---
id: CVE-2026-98612
title: 'net: usb: catc: bound the RX packet length in catc_rx_done()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: usb: catc: bound the RX packet length in catc_rx_done()

  catc_rx_done() walks a multi-packet URB, reading a two-byte length from
  each packet header. Its bound, pkt…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3942557938f846e7481f6ccb2b41ccbdee61baa1
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    2f87bbd5a7bf6ee79d598f7e22cf77810d29ae87
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    4cc0a8eb2f9336cfa3e4ac329bc5585ca970ced3
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    21e206dd88b3de6e36bb607dec3797c59bc3007b
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    801e21cf7dd6bcee31db907625d5045f21c9c1d9
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    dd9c6f8f05170223edec2dac476606cd40d9acb7
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    9d4be026bdff2c1da7b6c7e01c0a47f2df409e97
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    9d565b6b72fe3f41fd43636e143072848105189f
  - Linux 2.6.12
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:19:32.790Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98612'
references:
  - url: 'https://git.kernel.org/stable/c/3942557938f846e7481f6ccb2b41ccbdee61baa1'
  - url: 'https://git.kernel.org/stable/c/2f87bbd5a7bf6ee79d598f7e22cf77810d29ae87'
  - url: 'https://git.kernel.org/stable/c/4cc0a8eb2f9336cfa3e4ac329bc5585ca970ced3'
  - url: 'https://git.kernel.org/stable/c/21e206dd88b3de6e36bb607dec3797c59bc3007b'
  - url: 'https://git.kernel.org/stable/c/801e21cf7dd6bcee31db907625d5045f21c9c1d9'
  - url: 'https://git.kernel.org/stable/c/dd9c6f8f05170223edec2dac476606cd40d9acb7'
  - url: 'https://git.kernel.org/stable/c/9d4be026bdff2c1da7b6c7e01c0a47f2df409e97'
  - url: 'https://git.kernel.org/stable/c/9d565b6b72fe3f41fd43636e143072848105189f'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.243Z'
---

## Overview

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

net: usb: catc: bound the RX packet length in catc_rx_done()

catc_rx_done() walks a multi-packet URB, reading a two-byte length from
each packet header. Its bound, pkt_len > urb->actual_length, ignores the
header offset and compares against the whole transfer rather than the
bytes left from pkt_start, so a crafted packet header makes
skb_copy_to_linear_data() read past the buffer.

A length below ETH_HLEN is also accepted, including zero, and
eth_type_trans() then reads a MAC header from the uninitialised tailroom
of a shorter skb. The is_f5u011 branch takes its length straight from
the transfer, so a zero-length URB reaches the same path.

Track the bytes remaining from the current packet, and reject a header
that does not fit, a length past what is left, and a length below an
Ethernet header.

A transfer shorter than an Ethernet header, including a zero-length one,
previously became a runt skb passed to netif_rx() and counted as
received; it is now counted in rx_length_errors and ends the walk.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3942557938f846e7481f6ccb2b41ccbdee61baa1`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2f87bbd5a7bf6ee79d598f7e22cf77810d29ae87`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4cc0a8eb2f9336cfa3e4ac329bc5585ca970ced3`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 21e206dd88b3de6e36bb607dec3797c59bc3007b`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 801e21cf7dd6bcee31db907625d5045f21c9c1d9`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < dd9c6f8f05170223edec2dac476606cd40d9acb7`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9d4be026bdff2c1da7b6c7e01c0a47f2df409e97`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9d565b6b72fe3f41fd43636e143072848105189f`
- `Linux 2.6.12`

## Remediation

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