---
id: CVE-2026-53270
title: 'ipvs: clear the svc scheduler ptr early on edit'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipvs: clear the svc scheduler ptr early on edit

  ip_vs_edit_service() while unbinding the old scheduler clears
  the svc->scheduler ptr after the scheduler module initiat…
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 >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    d10730a1f2caf08088e0db1b19b242f3e6fa5f06
  - >-
    Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    e4feec3174036ba772006be74beee0efa09a9eb8
  - >-
    Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    7d4f5004511757e3984901ffb412fcf858d80ed5
  - >-
    Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    c6376b9b1b4d2bad638256b1b3588e073344ae69
  - >-
    Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    14e4689c113b4c06af1069364ade24fdd7055f33
  - >-
    Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    25918720ba97f974a4f8d433b5a0132c5b43f6f3
  - >-
    Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03
  - >-
    Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 <
    193989cc6d80dd8e0460fb3992e69fa03bf0ff9b
  - Linux c803fddd2a95a70873c68dbff42d4c59fd2e674e
  - Linux 4ec8fb23158797affae7993c15beba080488482f
  - Linux >= 3.18.23 < 3.19
  - Linux >= 4.1.11 < 4.2
  - Linux 4.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:28:13.169684Z'
published: '2026-06-25'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:31:44.852Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53270'
references:
  - url: 'https://git.kernel.org/stable/c/d10730a1f2caf08088e0db1b19b242f3e6fa5f06'
  - url: 'https://git.kernel.org/stable/c/e4feec3174036ba772006be74beee0efa09a9eb8'
  - url: 'https://git.kernel.org/stable/c/7d4f5004511757e3984901ffb412fcf858d80ed5'
  - url: 'https://git.kernel.org/stable/c/c6376b9b1b4d2bad638256b1b3588e073344ae69'
  - url: 'https://git.kernel.org/stable/c/14e4689c113b4c06af1069364ade24fdd7055f33'
  - url: 'https://git.kernel.org/stable/c/25918720ba97f974a4f8d433b5a0132c5b43f6f3'
  - url: 'https://git.kernel.org/stable/c/19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03'
  - url: 'https://git.kernel.org/stable/c/193989cc6d80dd8e0460fb3992e69fa03bf0ff9b'
tags:
  - cve.org
epss: 0.00121
epssPercentile: 0.01749
ingestedAt: '2026-10-16T17:24:46.740Z'
---

## Overview

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

ipvs: clear the svc scheduler ptr early on edit

ip_vs_edit_service() while unbinding the old scheduler clears
the svc->scheduler ptr after the scheduler module initiates
RCU callbacks. This can cause packets to use the old
scheduler at the time when svc->sched_data is already freed
after RCU grace period.

Fix it by clearing the ptr early in ip_vs_unbind_scheduler(),
before the done_service method schedules any RCU callbacks.

Also, if the new scheduler fails to initialize when replacing
the old scheduler, try to restore the old scheduler while still
returning the error code.

## Affected

- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < d10730a1f2caf08088e0db1b19b242f3e6fa5f06`
- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < e4feec3174036ba772006be74beee0efa09a9eb8`
- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < 7d4f5004511757e3984901ffb412fcf858d80ed5`
- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < c6376b9b1b4d2bad638256b1b3588e073344ae69`
- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < 14e4689c113b4c06af1069364ade24fdd7055f33`
- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < 25918720ba97f974a4f8d433b5a0132c5b43f6f3`
- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < 19a9493faa4bf3c7bd0a386f30b60b1bb4a3da03`
- `Linux >= 05f00505a89acd21f5d0d20f5797dfbc4cf85243 < 193989cc6d80dd8e0460fb3992e69fa03bf0ff9b`
- `Linux c803fddd2a95a70873c68dbff42d4c59fd2e674e`
- `Linux 4ec8fb23158797affae7993c15beba080488482f`
- `Linux >= 3.18.23 < 3.19`
- `Linux >= 4.1.11 < 4.2`
- `Linux 4.2`

## Remediation

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