CVE-2026-2340

Samba: vfs_worm does not block directory modification

MEDIUM 6.5

At a glance

Source: NVD
EPSS: EPSS 0.94 % · percentile 61 (2026-10-28)
State: PUBLISHED
Published: 2026-05-27 12:09 UTC
Updated: 2026-10-15 16:58 UTC
Assigner: redhat
NVD status: Modified

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.

Weaknesses (CWE)

CWE-280

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N	redhat
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N	NVD · secalert@redhat.com (Secondary)

European references

ENISA EUVD · EUVD-2026-32312
GCVE · GCVE-0-2026-2340

CERT-FR advisories

CERTFR-2026-AVI-0651 — Multiples vulnérabilités dans Samba · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* ≥ 4.1.0
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:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

Affected products

Product	Versions
Red Hat · Red Hat Enterprise Linux 10	unaffected 0:4.23.5-109.el10_2 < *
Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support	unaffected 0:4.21.3-114.el10_0.1 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:4.19.4-16.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:4.19.4-16.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	unaffected 0:4.15.5-16.el8_6.1 < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	unaffected 0:4.15.5-16.el8_6.1 < *
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service	unaffected 0:4.17.5-7.el8_8.1 < *
Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	unaffected 0:4.17.5-7.el8_8.1 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:4.23.5-10.el9_8 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:4.23.5-10.el9_8 < *
Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	unaffected 0:4.17.5-105.el9_2.5 < *
Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	unaffected 0:4.19.4-105.el9_4.4 < *
Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support	unaffected 0:4.21.3-14.el9_6.1 < *
Red Hat · Red Hat OpenShift Container Platform 4.12	unaffected 412.86.202608241157-0 < *
Red Hat · Red Hat OpenShift Container Platform 4.12	unaffected 412.86.202609082051-0 < *
Red Hat · Red Hat OpenShift Container Platform 4.13	unaffected 413.92.202609080414-0 < *
Red Hat · Red Hat OpenShift Container Platform 4.13	unaffected 413.92.202609302032-0 < *
Red Hat · Red Hat OpenShift Container Platform 4.14	unaffected 414.92.202608172040-0 < *
Red Hat · Red Hat OpenShift Container Platform 4.14	unaffected 414.92.202609011250-0 < *
Red Hat · Red Hat OpenShift Container Platform 4.15	unaffected 415.92.202608180329-0 < *

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD