UBUNTU-CVE-2026-1933

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2026-1933

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1933.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-1933

Upstream

CVE-2026-1933

Downstream

USN-8306-1

Related

USN-8306-1

Published

2026-05-26T00:00:00Z

Modified

2026-06-04T12:45:25.457026084Z

Severity

7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

A flaw was found in Samba’s handling of NTFS-style reparse points on shares configured with read only = yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write permissions may create or delete reparse point metadata through SMB operations even on read-only exports. This could allow modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types.

References

Affected packages

Ubuntu:25.10 / samba

Package

Name: samba
Purl: pkg:deb/ubuntu/samba?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:4.22.3+dfsg-4ubuntu2.4

Affected versions

2:4.*

2:4.21.4+dfsg-1ubuntu3

2:4.21.4+dfsg-1ubuntu4

2:4.21.4+dfsg-1ubuntu5

2:4.22.2+dfsg-1ubuntu1

2:4.22.3+dfsg-4ubuntu1

2:4.22.3+dfsg-4ubuntu2

2:4.22.3+dfsg-4ubuntu2.1

2:4.22.3+dfsg-4ubuntu2.2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "ctdb",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libldb2",
            "binary_version": "2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libtalloc2",
            "binary_version": "2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.16.2+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-samba",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-talloc",
            "binary_version": "2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "python3-tdb",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "registry-tools",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-common",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-libs",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-glusterfs",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "smbclient",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "tdb-tools",
            "binary_version": "2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4"
        },
        {
            "binary_name": "winbind",
            "binary_version": "2:4.22.3+dfsg-4ubuntu2.4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1933.json"

Ubuntu:26.04:LTS / samba

Package

Name: samba
Purl: pkg:deb/ubuntu/samba?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:4.23.6+dfsg-1ubuntu2.1

Affected versions

2:4.*

2:4.22.3+dfsg-4ubuntu2

2:4.22.3+dfsg-4ubuntu2.1

2:4.22.3+dfsg-4ubuntu3

2:4.22.3+dfsg-4ubuntu4

2:4.23.4+dfsg-1ubuntu1

2:4.23.5+dfsg-1ubuntu2

2:4.23.6+dfsg-1ubuntu1

2:4.23.6+dfsg-1ubuntu2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "ctdb",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libldb2",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libtalloc2",
            "binary_version": "2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.17.1+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-samba",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-talloc",
            "binary_version": "2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "python3-tdb",
            "binary_version": "2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "registry-tools",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-common",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-libs",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-glusterfs",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "smbclient",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "tdb-tools",
            "binary_version": "2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1"
        },
        {
            "binary_name": "winbind",
            "binary_version": "2:4.23.6+dfsg-1ubuntu2.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1933.json"