CVE-2023-5366

Publication date 6 October 2023

Last updated 19 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in Open vSwitch that allows ICMPv6 Neighbor Advertisement packets between virtual machines to bypass OpenFlow rules. This issue may allow a local attacker to create specially crafted packets with a modified or spoofed target IP address field that can redirect ICMPv6 traffic to arbitrary IP addresses.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openvswitch	25.10 questing	Fixed 3.3.0~git20240118.e802fe7-3ubuntu1
	25.04 plucky	Fixed 3.3.0~git20240118.e802fe7-3ubuntu1
	24.10 oracular	Fixed 3.3.0~git20240118.e802fe7-3ubuntu1
	24.04 LTS noble	Fixed 3.3.0~git20240118.e802fe7-3ubuntu1
	23.10 mantic	Fixed 3.2.2-0ubuntu0.23.10.1
	23.04 lunar	Ignored end of life
	22.04 LTS jammy	Fixed 2.17.9-0ubuntu0.22.04.1
	20.04 LTS focal	Fixed 2.13.8-0ubuntu1.4
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Ignored changes too intrusive
	14.04 LTS trusty	Ignored end of standard support

Notes

mdeslaur

This was originally marked as fixed in USN-6514-1, but the fix was incomplete. See the ovs-announce list post for the new commits to fix this issue. The bp commits below are required in addition to the other commits.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
openvswitch	Upstream: 61003d0 Upstream: 7570744 Upstream: d3f9eab Upstream: a6c0a3d Upstream: e235a42 Upstream: 694c7b4 Upstream: 489553b Upstream: 132fa24

Severity score breakdown

Parameter	Value
Base score	7.1 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H