CVE-2025-0620

Publication date 3 June 2025

Last updated 9 January 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.9 · Medium

Score breakdown

Description

A flaw was found in Samba. The smbd service daemon does not pick up group membership changes when re-authenticating an expired SMB session. This issue can expose file shares until clients disconnect and then connect again.

Read the notes from the security team

Status

Package Ubuntu Release Status
samba 25.04 plucky
Fixed 2:4.21.4+dfsg-1ubuntu3.1
24.10 oracular
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

mdeslaur

only affects 4.21.0+

Patch details

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

Package Patch details
samba

Severity score breakdown

CVSS version: CVSS v3.0

Base score 4.9 · Medium

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities