What’s Vulnerable › Vulnerabilities

CVE-2023-32246: ksmbd: call rcu_barrier() in ksmbd_server_exit()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-16 · updated 2026-08-15

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: call rcu_barrier() in ksmbd_server_exit() racy issue is triggered the bug by racing between closing a connection and rmmod. In ksmbd, rcu_barrier() is not called at module unload time, so nothing prevents ksmbd from getting unloaded while it still has RCU callbacks pending. It leads to trigger unintended execution of kernel code locally and use to defeat protections such as Kernel Lockdown

Affected products

• Linux kernel: from 5.15 before 5.15.111; from 5.16 before 6.1.28; from 6.2 before 6.2.15; from 6.3 before 6.3.2 — fixed in 5.15.111, 6.1.28, 6.2.15, 6.3.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.111, 6.1.28, 6.2.15, 6.3.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5a7090ccc242ab009ee7769e9d7fad6644dbe9bd
• https://git.kernel.org/stable/c/b80422474ffe44cb5e813cd6da1f1c6bc50fd9d2
• https://git.kernel.org/stable/c/c053e389db0d892e2ff5a60ec5e533b976503795
• https://git.kernel.org/stable/c/d4174505016a3b2996eb7ff1530dcabbf15d47b6
• https://git.kernel.org/stable/c/eb307d09fe15844fdaebeb8cc8c9b9e925430aa5

Get alerted when CVE-2023-32246 or the next vulnerability affects your stack