---
id: CVE-2026-74221
title: >-
  U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply()
  function in net/nfs-common.c when processing NFS server responses
summary: >-
  U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply()
  function in net/nfs-common.c when processing NFS server responses. A malicious
  NFS server can send crafted READLINK replies with negative or oversized
  symlink l…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H'
cwe:
  - CWE-195
vendor: u-boot
product: u-boot
affected:
  - u-boot < 2026.10-rc5
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T22:18:33.493'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74221'
references:
  - url: 'https://github.com/u-boot/u-boot'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L643'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-readlink
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T21:49:08.267Z'
---

## Overview

U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.

## Remediation

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