Detections
Analytics

Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Samba vulnerabilities (USN-8306-1)

high Nessus Plugin ID 317099

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8306-1 advisory.

 Asim Viladi Oglu Manizada discovered that Samba incorrectly handled access checks on reparse point operations. An attacker could possibly use this issue to modify reparse point extended attributes on files that should have been read-only. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS.
 (CVE-2026-1933)

 Pavel Kohout discovered that Samba's vfs_worm module did not properly block file overwrites. An attacker could possibly use this issue to overwrite files that should have remained immutable. (CVE-2026-2340)

 Arad Inbar, Nir Somech, and Ben Grinberg discovered that Samba incorrectly handled certificate auto- enrolment group policies over HTTP without verification. A machine-in-the-middle attacker could possibly use this issue to install a malicious CA certificate. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-3012)

 Arad Inbar, Erez Cohen, Nir Somech, and Ben Grinberg discovered that Samba's Active Directory Domain Controller WINS server could be made to crash under certain circumstances. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-3238)

 Ron Ben Yizhak discovered that Samba's DCE/RPC SAMR server incorrectly handled a non-default password check script configuration. A remote attacker could possibly use this issue to execute arbitrary code.
 (CVE-2026-4408)

 Ron Ben Yizhak discovered that Samba's printing subsystem incorrectly handled a non-default print command configuration. A remote attacker could possibly use this issue to execute arbitrary code. (CVE-2026-4480)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8306-1

Plugin Details

Severity: High

ID: 317099

File Name: ubuntu_USN-8306-1.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 5/27/2026

Updated: 5/29/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:C

CVSS Score Source: CVE-2026-1933

CVSS v3

Risk Factor: High

Base Score: 8

Temporal Score: 7

Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-3012

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libldb-dev, p-cpe:/a:canonical:ubuntu_linux:samba-vfs-modules, p-cpe:/a:canonical:ubuntu_linux:libtevent0t64, p-cpe:/a:canonical:ubuntu_linux:tdb-tools, p-cpe:/a:canonical:ubuntu_linux:python3-tdb, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libtdb-dev, p-cpe:/a:canonical:ubuntu_linux:libpam-winbind, p-cpe:/a:canonical:ubuntu_linux:samba-common, p-cpe:/a:canonical:ubuntu_linux:samba-vfs-glusterfs, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:libtevent-dev, p-cpe:/a:canonical:ubuntu_linux:samba-dev, p-cpe:/a:canonical:ubuntu_linux:libwbclient0, p-cpe:/a:canonical:ubuntu_linux:samba-common-bin, p-cpe:/a:canonical:ubuntu_linux:samba-ad-provision, p-cpe:/a:canonical:ubuntu_linux:libwbclient-dev, p-cpe:/a:canonical:ubuntu_linux:winbind, p-cpe:/a:canonical:ubuntu_linux:samba-dsdb-modules, p-cpe:/a:canonical:ubuntu_linux:python3-samba, p-cpe:/a:canonical:ubuntu_linux:registry-tools, p-cpe:/a:canonical:ubuntu_linux:libtalloc2, p-cpe:/a:canonical:ubuntu_linux:samba-testsuite, p-cpe:/a:canonical:ubuntu_linux:smbclient, p-cpe:/a:canonical:ubuntu_linux:libsmbclient0, p-cpe:/a:canonical:ubuntu_linux:python3-talloc, p-cpe:/a:canonical:ubuntu_linux:ldb-tools, p-cpe:/a:canonical:ubuntu_linux:ctdb, p-cpe:/a:canonical:ubuntu_linux:samba-vfs-ceph, p-cpe:/a:canonical:ubuntu_linux:samba-libs, p-cpe:/a:canonical:ubuntu_linux:libsmbclient, p-cpe:/a:canonical:ubuntu_linux:samba-ad-dc, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libnss-winbind, p-cpe:/a:canonical:ubuntu_linux:samba-vfs-modules-extra, p-cpe:/a:canonical:ubuntu_linux:libtalloc-dev, p-cpe:/a:canonical:ubuntu_linux:python3-ldb, p-cpe:/a:canonical:ubuntu_linux:libtdb1, p-cpe:/a:canonical:ubuntu_linux:samba, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libsmbclient-dev, p-cpe:/a:canonical:ubuntu_linux:python3-ldb-dev, p-cpe:/a:canonical:ubuntu_linux:libldb2

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 5/26/2026

Vulnerability Publication Date: 5/26/2026

Reference Information

CVE: CVE-2026-1933, CVE-2026-2340, CVE-2026-3012, CVE-2026-3238, CVE-2026-4408, CVE-2026-4480

IAVA: 2026-A-0510

USN: 8306-1