UBUNTU-CVE-2025-0620

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Source
https://ubuntu.com/security/CVE-2025-0620
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-0620.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-0620
Upstream
Downstream
Related
Withdrawn
2026-01-20T05:24:58Z
Published
2025-06-03T00:00:00Z
Modified
2026-02-04T03:20:45.475023Z
Severity
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:25.04 / samba

Package

Name
samba
Purl
pkg:deb/ubuntu/samba@2:4.21.4+dfsg-1ubuntu3.1?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:4.21.4+dfsg-1ubuntu3.1

Affected versions

2:4.*
2:4.20.4+dfsg-1ubuntu1
2:4.20.4+dfsg-1ubuntu2
2:4.20.4+dfsg-1ubuntu3
2:4.20.4+dfsg-1ubuntu5
2:4.21.4+dfsg-1ubuntu2
2:4.21.4+dfsg-1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ctdb",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "ldb-tools",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libldb-dev",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libldb2",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libnss-winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libpam-winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libsmbclient-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libsmbclient0",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libtalloc-dev",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libtalloc2",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libtdb-dev",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libtdb1",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libtevent-dev",
            "binary_version": "2:0.16.1+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libtevent0t64",
            "binary_version": "2:0.16.1+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libwbclient-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "libwbclient0",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "python3-ldb",
            "binary_version": "2:2.10.0+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "python3-samba",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "python3-talloc",
            "binary_version": "2:2.4.2+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "python3-tdb",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "registry-tools",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-ad-dc",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-ad-provision",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-common",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-common-bin",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-dev",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-dsdb-modules",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-libs",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-testsuite",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-vfs-ceph",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-vfs-glusterfs",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-vfs-modules",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "samba-vfs-modules-extra",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "smbclient",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "tdb-tools",
            "binary_version": "2:1.4.12+samba4.21.4+dfsg-1ubuntu3.1"
        },
        {
            "binary_name": "winbind",
            "binary_version": "2:4.21.4+dfsg-1ubuntu3.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-0620.json"