CVE-2026-2340

MEDIUM

Samba: vfs_worm does not block directory modification

Title source: cna
STIX 2.1

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.

References (13)

Core 13
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:22963
https://access.redhat.com/errata/RHSA-2026:22963
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:25049
https://access.redhat.com/errata/RHSA-2026:25049
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:25979
https://access.redhat.com/errata/RHSA-2026:25979
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-2340
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:22644
https://access.redhat.com/errata/RHSA-2026:22644
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:28053
https://access.redhat.com/errata/RHSA-2026:28053
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:28054
https://access.redhat.com/errata/RHSA-2026:28054
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:28055
https://access.redhat.com/errata/RHSA-2026:28055
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:28056
https://access.redhat.com/errata/RHSA-2026:28056
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:28057
https://access.redhat.com/errata/RHSA-2026:28057
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:29863
https://access.redhat.com/errata/RHSA-2026:29863
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2447318
https://bugzilla.redhat.com/show_bug.cgi?id=2447318

Scores

CVSS v3 6.5
EPSS 0.0094
EPSS Percentile 57.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-280
Status published
Products (24)
Red Hat/Red Hat Enterprise Linux 10
Red Hat/Red Hat Enterprise Linux 10 0:4.23.5-109.el10_2
Red Hat/Red Hat Enterprise Linux 10.0 Extended Update Support 0:4.21.3-114.el10_0.1
Red Hat/Red Hat Enterprise Linux 6
Red Hat/Red Hat Enterprise Linux 7
Red Hat/Red Hat Enterprise Linux 8
Red Hat/Red Hat Enterprise Linux 8 0:4.19.4-16.el8_10
Red Hat/Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:4.15.5-16.el8_6.1
Red Hat/Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:4.15.5-16.el8_6.1
Red Hat/Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:4.17.5-7.el8_8.1
... and 14 more
Published May 27, 2026
Tracked Since May 27, 2026