ubuntu-cve-2026-2340
Vulnerability from osv_ubuntu
Published
2026-05-26 00:00
Modified
2026-06-09 23:25
Summary
Details
A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "libsmbclient",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "python3-samba",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "samba",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
},
{
"binary_name": "winbind",
"binary_version": "2:4.15.13+dfsg-0ubuntu1.12"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.15.13+dfsg-0ubuntu1.12?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.15.13+dfsg-0ubuntu1.12"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:4.13.5+dfsg-2ubuntu2",
"2:4.13.5+dfsg-2ubuntu3",
"2:4.13.14+dfsg-0ubuntu1",
"2:4.13.14+dfsg-0ubuntu2",
"2:4.15.5~dfsg-0ubuntu1",
"2:4.15.5~dfsg-0ubuntu2",
"2:4.15.5~dfsg-0ubuntu4",
"2:4.15.5~dfsg-0ubuntu5",
"2:4.15.5~dfsg-0ubuntu5.1",
"2:4.15.9+dfsg-0ubuntu0.2",
"2:4.15.9+dfsg-0ubuntu0.3",
"2:4.15.13+dfsg-0ubuntu1",
"2:4.15.13+dfsg-0ubuntu1.1",
"2:4.15.13+dfsg-0ubuntu1.2",
"2:4.15.13+dfsg-0ubuntu1.3",
"2:4.15.13+dfsg-0ubuntu1.4",
"2:4.15.13+dfsg-0ubuntu1.5",
"2:4.15.13+dfsg-0ubuntu1.6",
"2:4.15.13+dfsg-0ubuntu1.7",
"2:4.15.13+dfsg-0ubuntu1.8",
"2:4.15.13+dfsg-0ubuntu1.9",
"2:4.15.13+dfsg-0ubuntu1.10"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ctdb",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "ldb-tools",
"binary_version": "2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "libldb2",
"binary_version": "2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "libnss-winbind",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "libpam-winbind",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "libsmbclient0",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "libwbclient0",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "python3-ldb",
"binary_version": "2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "python3-samba",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "registry-tools",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-ad-dc",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-ad-provision",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-common",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-common-bin",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-dsdb-modules",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-libs",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-testsuite",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-vfs-modules",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "samba-vfs-modules-extra",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "smbclient",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
},
{
"binary_name": "winbind",
"binary_version": "2:4.19.5+dfsg-4ubuntu9.6"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.19.5+dfsg-4ubuntu9.6?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.19.5+dfsg-4ubuntu9.6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:4.18.6+dfsg-1ubuntu2",
"2:4.18.6+dfsg-1ubuntu2.1",
"2:4.18.6+dfsg-1ubuntu2.2",
"2:4.19.4+dfsg-3ubuntu1",
"2:4.19.5+dfsg-1ubuntu1",
"2:4.19.5+dfsg-4ubuntu7",
"2:4.19.5+dfsg-4ubuntu8",
"2:4.19.5+dfsg-4ubuntu9",
"2:4.19.5+dfsg-4ubuntu9.2",
"2:4.19.5+dfsg-4ubuntu9.3",
"2:4.19.5+dfsg-4ubuntu9.4"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.22.3+dfsg-4ubuntu2.4?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.22.3+dfsg-4ubuntu2.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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": "2:4.23.6+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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "samba",
"purl": "pkg:deb/ubuntu/samba@2:4.23.6+dfsg-1ubuntu2.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.23.6+dfsg-1ubuntu2.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
}
],
"aliases": [],
"details": "A flaw was found in Samba\u2019s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.",
"id": "UBUNTU-CVE-2026-2340",
"modified": "2026-06-09T23:25:45Z",
"published": "2026-05-26T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-2340"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-2340"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8306-1"
}
],
"related": [
"USN-8306-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-2340"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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