---
id: CVE-2026-63959
title: 'usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT

  A broken/malicious port can transmit a CRC-valid frame whose header
  advertises up to seven data o…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 6f413b559f86a2894188e082e389ff95ee428345 <
    8a8cd4790b08c9f79ea2250b3bd933fd79f67e56
  - >-
    Linux >= 6f413b559f86a2894188e082e389ff95ee428345 <
    0af00f1459f5dd757f0d392f8caa38039561ac62
  - >-
    Linux >= 6f413b559f86a2894188e082e389ff95ee428345 <
    dc17721d42e6d89f63572e63add8306a0e15eb3c
  - >-
    Linux >= 6f413b559f86a2894188e082e389ff95ee428345 <
    9b496e3371c04f0a03b7faa5d2442536d00e3998
  - >-
    Linux >= 6f413b559f86a2894188e082e389ff95ee428345 <
    c4ab8e2d4432abb646c5c0687f8dab173da901f9
  - >-
    Linux >= 6f413b559f86a2894188e082e389ff95ee428345 <
    aa2f716327be1818e1cb156da8a2844804aaec2f
  - Linux 5.10
published: '2026-07-19'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T12:27:22.431Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63959'
references:
  - url: 'https://git.kernel.org/stable/c/8a8cd4790b08c9f79ea2250b3bd933fd79f67e56'
  - url: 'https://git.kernel.org/stable/c/0af00f1459f5dd757f0d392f8caa38039561ac62'
  - url: 'https://git.kernel.org/stable/c/dc17721d42e6d89f63572e63add8306a0e15eb3c'
  - url: 'https://git.kernel.org/stable/c/9b496e3371c04f0a03b7faa5d2442536d00e3998'
  - url: 'https://git.kernel.org/stable/c/c4ab8e2d4432abb646c5c0687f8dab173da901f9'
  - url: 'https://git.kernel.org/stable/c/aa2f716327be1818e1cb156da8a2844804aaec2f'
tags:
  - cve.org
epss: 0.0016
epssPercentile: 0.05256
ingestedAt: '2026-11-05T15:02:32.398Z'
---

## Overview

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

usb: typec: tcpm/tcpci_maxim: validate header NDO against RX_BYTE_CNT

A broken/malicious port can transmit a CRC-valid frame whose header
advertises up to seven data objects but whose body carries fewer than
that.  Check for this, and rightfully reject the message, instead of
reading from uninitialized stack memory.

## Affected

- `Linux >= 6f413b559f86a2894188e082e389ff95ee428345 < 8a8cd4790b08c9f79ea2250b3bd933fd79f67e56`
- `Linux >= 6f413b559f86a2894188e082e389ff95ee428345 < 0af00f1459f5dd757f0d392f8caa38039561ac62`
- `Linux >= 6f413b559f86a2894188e082e389ff95ee428345 < dc17721d42e6d89f63572e63add8306a0e15eb3c`
- `Linux >= 6f413b559f86a2894188e082e389ff95ee428345 < 9b496e3371c04f0a03b7faa5d2442536d00e3998`
- `Linux >= 6f413b559f86a2894188e082e389ff95ee428345 < c4ab8e2d4432abb646c5c0687f8dab173da901f9`
- `Linux >= 6f413b559f86a2894188e082e389ff95ee428345 < aa2f716327be1818e1cb156da8a2844804aaec2f`
- `Linux 5.10`

## Remediation

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