---
id: CVE-2026-23245
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/sched: act_gate: snapshot parameters with RCU on replace

  The gate action can be replaced while the hrtimer callback or dump path is
  walking the schedule list.

  Con…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/sched: act_gate: snapshot parameters with RCU on replace

  The gate action can be replaced while the hrtimer callback or dump path is
  walking the schedule list.

  Con…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.8.1, < 5.10.253'
  - 'linux_kernel >= 5.11, < 6.1.167'
  - 'linux_kernel >= 6.2, < 6.6.130'
  - 'linux_kernel >= 6.7, < 6.12.78'
  - 'linux_kernel >= 6.13, < 6.18.18'
  - 'linux_kernel >= 6.19, < 6.19.8'
  - linux_kernel = 5.8
  - linux_kernel = 7.0
patched:
  - linux_kernel 6.19.8
published: '2026-03-18'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:18:44.580'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-23245'
references:
  - url: 'https://git.kernel.org/stable/c/035d0d09d5ab3ed3e93d18cde2b562a6719eea23'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/04d75529dc0f9be78786162ebab7424af4644df2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/58b162e318d0243ad2d7d92456c0873f2494c351'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/62413a9c3cb183afb9bb6e94dd68caf4e4145f4c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8b1251bbf0f10ac745ed74bad4d3b433caa1eeae'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dfc314d7c767e350f78a46a8f8b134f80e8ad432'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fc98fd8d214693be91253d9a88cdf8e5e143d124'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-457936.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00136
epssPercentile: 0.0298
ingestedAt: '2026-09-08T15:33:26.993Z'
---

## Overview

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

net/sched: act_gate: snapshot parameters with RCU on replace

The gate action can be replaced while the hrtimer callback or dump path is
walking the schedule list.

Convert the parameters to an RCU-protected snapshot and swap updates under
tcf_lock, freeing the previous snapshot via call_rcu(). When REPLACE omits
the entry list, preserve the existing schedule so the effective state is
unchanged.

## Affected

- `linux_kernel >= 5.8.1, < 5.10.253`
- `linux_kernel >= 5.11, < 6.1.167`
- `linux_kernel >= 6.2, < 6.6.130`
- `linux_kernel >= 6.7, < 6.12.78`
- `linux_kernel >= 6.13, < 6.18.18`
- `linux_kernel >= 6.19, < 6.19.8`
- `linux_kernel = 5.8`
- `linux_kernel = 7.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.19.8`