# CVE-2026-99114: ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION

CVE-2026-99114 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99114, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-99114
- Priority: Routine
- CVSS: 3.1 (Low)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 28, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99114

## Description

In the Linux kernel, the following vulnerability has been resolved:  ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION  smb2_get_info_filesystem() reports 48 bytes for FS_CONTROL_INFORMATION, that is the whole of struct smb2_fs_control_info, but never assigns FileSystemControlFlags.  Those four bytes go to the client as they are found in the response buffer.  The buffer is zeroed on allocation, so a standalone request leaks nothing.  A compound request can leak: the offset of the next response is advanced by the length pinned for the previous one, so a reply that was written into the buffer and then dropped in favour of the short error response of smb2_set_err_rsp() stays there, and the next reply is laid over it with only the header cleared.  ksmbd does not implement quota tracking, so report no control flags.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-99114](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99114.md) | Nov 3, 2026 |
| Linux | linux Debian 14 | 7.2.13-1 | [DEBIAN-CVE-2026-99114](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99114.md) | Nov 3, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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