CVE-2026-1933: Improper Access Control in Red Hat Red Hat Enterprise Linux 10
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.
AI Analysis
Technical Summary
The vulnerability CVE-2026-1933 affects Samba's handling of NTFS-style reparse points on shares configured with read only = yes. Because of missing access checks at the SMB protocol layer, authenticated users who have write permissions on the underlying filesystem can create or delete reparse point metadata via SMB operations, even on exports marked as read-only. This improper access control (CWE-284) can lead to modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types. Red Hat has issued security advisories and updates for Samba on Red Hat Enterprise Linux 10 to fix this issue.
Potential Impact
The vulnerability allows authenticated users with write permissions on the underlying filesystem to bypass read-only restrictions on Samba shares by modifying reparse point metadata. This can alter file behavior visible over SMB, potentially leading to unauthorized file redirection or manipulation. The CVSS score of 7.1 indicates a high impact with limited privileges required and no user interaction needed. There are no known exploits in the wild at the time of this advisory.
Mitigation Recommendations
Red Hat has released official security updates for Samba that address CVE-2026-1933. Users of Red Hat Enterprise Linux 10 should apply the provided Samba package updates as described in the Red Hat advisories (RHSA-2026:22963 and RHSA-2026:22644). Patch status is confirmed as fixed in these updates. No additional mitigation steps are required beyond applying the official patches.
CVE-2026-1933: Improper Access Control in Red Hat Red Hat Enterprise Linux 10
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.
CVSS v3.1
Score 7.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-1933 affects Samba's handling of NTFS-style reparse points on shares configured with read only = yes. Because of missing access checks at the SMB protocol layer, authenticated users who have write permissions on the underlying filesystem can create or delete reparse point metadata via SMB operations, even on exports marked as read-only. This improper access control (CWE-284) can lead to modification of SMB-visible file behavior, including converting files into symbolic links or other reparse point types. Red Hat has issued security advisories and updates for Samba on Red Hat Enterprise Linux 10 to fix this issue.
Potential Impact
The vulnerability allows authenticated users with write permissions on the underlying filesystem to bypass read-only restrictions on Samba shares by modifying reparse point metadata. This can alter file behavior visible over SMB, potentially leading to unauthorized file redirection or manipulation. The CVSS score of 7.1 indicates a high impact with limited privileges required and no user interaction needed. There are no known exploits in the wild at the time of this advisory.
Mitigation Recommendations
Red Hat has released official security updates for Samba that address CVE-2026-1933. Users of Red Hat Enterprise Linux 10 should apply the provided Samba package updates as described in the Red Hat advisories (RHSA-2026:22963 and RHSA-2026:22644). Patch status is confirmed as fixed in these updates. No additional mitigation steps are required beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-02-04T21:04:39.737Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-1933","vendor":"Red Hat"}]
Threat ID: 6a16f9cde29bf47b50c0e67e
Added to database: 05/27/2026, 14:03:57 UTC
Last enriched: 07/15/2026, 08:30:33 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 116
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