Bug 2482165 (CVE-2026-46073)

Summary: CVE-2026-46073 kernel: hwmon: (powerz) Fix missing usb_kill_urb() on signal interrupt
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's hwmon subsystem, specifically within the powerz driver. When a signal interrupt occurs during the wait_for_completion_interruptible_timeout() function, the system fails to properly abort the USB Request Block (URB). This oversight can lead to the kernel attempting to read data from an uninitialized or unfilled transfer buffer, potentially causing system instability or a denial of service.
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Description OSIDB Bzimport 2026-05-27 15:14:23 UTC 
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.
Comment 1 Keith Grant 2026-05-27 17:46:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052758-CVE-2026-46073-37b0@gregkh/T