---
id: CVE-2021-46911
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ch_ktls: Fix kernel panic

  Taking page refcount is not ideal and causes kernel panic
  sometimes
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ch_ktls: Fix kernel panic

  Taking page refcount is not ideal and causes kernel panic
  sometimes. It's better to take tx_ctx lock for the complete
  skb transmit, to avoid …
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.7.0, < 5.10.32'
  - 'linux_kernel >= 5.11.0, < 5.11.16'
patched:
  - linux_kernel 5.11.16
published: '2024-02-27'
updated: '2026-08-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-46911'
references:
  - url: 'https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00594
epssPercentile: 0.46114
ingestedAt: '2026-08-04T10:39:38.193Z'
---

## Overview

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

ch_ktls: Fix kernel panic

Taking page refcount is not ideal and causes kernel panic
sometimes. It's better to take tx_ctx lock for the complete
skb transmit, to avoid page cleanup if ACK received in middle.

## Affected

- `linux_kernel >= 5.7.0, < 5.10.32`
- `linux_kernel >= 5.11.0, < 5.11.16`

## Remediation

Upgrade past the affected range:

- `linux_kernel 5.11.16`