---
id: CVE-2026-98031
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nexthop: Initialize extack in remove_nh_grp_entry()

  remove_nh_grp_entry() prints the extack message when a listener fails
  to replace the reduced nexthop group
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nexthop: Initialize extack in remove_nh_grp_entry()

  remove_nh_grp_entry() prints the extack message when a listener fails
  to replace the reduced nexthop group. However…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <
    030c878eaedf0449e2b5401a0a0146d0afcc645e
  - >-
    Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <
    d643cea4248668dc493c513aa7cbc6505eb1a4a9
  - >-
    Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <
    d80677ad7aa5bebfccfd58caa4852b65abe70561
  - >-
    Linux >= 833a1065eeb14437a9a0dfa9dad06ea09894e0b5 <
    5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b
  - Linux 5.11
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:31.787'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98031'
references:
  - url: 'https://git.kernel.org/stable/c/030c878eaedf0449e2b5401a0a0146d0afcc645e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5bd9e4e7cdaa03879e9b73b12ab52cceb1edd55b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d643cea4248668dc493c513aa7cbc6505eb1a4a9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d80677ad7aa5bebfccfd58caa4852b65abe70561'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.852Z'
---

## Overview

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

nexthop: Initialize extack in remove_nh_grp_entry()

remove_nh_grp_entry() prints the extack message when a listener fails
to replace the reduced nexthop group. However, extack is not
initialized and listeners are not required to set a message when
returning an error. Neither netdevsim nor mlxsw do so when an
allocation fails, resulting in the dereference of an uninitialized
stack pointer.

Fix by zero-initializing extack, as was done in commit 6347c5314cee
("nexthop: initialize extack in nh_res_bucket_migrate()").

## Remediation

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