# CVE-2025-71150: ksmbd: Fix refcount leak when invalid session is found on session lookup

CVE-2025-71150 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-71150, released January 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-71150
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 23, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-71150

## Description

In the Linux kernel, the following vulnerability has been resolved:  ksmbd: Fix refcount leak when invalid session is found on session lookup  When a session is found but its state is not SMB2_SESSION_VALID, It indicates that no valid session was found, but it is missing to decrement the reference count acquired by the session lookup, which results in a reference count leak. This patch fixes the issue by explicitly calling ksmbd_user_session_put to release the reference to the session.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.162-1 | [DEBIAN-CVE-2025-71150](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71150.md) | Jan 23, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.69-1 | [DEBIAN-CVE-2025-71150](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71150.md) | Jan 23, 2026 |
| Linux | linux Debian 14 | 6.18.3-1 | [DEBIAN-CVE-2025-71150](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71150.md) | Jan 23, 2026 |

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Data as of 2026-11-09T19:38:12Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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