Samba: missing access check on reparse point operations

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.86% · top 41% of all CVEs (12 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Affected products

• 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 4.13

  • unaffected 413.92.202609080414-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.14

  • unaffected 414.92.202608172040-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.15

  • unaffected 415.92.202608180329-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.16

  • unaffected 416.94.202608150307-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.17

  • unaffected 417.94.202608250221-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.18

  • unaffected 418.94.202608142238-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.19

  • unaffected 4.19.9.6.202606241344-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.20

  • unaffected 4.20.9.6.202608121719-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.21

  • unaffected 4.21.9.6.202608122143-0 – < *

• Red Hat · Red Hat OpenShift Container Platform 4.22

  • unaffected 4.22.9.8.202608130832-0 – < *

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unknown

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unknown

• Red Hat · Red Hat Enterprise Linux 7

  All versions: affected

• Red Hat · Red Hat OpenShift Container Platform 5

  All versions: affected

What to do

Workaround: Administrators can mitigate this issue by ensuring users who access a read only = yes Samba share do not have filesystem-level write permission to the exported files. A server administrator may also monitor and remove unintended "user.SmbReparse" xattr (extended attributes) and the associated FILE_ATTRIBUTE_REPARSE_POINT "user.DosAttrib" bit metadata if exploitation is suspected.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-32275 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-1933](https://cveledger.app/badge/CVE-2026-1933.svg)](https://cveledger.app/cve/CVE-2026-1933)

Record last updated 4 Nov 2026, 22:08 UTC.