CVE-2026-40226

Publication date 10 April 2026

Last updated 6 June 2026

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
systemd	26.04 LTS resolute	Not affected
	25.10 questing	Needs evaluation
	24.04 LTS noble	Needs evaluation
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Notes

mdeslaur

Fixed in 260 259.4 258.6 257.12

Patch details

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

Package	Patch details
systemd	Upstream: 61bceb1 Upstream: 7b85f54 Upstream: 773fd3b Upstream: bfa0a84

Severity score breakdown

Parameter	Value
Base score	6.4 · Medium
Attack vector	Local
Attack complexity	High
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

References

Other references

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