---
id: CVE-2024-27390
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()

  As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops
  in igmp6_event_query() and igmp…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()

  As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops
  in igmp6_event_query() and igmp…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.13, < 5.15.153'
  - 'linux_kernel >= 5.16, < 6.1.83'
  - 'linux_kernel >= 6.2, < 6.6.23'
  - 'linux_kernel >= 6.7, < 6.7.11'
  - 'linux_kernel >= 6.8, < 6.8.2'
patched:
  - linux_kernel 6.8.2
published: '2024-05-01'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-27390'
references:
  - url: 'https://git.kernel.org/stable/c/17ef8efc00b34918b966388b2af0993811895a8c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/26d4bac55750d535f1f0b8790dc26daf6089e373'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5da9a218340a2bc804dc4327e5804392e24a0b88'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7eb06ee5921189812e6b4bfe7b0f1e878be16df7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9d159d6637ccce25f879d662a480541ef4ba3a50'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a03ede2282ebbd181bd6f5c38cbfcb5765afcd04'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bfd2f3c58ad86ad33db80515e6c3503e0414e44b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/17ef8efc00b34918b966388b2af0993811895a8c'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/26d4bac55750d535f1f0b8790dc26daf6089e373'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/5da9a218340a2bc804dc4327e5804392e24a0b88'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/7eb06ee5921189812e6b4bfe7b0f1e878be16df7'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/9d159d6637ccce25f879d662a480541ef4ba3a50'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/a03ede2282ebbd181bd6f5c38cbfcb5765afcd04'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00223
epssPercentile: 0.11535
ingestedAt: '2026-07-24T15:30:57.291Z'
---

## Overview

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

ipv6: mcast: remove one synchronize_net() barrier in ipv6_mc_down()

As discussed in the past (commit 2d3916f31891 ("ipv6: fix skb drops
in igmp6_event_query() and igmp6_event_report()")) I think the
synchronize_net() call in ipv6_mc_down() is not needed.

Under load, synchronize_net() can last between 200 usec and 5 ms.

KASAN seems to agree as well.

## Affected

- `linux_kernel >= 5.13, < 5.15.153`
- `linux_kernel >= 5.16, < 6.1.83`
- `linux_kernel >= 6.2, < 6.6.23`
- `linux_kernel >= 6.7, < 6.7.11`
- `linux_kernel >= 6.8, < 6.8.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.8.2`