CVE-2025-37899

ksmbd: fix use-after-free in session logoff

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/d5ec1d79509b3ee01de02c236f096bc050221b7f
https://git.kernel.org/stable/c/02d16046cd11a5c037b28c12ffb818c56dd3ef43
https://git.kernel.org/stable/c/2fc9feff45d92a92cd5f96487655d5be23fb7e2b
https://news.ycombinator.com/item?id=44081338
https://sean.heelan.io/2025/05/22/how-i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/

Frequently Asked Questions

What is the severity of CVE-2025-37899?: CVE-2025-37899 has not yet been assigned a CVSS score.
How to fix CVE-2025-37899?: To fix CVE-2025-37899, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-37899 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-37899 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-37899?: CVE-2025-37899 affects Linux Linux, Linux Linux.

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