---
id: CVE-2026-89701
title: 'nfsd: validate nseconds in TIME_DELEG decode paths'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfsd: validate nseconds in TIME_DELEG decode paths

  The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms
  store a raw uint32_t nseconds directly into tv_…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-1284
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 <
    7e7b93da7fa2e77f977096251899d1410986adf6
  - >-
    Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 <
    5eb489831a9fd4754f4baf26e6989efb66ce104c
  - >-
    Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 <
    0f4a767340fad392bd656115b8752005518c9065
  - Linux 6.14
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:51:14.339Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89701'
references:
  - url: 'https://git.kernel.org/stable/c/7e7b93da7fa2e77f977096251899d1410986adf6'
  - url: 'https://git.kernel.org/stable/c/5eb489831a9fd4754f4baf26e6989efb66ce104c'
  - url: 'https://git.kernel.org/stable/c/0f4a767340fad392bd656115b8752005518c9065'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89701.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89701'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532154'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89701'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89701'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89701.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00206
epssPercentile: 0.10637
ingestedAt: '2026-09-14T11:11:19.885Z'
---

## Overview

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

nfsd: validate nseconds in TIME_DELEG decode paths

The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms
store a raw uint32_t nseconds directly into tv_nsec without enforcing
nseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this
check but the TIME_DELEG paths do not. A malformed timespec can
propagate through notify_change() to disk.

Add range checks in both nfs4xdr.c (SETATTR path) and
nfs4callback.c (CB_GETATTR path).

## Affected

- `Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 7e7b93da7fa2e77f977096251899d1410986adf6`
- `Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 5eb489831a9fd4754f4baf26e6989efb66ce104c`
- `Linux >= 6ae30d6eb26bce02c48c60074b4306270e2434c1 < 0f4a767340fad392bd656115b8752005518c9065`
- `Linux 6.14`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89701.json)