Samba Vulnerability in NTFS-Style Reparse Points in Read-Only Shares
CVE-2026-1933

7.1HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
Vendor
CVE Published:
27 May 2026

What is CVE-2026-1933?

A security issue exists in Samba related to its handling of NTFS-style reparse points on shares configured with read-only permissions. This flaw enables authenticated users with write access on the underlying filesystem to create or modify reparse point metadata via SMB operations, even when the shares are set to read-only. As a result, it may lead to unintended alterations in file behavior visible through SMB, potentially allowing files to be transformed into symbolic links or other types of reparse points, which can pose significant security risks.

Affected Version(s)

Red Hat Enterprise Linux 10 0:4.23.5-109.el10_2

Red Hat Enterprise Linux 10.0 Extended Update Support 0:4.21.3-114.el10_0.1

Red Hat Enterprise Linux 8 0:4.19.4-16.el8_10

References

https://access.redhat.com/errata/RHSA-2026:22644
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22963
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25049
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Asim Viladi Oglu Manizada for reporting this issue.
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