---
id: CVE-2026-53011
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/sched: taprio: fix use-after-free in advance_sched() on schedule switch

  In advance_sched(), when should_change_schedules() returns true,
  switch_schedules() is call…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/sched: taprio: fix use-after-free in advance_sched() on schedule switch

  In advance_sched(), when should_change_schedules() returns true,
  switch_schedules() is call…
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'
published: '2026-06-24'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53011'
references:
  - url: 'https://git.kernel.org/stable/c/0e62171df8ed4804d00db088f17eed06468233fa'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/105425b1969c5affe532713cfac1c0b320d7ac2b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1bd286fa3e21200133478ed523cc6a2788baf38a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3471874578160a28c171a607fa069f24062634b8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7256996e1ef553716817f3bfd077c2f3b48b582f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a8fc396519ef4f081bc545e88f61241728bb78d7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b73235da5dde77ed1264f9767b62c28c9d71fd78'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/eee072fe16c646190d33ae69c9983d8de1562bf8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00171
epssPercentile: 0.05733
ingestedAt: '2026-07-11T17:13:40.373Z'
---

## Overview

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

net/sched: taprio: fix use-after-free in advance_sched() on schedule switch

In advance_sched(), when should_change_schedules() returns true,
switch_schedules() is called to promote the admin schedule to oper.
switch_schedules() queues the old oper schedule for RCU freeing via
call_rcu(), but 'next' still points into an entry of the old oper
schedule. The subsequent 'next->end_time = end_time' and
rcu_assign_pointer(q->current_entry, next) are use-after-free.

Fix this by selecting 'next' from the new oper schedule immediately
after switch_schedules(), and using its pre-calculated end_time.
setup_first_end_time() sets the first entry's end_time to
base_time + interval when the schedule is installed, so the value
is already correct.

The deleted 'end_time = sched_base_time(admin)' assignment was also
harmful independently: it would overwrite the new first entry's
pre-calculated end_time with just base_time.

## Remediation

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