CVE-2023-32246

ksmbd: call rcu_barrier() in ksmbd_server_exit()

MEDIUM

5.5

CVSS Score

Published: August 16, 2025 at 01:22 PM UTC

Updated: August 15, 2026 at 01:36 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

5.15 ≤ v < 5.15.1115.15 ≤ v < 6.1.285.15 ≤ v < 6.2.155.15 ≤ v < 6.3.25.15 ≤ v < 6.45.16 ≤ v < 6.1.286.2 ≤ v < 6.2.156.3 ≤ v < 6.3.25.15e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9

Vendor states this is fixed in 5a7090ccc242ab009ee7769e9d7fad6644dbe9bd (fixed)

Vendor states this is fixed in b80422474ffe44cb5e813cd6da1f1c6bc50fd9d2 (fixed)

Vendor states this is fixed in c053e389db0d892e2ff5a60ec5e533b976503795 (fixed)

Vendor states this is fixed in d4174505016a3b2996eb7ff1530dcabbf15d47b6 (fixed)

Vendor states this is fixed in eb307d09fe15844fdaebeb8cc8c9b9e925430aa5 (fixed)

Vendor states this is fixed in 5.15 (unaffected)

Vendor states this is fixed in 5.15.111 (unaffected)

Vendor states this is fixed in 6.1.28 (unaffected)

Vendor states this is fixed in 6.2.15 (unaffected)

Vendor states this is fixed in 6.3.2 (unaffected)

Vendor states this is fixed in 6.4 (unaffected)