CVE-2026-68369
Received Received - Intake

USB Gadget Printer Driver Infinite Loop Vulnerability

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: usb: gadget: printer: fix infinite loop in printer_read() printer_read() uses the same variable for the requested copy size and the number of bytes actually copied to user space. copy_to_user() returns the number of bytes not copied, so when it fails to copy anything, the computed copied length becomes zero. In that case len, buf, current_rx_bytes and current_rx_buf are left unchanged. If RX data is available and the user buffer remains unwritable, the read loop can repeat indefinitely. Track the copied length separately and return -EFAULT, or the number of bytes already copied, if an iteration makes no progress.

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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-2026-68369
EUVD
EUVD-2026-55470

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is in the Linux kernel's USB gadget printer driver. The printer_read() function has a flaw where it uses the same variable for both the requested data size and the actual copied data size. When copy_to_user() fails to copy data, it returns the number of bytes not copied, which makes the copied length zero. This causes an infinite loop if RX data is available but the user buffer cannot be written to, as the loop keeps repeating without progress.

Detection Guidance

This vulnerability is specific to the Linux kernel's USB gadget printer driver. Detection requires checking the kernel version and verifying if the vulnerable code path is present. Use uname -a to check the kernel version and grep for the printer driver in the kernel source or running modules.

Impact Analysis

This vulnerability could allow a local attacker to cause a denial of service by triggering an infinite loop in the printer_read() function. This may lead to system hangs or excessive CPU usage, potentially affecting system stability and availability.

Mitigation Strategies

Apply the latest kernel update provided by your Linux distribution to patch the printer_read() vulnerability. If an update is not immediately available, consider disabling the USB gadget printer driver if not needed, or restrict access to the driver via kernel module blacklisting.

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