CVE-2026-68182
Received Received - Intake

General Protection Fault in Linux Kernel comedi_parport Driver

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: comedi: comedi_parport: deal with premature interrupt Syzbot reported a general protection fault in `comedi_get_is_subdevice_running()`, which was called from the interrupt handler `parport_interrupt()` in the "comedi_parport" driver, but it does not currently have a C reproducer for the problem. It's probably due to a premature interrupt for one of two reasons: 1. The driver sets up the interrupt handler before the comedi subdevices used by the interrupt handler have been allocated, but does not disable the interrupt in the parallel port's CTRL register first. 2. The driver uses a user-supplied I/O port base address which Syzbot would have supplied, but it might not be backed by real parallel port hardware. Change the initialization order in the driver's comedi "attach" handler (`parport_attach()`) so that the hardware registers are initialized before the interrupt handler is requested. This should prevent premature interrupts occurring for real hardware. Also add a test to the interrupt handler to ensure the comedi device is fully attached and return early if it isn't.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68182
EUVD
EUVD-2026-55283

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
comedi comedi_parport *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a general protection fault in the Linux kernel's comedi_parport driver. It occurs due to a premature interrupt in the parallel port's interrupt handler, which can happen if the driver sets up the interrupt handler before comedi subdevices are allocated or if a user-supplied I/O port base address is not backed by real hardware. The fix involves changing the initialization order to initialize hardware registers before requesting the interrupt handler.

Detection Guidance

This vulnerability is specific to the Linux kernel's comedi_parport driver and may cause a general protection fault. Detection requires checking kernel logs for general protection faults related to comedi or parport, particularly during driver initialization or interrupt handling. Commands like dmesg | grep -i comedi or dmesg | grep -i parport may help identify issues.

Impact Analysis

This vulnerability could cause system crashes or instability due to general protection faults triggered by premature interrupts. If exploited, it might lead to denial-of-service conditions or unexpected behavior in systems using the comedi_parport driver for parallel port operations.

Mitigation Strategies

Update the Linux kernel to a version that includes the fix for this vulnerability. The issue is resolved by changing the initialization order in the comedi_parport driver to ensure hardware registers are set up before the interrupt handler is requested. Check your distribution's security updates or kernel patches.

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