CVE-2026-2340

Publication date 26 May 2026

Last updated 27 May 2026

Ubuntu priority

Why this priority?

Description

WORM vfs module does not block overwrites

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	26.04 LTS resolute	Fixed 2:4.23.6+dfsg-1ubuntu2.1
	25.10 questing	Fixed 2:4.22.3+dfsg-4ubuntu2.4
	24.04 LTS noble	Fixed 2:4.19.5+dfsg-4ubuntu9.6
	22.04 LTS jammy	Fixed 2:4.15.13+dfsg-0ubuntu1.12
	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

Per upstream "The vfs_worm module was added in 4.2 (2015), but was found to be insufficient (see https://bugzilla.samba.org/show_bug.cgi?id=10430). It was largely repaired for Samba 4.20, but this bug remained." Only affects configurations where vfs_worm is enabled, which is not the default.

References

Related Ubuntu Security Notices (USN)

USN-8306-1
Samba vulnerabilities
26 May 2026

Other references

https://www.cve.org/CVERecord?id=CVE-2026-2340