---
id: CVE-2026-23245
title: 'net/sched: act_gate: snapshot parameters with RCU on replace'
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a51c328df3106663879645680609eb49b3ff6444 <
    fc98fd8d214693be91253d9a88cdf8e5e143d124
  - >-
    Linux >= a51c328df3106663879645680609eb49b3ff6444 <
    8b1251bbf0f10ac745ed74bad4d3b433caa1eeae
  - >-
    Linux >= a51c328df3106663879645680609eb49b3ff6444 <
    dfc314d7c767e350f78a46a8f8b134f80e8ad432
  - >-
    Linux >= a51c328df3106663879645680609eb49b3ff6444 <
    035d0d09d5ab3ed3e93d18cde2b562a6719eea23
  - >-
    Linux >= a51c328df3106663879645680609eb49b3ff6444 <
    04d75529dc0f9be78786162ebab7424af4644df2
  - >-
    Linux >= a51c328df3106663879645680609eb49b3ff6444 <
    58b162e318d0243ad2d7d92456c0873f2494c351
  - >-
    Linux >= a51c328df3106663879645680609eb49b3ff6444 <
    62413a9c3cb183afb9bb6e94dd68caf4e4145f4c
  - Linux 5.8
published: '2026-03-18'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:45:10.126Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23245'
references:
  - url: 'https://git.kernel.org/stable/c/fc98fd8d214693be91253d9a88cdf8e5e143d124'
  - url: 'https://git.kernel.org/stable/c/8b1251bbf0f10ac745ed74bad4d3b433caa1eeae'
  - url: 'https://git.kernel.org/stable/c/dfc314d7c767e350f78a46a8f8b134f80e8ad432'
  - url: 'https://git.kernel.org/stable/c/035d0d09d5ab3ed3e93d18cde2b562a6719eea23'
  - url: 'https://git.kernel.org/stable/c/04d75529dc0f9be78786162ebab7424af4644df2'
  - url: 'https://git.kernel.org/stable/c/58b162e318d0243ad2d7d92456c0873f2494c351'
  - url: 'https://git.kernel.org/stable/c/62413a9c3cb183afb9bb6e94dd68caf4e4145f4c'
tags:
  - cve.org
epss: 0.00127
epssPercentile: 0.01984
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 >= a51c328df3106663879645680609eb49b3ff6444 < fc98fd8d214693be91253d9a88cdf8e5e143d124`
- `Linux >= a51c328df3106663879645680609eb49b3ff6444 < 8b1251bbf0f10ac745ed74bad4d3b433caa1eeae`
- `Linux >= a51c328df3106663879645680609eb49b3ff6444 < dfc314d7c767e350f78a46a8f8b134f80e8ad432`
- `Linux >= a51c328df3106663879645680609eb49b3ff6444 < 035d0d09d5ab3ed3e93d18cde2b562a6719eea23`
- `Linux >= a51c328df3106663879645680609eb49b3ff6444 < 04d75529dc0f9be78786162ebab7424af4644df2`
- `Linux >= a51c328df3106663879645680609eb49b3ff6444 < 58b162e318d0243ad2d7d92456c0873f2494c351`
- `Linux >= a51c328df3106663879645680609eb49b3ff6444 < 62413a9c3cb183afb9bb6e94dd68caf4e4145f4c`
- `Linux 5.8`

## Remediation

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