CVE-2026-90136

kernel: platform/x86/amd/hsmp: Reject negative power cap writes in hwmon

Loading…

Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 17, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's AMD HSMP (Host System Management Port) hardware monitoring (hwmon) driver. A local user can trigger an issue by attempting to set a negative power cap value. Due to an incorrect conversion of this negative input, a nonsensical, extremely high power limit is sent to the System Management Unit (SMU), potentially leading to unexpected system behavior or instability.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-190 · Integer Overflow or Wraparound