integer. This caused negative inputs to convert into large positive values, leading to overflow and truncation in a 32-bit variable. Consequently, the current limit was clamped to the maximum limit rather than zero, potentially causing incorrect hardware behavior. The patch clamps the input value between zero and the maximum supported limit before casting and division, preventing underflow and overflow conditions.
Potential Impact
The vulnerability could cause the system to interpret negative current limits as large positive values, resulting in the current limit being set incorrectly to the maximum limit. This may lead to hardware misbehavior or incorrect power management. No known exploits in the wild have been reported. The impact is limited to the affected hwmon driver functionality within the Linux kernel.
Mitigation Recommendations
A fix has been implemented that clamps the input value to zero and the maximum supported limit before casting and division, preventing underflow and overflow. Users should apply the official Linux kernel patch that addresses this issue. Patch status is not explicitly confirmed in the provided data; check the vendor advisory or Linux kernel mailing lists for the current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-pg82-jq9q-m7pf
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-74685"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a8a27f0acd9273b499bc74a
Added to database: 08/22/2026, 22:51:28 UTC
Last enriched: 08/23/2026, 00:25:19 UTC
Last updated: 08/23/2026, 01:52:14 UTC
Views: 3
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