---
id: CVE-2025-71120
title: >-
  SUNRPC: svcauth_gss: avoid NULL deref on zero length gss_token in
  gss_read_proxy_verf
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 <
    a8f1e445ce3545c90d69c9e8ff8f7821825fe810
  - >-
    Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 <
    4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d
  - >-
    Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 <
    f9e53f69ac3bc4ef568b08d3542edac02e83fefd
  - >-
    Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 <
    7452d53f293379e2c38cfa8ad0694aa46fc4788b
  - >-
    Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 <
    a2c6f25ab98b423f99ccd94874d655b8bcb01a19
  - >-
    Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 <
    1c8bb965e9b0559ff0f5690615a527c30f651dd8
  - >-
    Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 <
    d4b69a6186b215d2dc1ebcab965ed88e8d41768d
  - Linux 66ed7b413d31c6ff23901ac4443b1cc1af2f6113
  - Linux 7be8c165dc81564705e8e0b72d398ef708f67eaa
  - Linux >= 4.19.99 < 4.20
  - Linux >= 5.4.15 < 5.5
  - Linux 5.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:42:25.150500Z'
published: '2026-01-14'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:43:58.946Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-71120'
references:
  - url: 'https://git.kernel.org/stable/c/a8f1e445ce3545c90d69c9e8ff8f7821825fe810'
  - url: 'https://git.kernel.org/stable/c/4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d'
  - url: 'https://git.kernel.org/stable/c/f9e53f69ac3bc4ef568b08d3542edac02e83fefd'
  - url: 'https://git.kernel.org/stable/c/7452d53f293379e2c38cfa8ad0694aa46fc4788b'
  - url: 'https://git.kernel.org/stable/c/a2c6f25ab98b423f99ccd94874d655b8bcb01a19'
  - url: 'https://git.kernel.org/stable/c/1c8bb965e9b0559ff0f5690615a527c30f651dd8'
  - url: 'https://git.kernel.org/stable/c/d4b69a6186b215d2dc1ebcab965ed88e8d41768d'
tags:
  - cve.org
epss: 0.00484
epssPercentile: 0.39093
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 >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < a8f1e445ce3545c90d69c9e8ff8f7821825fe810`
- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 4dedb6a11243a5c9eb9dbb97bca3c98bd725e83d`
- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < f9e53f69ac3bc4ef568b08d3542edac02e83fefd`
- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 7452d53f293379e2c38cfa8ad0694aa46fc4788b`
- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < a2c6f25ab98b423f99ccd94874d655b8bcb01a19`
- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < 1c8bb965e9b0559ff0f5690615a527c30f651dd8`
- `Linux >= 5866efa8cbfbadf3905072798e96652faf02dbe8 < d4b69a6186b215d2dc1ebcab965ed88e8d41768d`
- `Linux 66ed7b413d31c6ff23901ac4443b1cc1af2f6113`
- `Linux 7be8c165dc81564705e8e0b72d398ef708f67eaa`
- `Linux >= 4.19.99 < 4.20`
- `Linux >= 5.4.15 < 5.5`
- `Linux 5.5`

## Remediation

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