---
id: CVE-2025-68308
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  can: kvaser_usb: leaf: Fix potential infinite loop in command parsers

  The `kvaser_usb_leaf_wait_cmd()` and `kvaser_usb_leaf_read_bulk_callback`
  functions contain logic…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  can: kvaser_usb: leaf: Fix potential infinite loop in command parsers

  The `kvaser_usb_leaf_wait_cmd()` and `kvaser_usb_leaf_read_bulk_callback`
  functions contain logic…
severity: none
published: '2025-12-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68308'
references:
  - url: 'https://git.kernel.org/stable/c/028e89c7e8b4346302e88df01cc50e0a1f05791a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0897cea266e39166a36111059ba147192b36592f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0c73772cd2b8cc108d5f5334de89ad648d89b9ec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/58343e0a4d43699f0e2f5b169384bbe4c0217add'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/69c7825df64e24dc15d31631a1fc9145324b1345'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bd8135a560cf6e64f0b98ed4daadf126a38f7f48'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e9dd83a75a7274edef21682c823bf0b66d7b6b7f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00191
epssPercentile: 0.08132
ingestedAt: '2026-10-14T16:40:32.054Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

can: kvaser_usb: leaf: Fix potential infinite loop in command parsers

The `kvaser_usb_leaf_wait_cmd()` and `kvaser_usb_leaf_read_bulk_callback`
functions contain logic to zero-length commands. These commands are used
to align data to the USB endpoint's wMaxPacketSize boundary.

The driver attempts to skip these placeholders by aligning the buffer
position `pos` to the next packet boundary using `round_up()` function.

However, if zero-length command is found exactly on a packet boundary
(i.e., `pos` is a multiple of wMaxPacketSize, including 0), `round_up`
function will return the unchanged value of `pos`. This prevents `pos`
to be increased, causing an infinite loop in the parsing logic.

This patch fixes this in the function by using `pos + 1` instead.
This ensures that even if `pos` is on a boundary, the calculation is
based on `pos + 1`, forcing `round_up()` to always return the next
aligned boundary.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.