Description
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.
Published: 2026-05-27
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Administrators can mitigate this issue by: Setting read-only permissions on protected files at the underlying filesystem level will prevent modifications. Configuring ```worm:grace_period = 0``` (zero or less) in smb.conf will eliminate the writable grace period (will eliminate the window in which the rename can happen), understanding that this may impact workflows requiring multi-step file creation.

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6297-1 samba security update
Ubuntu USN Ubuntu USN USN-8306-1 Samba vulnerabilities
History

Tue, 23 Jun 2026 08:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:rhel_e4s:9.4::appstream
cpe:/a:redhat:rhel_e4s:9.4::resilientstorage
cpe:/o:redhat:rhel_e4s:9.4::baseos
References

Tue, 23 Jun 2026 03:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat enterprise Linux Eus
Redhat rhel E4s
Redhat rhel Tus
CPEs cpe:/a:redhat:rhel_e4s:8.8::appstream
cpe:/a:redhat:rhel_e4s:9.2::appstream
cpe:/a:redhat:rhel_e4s:9.2::resilientstorage
cpe:/a:redhat:rhel_tus:8.8::appstream
cpe:/o:redhat:enterprise_linux_eus:10.0
cpe:/o:redhat:rhel_e4s:8.8::baseos
cpe:/o:redhat:rhel_e4s:9.2::baseos
cpe:/o:redhat:rhel_tus:8.8::baseos
Vendors & Products Redhat enterprise Linux Eus
Redhat rhel E4s
Redhat rhel Tus
References

Tue, 23 Jun 2026 01:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat rhel Aus
Redhat rhel Eus Long Life
CPEs cpe:/a:redhat:rhel_aus:8.6::appstream
cpe:/a:redhat:rhel_eus_long_life:8.6::appstream
cpe:/o:redhat:rhel_aus:8.6::baseos
cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
Vendors & Products Redhat rhel Aus
Redhat rhel Eus Long Life
References

Tue, 16 Jun 2026 22:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:8::appstream
cpe:/a:redhat:enterprise_linux:8::crb
cpe:/o:redhat:enterprise_linux:8::baseos
References

Mon, 15 Jun 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat rhel Eus
CPEs cpe:/a:redhat:rhel_eus:9.6::appstream
cpe:/a:redhat:rhel_eus:9.6::crb
cpe:/a:redhat:rhel_eus:9.6::resilientstorage
cpe:/o:redhat:rhel_eus:9.6::baseos
Vendors & Products Redhat rhel Eus
References

Wed, 10 Jun 2026 16:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:9 cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/a:redhat:enterprise_linux:9::crb
cpe:/a:redhat:enterprise_linux:9::resilientstorage
cpe:/o:redhat:enterprise_linux:9::baseos
References

Thu, 04 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:10.2
References

Fri, 29 May 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 28 May 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat openshift Container Platform
Samba
Samba samba
CPEs cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
Vendors & Products Redhat openshift Container Platform
Samba
Samba samba

Thu, 28 May 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 27 May 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Samba: vfs_worm does not block directory modification
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-280
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'}


Subscriptions

Redhat Enterprise Linux Enterprise Linux Eus Openshift Openshift Container Platform Rhel Aus Rhel E4s Rhel Eus Rhel Eus Long Life Rhel Tus
Samba Samba
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-06-23T08:00:06.273Z

Reserved: 2026-02-11T12:29:16.340Z

Link: CVE-2026-2340

cve-icon Vulnrichment

Updated: 2026-05-29T15:35:55.473Z

cve-icon NVD

Status : Modified

Published: 2026-05-27T14:16:44.387

Modified: 2026-06-17T13:20:15.763

Link: CVE-2026-2340

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-27T10:35:47Z

Links: CVE-2026-2340 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-30T21:22:10Z

Weaknesses