---
id: CVE-2025-71120
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in
  gss_read_proxy_verf


  A zero length gss_token results in pages == 0 and in_token->pages[0]

  is NULL
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in
  gss_read_proxy_verf


  A zero length gss_token results in pages == 0 and in_token->pages[0]

  is NULL. The…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.19.99, < 4.20'
  - 'linux_kernel >= 5.4.15, < 5.5'
  - 'linux_kernel >= 5.5.1, < 5.10.248'
  - 'linux_kernel >= 5.11, < 5.15.198'
  - 'linux_kernel >= 5.16, < 6.1.160'
  - 'linux_kernel >= 6.2, < 6.6.120'
  - 'linux_kernel >= 6.7, < 6.12.64'
  - 'linux_kernel >= 6.13, < 6.18.3'
  - linux_kernel = 5.5
  - linux_kernel = 6.19
patched:
  - linux_kernel 6.18.3
published: '2026-01-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:18:22.753'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-71120'
references:
  - url: 'https://git.kernel.org/stable/c/1c8bb965e9b0559ff0f5690615a527c30f651dd8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7452d53f293379e2c38cfa8ad0694aa46fc4788b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a2c6f25ab98b423f99ccd94874d655b8bcb01a19'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a8f1e445ce3545c90d69c9e8ff8f7821825fe810'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d4b69a6186b215d2dc1ebcab965ed88e8d41768d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f9e53f69ac3bc4ef568b08d3542edac02e83fefd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-457936.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00529
epssPercentile: 0.44534
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:42:25.150500Z'
ingestedAt: '2026-09-08T15:33:26.995Z'
---

## Overview

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

SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in gss_read_proxy_verf

A zero length gss_token results in pages == 0 and in_token->pages[0]
is NULL. The code unconditionally evaluates
page_address(in_token->pages[0]) for the initial memcpy, which can
dereference NULL even when the copy length is 0. Guard the first
memcpy so it only runs when length > 0.

## Affected

- `linux_kernel >= 4.19.99, < 4.20`
- `linux_kernel >= 5.4.15, < 5.5`
- `linux_kernel >= 5.5.1, < 5.10.248`
- `linux_kernel >= 5.11, < 5.15.198`
- `linux_kernel >= 5.16, < 6.1.160`
- `linux_kernel >= 6.2, < 6.6.120`
- `linux_kernel >= 6.7, < 6.12.64`
- `linux_kernel >= 6.13, < 6.18.3`
- `linux_kernel = 5.5`
- `linux_kernel = 6.19`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.18.3`