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Samba Read-Only Share NTFS Reparse Point Bypasses SMB-Layer Access Checks, Allowing Writes Through the Reparse Target

Last refreshed2026-10-10

Status: UPDATED  |  Advisory ID: CVE-2026-1933

Key Details

CVECVE-2026-1933
CVSS Score / Version7.1 (High) / CVSS v3.1
Updated2026-10-08
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CVSS Proseattack vector is network; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is low; availability impact is high.
Affected productssee table below
Classified asCWE-284 (Improper Access Control)

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
Red HatEnterprise Linux
Red HatOpenShift Container Platform
Red HatRed Hat Enterprise Linux 10
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
Red HatRed Hat Enterprise Linux 8
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
Red HatRed Hat Enterprise Linux 9
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support
Red HatRed Hat Enterprise Linux 7
Red HatRed Hat OpenShift Container Platform 4.12
Red HatRed Hat OpenShift Container Platform 4.13
Red HatRed Hat OpenShift Container Platform 4.14
Red HatRed Hat OpenShift Container Platform 4.15
Red HatRed Hat OpenShift Container Platform 4.16
Red HatRed Hat OpenShift Container Platform 4.17
Red HatRed Hat OpenShift Container Platform 4.18
Red HatRed Hat OpenShift Container Platform 4.19
Red HatRed Hat OpenShift Container Platform 4
Red HatRed Hat OpenShift Container Platform 4.20
Red HatRed Hat OpenShift Container Platform 4.21
Red HatRed Hat OpenShift Container Platform 4.22
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

A flaw was found in Samba’s handling of NTFS-style reparse points on shares configured with read only = yes. Due to missing SMB-layer access checks, authenticated users with underlying filesystem write permissions may create or delete reparse point metadata through SMB operations even on read-only exports. This could allow modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types. (NVD)

What to Do

Monitor Red Hat's web page for any future patch releases. See vendor advisory link below.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-1933
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-1933
Vendor advisoryhttps://bugzilla.samba.org/show_bug.cgi?id=15992