ksmbd: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-52944 affects Microsoft ksmbd version 3.0. It involves a permission bypass caused by the absence of a permission check when handling the FSCTL_SET_SPARSE file system control code. This could allow an attacker to perform actions that should require specific permissions, potentially undermining file system security controls. The advisory does not provide details on exploitation or impact severity, nor does it include patch or mitigation information.
Potential Impact
The impact is a permission bypass in the ksmbd component related to the FSCTL_SET_SPARSE operation. This could enable unauthorized users to manipulate sparse file attributes without proper authorization, potentially leading to unauthorized file system modifications. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Microsoft Security Response Center advisory for current remediation guidance. No official fix or workaround information is provided in the available data.
ksmbd: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE
Description
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-52944 affects Microsoft ksmbd version 3.0. It involves a permission bypass caused by the absence of a permission check when handling the FSCTL_SET_SPARSE file system control code. This could allow an attacker to perform actions that should require specific permissions, potentially undermining file system security controls. The advisory does not provide details on exploitation or impact severity, nor does it include patch or mitigation information.
Potential Impact
The impact is a permission bypass in the ksmbd component related to the FSCTL_SET_SPARSE operation. This could enable unauthorized users to manipulate sparse file attributes without proper authorization, potentially leading to unauthorized file system modifications. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Microsoft Security Response Center advisory for current remediation guidance. No official fix or workaround information is provided in the available data.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-52944
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- null
Threat ID: 6a42ed8527e9c79719953c8e
Added to database: 06/29/2026, 22:11:17 UTC
Last enriched: 06/29/2026, 22:47:14 UTC
Last updated: 07/04/2026, 01:40:31 UTC
Views: 3
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