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[USN-7826-2] Samba vulnerabilities

Posted on 20 October 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7826-2
October 20, 2025

samba vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Samba.

Software Description:
- samba: SMB/CIFS file, print, and login server for Unix

Details:

USN-7826-1 fixed vulnerabilities in Samba. This update provides the
corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu
18.04 LTS and Ubuntu 20.04 LTS.

Original advisory details:

Andrew Walker discovered that Samba incorrectly initialized memory in the
vfs_streams_xattr module. An authenticated attacker could possibly use this
issue to obtain sensitive information. (CVE-2025-9640)

Igor Morgenstern discovered that Samba incorrectly handled names passed to
the WINS hook program. An attacker could possibly use this issue to execute
arbitrary code. (CVE-2025-10230)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
samba 2:4.15.13+dfsg-0ubuntu0.20.04.8+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm3
Available with Ubuntu Pro

Ubuntu 16.04 LTS
samba 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4
Available with Ubuntu Pro

Ubuntu 14.04 LTS
samba 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7826-2
https://ubuntu.com/security/notices/USN-7826-1
CVE-2025-10230, CVE-2025-9640

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