---
id: CVE-2026-90104
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSv4.1: zero referring call lists before decoding

  decode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so
  each referring_call_list starts uninitialize…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  NFSv4.1: zero referring call lists before decoding

  decode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so
  each referring_call_list starts uninitialize…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 4aece6a19cf7f474f15eb861ba74db4479884ce3 <
    f31f3c042e024aef437cda42f0424ae8d4594b6c
  - >-
    Linux >= 4aece6a19cf7f474f15eb861ba74db4479884ce3 <
    8fa4804fe62ca4155a2d8fc2789d630376cbf2fc
  - Linux 2.6.31
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:42.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90104'
references:
  - url: 'https://git.kernel.org/stable/c/8fa4804fe62ca4155a2d8fc2789d630376cbf2fc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f31f3c042e024aef437cda42f0424ae8d4594b6c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00516
epssPercentile: 0.42779
ingestedAt: '2026-09-17T16:21:47.888Z'
---

## Overview

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

NFSv4.1: zero referring call lists before decoding

decode_cb_sequence_args() allocates csa_rclists with kmalloc_objs(), so
each referring_call_list starts uninitialized. decode_rc_list() assigns
rcl_refcalls only when rcl_nrefcalls is nonzero. A valid list with zero
referring calls therefore leaves the pointer uninitialized, and
nfs4_callback_sequence() later passes stale slab contents to kfree().

Allocate csa_rclists with kzalloc_objs() so every rcl_refcalls member is
NULL from the beginning, including valid empty referring call lists.

## Remediation

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