---
id: CVE-2026-90164
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb/server: abort initialization when proc setup fails

  ksmbd_server_init() calls ksmbd_proc_init() before creating the
  remaining proc entries and server subsystems
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb/server: abort initialization when proc setup fails

  ksmbd_server_init() calls ksmbd_proc_init() before creating the
  remaining proc entries and server subsystems. ks…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b38f99c1217ae04753340f0fdcd8f35bf56841dc <
    fb4ba2bdfc1de8866e7c8e00df99f4b03ff42f09
  - >-
    Linux >= b38f99c1217ae04753340f0fdcd8f35bf56841dc <
    db97f3763727d652112ae70038d4e17b3ce277bb
  - Linux 7.0
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:09.747'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90164'
references:
  - url: 'https://git.kernel.org/stable/c/db97f3763727d652112ae70038d4e17b3ce277bb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fb4ba2bdfc1de8866e7c8e00df99f4b03ff42f09'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.871Z'
epss: 0.00198
epssPercentile: 0.08464
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

smb/server: abort initialization when proc setup fails

ksmbd_server_init() calls ksmbd_proc_init() before creating the
remaining proc entries and server subsystems. ksmbd_proc_init() tears
down partial state on a procfs or percpu_counter allocation failure,
but returns void, so ksmbd_server_init() continues as if the counters
were usable.

Once userspace starts the server, server_ctrl_handle_init() calls
ksmbd_proc_reset(), which reaches percpu_counter_set() with a NULL
per-CPU counters pointer on SMP systems. The later ksmbd_proc_create()
calls also receive a NULL parent and may create entries in the /proc
root; ksmbd_proc_cleanup() cannot remove those entries because
ksmbd_proc_fs is NULL.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.