CVE-2025-37899highobserved exploitation

ksmbd: fix use-after-free in session logoff

43Vexday Risk Score

Prioritize patching. It exploitation observed by VulnCheck.

ssvc Actcvss 8.8epss 0.9%

from disclosure to weapon

Published on NVDMay 20

VulnCheck+142d

exploitation probability

0.9%top 43% of all CVEs

observed exploitation

yesVulnCheck

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.

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

Affected products

Linux · Linux

References

https://git.kernel.org/stable/c/02d16046cd11a5c037b28c12ffb818c56dd3ef43 https://git.kernel.org/stable/c/2fc9feff45d92a92cd5f96487655d5be23fb7e2b https://git.kernel.org/stable/c/70ad6455139e26e85f48f95d0e21f351c1909342 https://git.kernel.org/stable/c/931dc8a3670f71c45c0b1379ea4e92dafbda1aca https://git.kernel.org/stable/c/d5ec1d79509b3ee01de02c236f096bc050221b7f 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/