EUVD-2026-55470
GHSA-6mcx-v8qc-xx8r
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2DescriptionCVE.org
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.
Analysis
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.
Same technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today