CVE-2026-46073

Analyzed Analyzed - Analysis Complete

USB URB Handling Flaw in Linux Kernel hwmon PowerZ

Publication date: 2026-05-27

Last updated on: 2026-06-24

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (powerz) Fix missing usb_kill_urb() on signal interrupt wait_for_completion_interruptible_timeout() returns -ERESTARTSYS when interrupted. This needs to abort the URB and return an error. No data has been received from the device so any reads from the transfer buffer are invalid. The original code tests !ret, which only catches the timeout case (0). On signal delivery (-ERESTARTSYS), !ret is false so the function skips usb_kill_urb() and falls through to read from the unfilled transfer buffer. Fix by capturing the return value into a long (matching the function return type) and handling signal (negative) and timeout (zero) cases with separate checks that both call usb_kill_urb() before returning.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-05-27

Last Modified

2026-06-24

Generated

2026-07-07

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-05

NVD

CVE-2026-46073

EUVD

EUVD-2026-32455

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.7 (inc) to 6.12.86 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.27 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's hardware monitoring (hwmon) subsystem, specifically in the powerz driver. It involves improper handling of USB request blocks (URBs) when a signal interrupt occurs during a wait operation.

The function wait_for_completion_interruptible_timeout() returns -ERESTARTSYS when interrupted by a signal, but the original code only checked for a timeout (return value 0) and did not properly handle the signal case. As a result, usb_kill_urb() was not called on signal interrupts, causing the system to read from an unfilled transfer buffer where no valid data was received.

The fix involves capturing the return value properly and ensuring usb_kill_urb() is called both on timeout and signal interrupt cases to abort the URB and prevent invalid reads.

Impact Analysis

This vulnerability can lead to the system reading invalid or uninitialized data from the USB transfer buffer when a signal interrupt occurs. This could cause incorrect behavior or data corruption in applications relying on the hardware monitoring data.

While no direct security impact such as privilege escalation or code execution is described, the improper handling of URBs could potentially lead to system instability or unexpected errors in hardware monitoring functions.

Mitigation Strategies

The vulnerability has been resolved in the Linux kernel by fixing the handling of usb_kill_urb() on signal interrupts in the hwmon (powerz) driver.

To mitigate this vulnerability immediately, you should update your Linux kernel to a version that includes this fix.

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