CVE-2025-37899

Published May 20, 2025

Last updated 5 days ago

Linux Kernel

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-37899 is a use-after-free vulnerability found in the ksmbd component of the Linux kernel, which is an in-kernel server implementing the SMB3 protocol for file sharing over networks. Specifically, the vulnerability exists in the session logoff handler. The vulnerability occurs because the `sess->user` object can be freed by one thread processing a logoff command while another thread, handling a new connection's session setup request, might still be accessing the same `sess->user` object. This concurrent access can lead to memory corruption and potentially allow attackers to execute arbitrary code with kernel privileges.

Description: 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.
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status: Modified
Products: linux_kernel

Risk scores

CVSS 3.1

Type: Primary
Base score: 7.8
Impact score: 5.9
Exploitability score: 1.8
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Weaknesses

nvd@nist.gov: CWE-416

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.