---
id: CVE-2026-45897
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nft_counter: serialize reset with spinlock

  Add a global static spinlock to serialize counter fetch+reset
  operations, preventing concurrent dump-and-reset fr…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nft_counter: serialize reset with spinlock

  Add a global static spinlock to serialize counter fetch+reset
  operations, preventing concurrent dump-and-reset fr…
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'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.1.107, < 6.2'
  - 'linux_kernel >= 6.6.48, < 6.19.4'
patched:
  - linux_kernel 6.19.4
published: '2026-05-27'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T12:17:41.570'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45897'
references:
  - url: 'https://git.kernel.org/stable/c/0cdc6d5a26f2d1f7f15a43526841b679445c32e2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/48cf7918d10c66cb6b05226fa3fa5daf0c891089'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/779c60a5190c42689534172f4b49e927c9959e4e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cd968dcdec6aee79a2d399e4f6e0eca63c3b45e1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/de6601f1374fab124cd9276df6671f64d940ceb4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e13194e60217db02c2e7202375d9e5951267d87b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00156
epssPercentile: 0.05202
ingestedAt: '2026-08-03T10:24:19.905Z'
---

## Overview

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

netfilter: nft_counter: serialize reset with spinlock

Add a global static spinlock to serialize counter fetch+reset
operations, preventing concurrent dump-and-reset from underrunning
values.

The lock is taken before fetching the total so that two parallel
resets cannot both read the same counter values and then both
subtract them.

A global lock is used for simplicity since resets are infrequent.
If this becomes a bottleneck, it can be replaced with a per-net
lock later.

## Affected

- `linux_kernel >= 6.1.107, < 6.2`
- `linux_kernel >= 6.6.48, < 6.19.4`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.4`