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CVE-2025-37899

HighPublished

ksmbd: fix use-after-free in session logoff

Published: May 20, 2025
Updated: Aug 5, 2026
Assigning CNA: Linux
Evidence observed: Aug 8, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 60.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.

Sources

o3_finds_cve-2025-37899Research
Artefacts for blog post on finding CVE-2025-37899 with o3
SMB-LINUX-CVE-2025-37899Research
Technical analysis of CVE-2025-37899: a use-after-free vulnerability in Linux kernel's ksmbd SMB module enabling remote code execution. Includes attack vectors, impact assessment, and patching guidance.

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