---
id: CVE-2025-38265
title: 'serial: jsm: fix NPE during jsm_uart_port_init'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  serial: jsm: fix NPE during jsm_uart_port_init

  No device was set which caused serial_base_ctrl_add to crash.

   BUG: kernel NULL pointer dereference, address: 000000000…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a <
    3258d7ff8ebfa451426662b23e8f2b51b129afe1
  - >-
    Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a <
    985961dd2688a527a4847300d41beaad475ab7af
  - >-
    Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a <
    a14c0d2eb3f0b1836fdec22908b87ecffd2ac844
  - >-
    Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a <
    abaecb2a4ad021c2f2426e9b2a9c020aef57aca9
  - >-
    Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a <
    e3975aa899c0a3bbc10d035e699b142cd1373a71
  - Linux 6.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:52:37.746503Z'
published: '2025-07-10'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:02:29.652Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-38265'
references:
  - url: 'https://git.kernel.org/stable/c/3258d7ff8ebfa451426662b23e8f2b51b129afe1'
  - url: 'https://git.kernel.org/stable/c/985961dd2688a527a4847300d41beaad475ab7af'
  - url: 'https://git.kernel.org/stable/c/a14c0d2eb3f0b1836fdec22908b87ecffd2ac844'
  - url: 'https://git.kernel.org/stable/c/abaecb2a4ad021c2f2426e9b2a9c020aef57aca9'
  - url: 'https://git.kernel.org/stable/c/e3975aa899c0a3bbc10d035e699b142cd1373a71'
tags:
  - cve.org
epss: 0.00189
epssPercentile: 0.08527
ingestedAt: '2026-11-05T22:38:31.944Z'
---

## Overview

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

serial: jsm: fix NPE during jsm_uart_port_init

No device was set which caused serial_base_ctrl_add to crash.

 BUG: kernel NULL pointer dereference, address: 0000000000000050
 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
 CPU: 16 UID: 0 PID: 368 Comm: (udev-worker) Not tainted 6.12.25-amd64 #1  Debian 6.12.25-1
 RIP: 0010:serial_base_ctrl_add+0x96/0x120
 Call Trace:
  <TASK>
  serial_core_register_port+0x1a0/0x580
  ? __setup_irq+0x39c/0x660
  ? __kmalloc_cache_noprof+0x111/0x310
  jsm_uart_port_init+0xe8/0x180 [jsm]
  jsm_probe_one+0x1f4/0x410 [jsm]
  local_pci_probe+0x42/0x90
  pci_device_probe+0x22f/0x270
  really_probe+0xdb/0x340
  ? pm_runtime_barrier+0x54/0x90
  ? __pfx___driver_attach+0x10/0x10
  __driver_probe_device+0x78/0x110
  driver_probe_device+0x1f/0xa0
  __driver_attach+0xba/0x1c0
  bus_for_each_dev+0x8c/0xe0
  bus_add_driver+0x112/0x1f0
  driver_register+0x72/0xd0
  jsm_init_module+0x36/0xff0 [jsm]
  ? __pfx_jsm_init_module+0x10/0x10 [jsm]
  do_one_initcall+0x58/0x310
  do_init_module+0x60/0x230

Tested with Digi Neo PCIe 8 port card.

## Affected

- `Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < 3258d7ff8ebfa451426662b23e8f2b51b129afe1`
- `Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < 985961dd2688a527a4847300d41beaad475ab7af`
- `Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < a14c0d2eb3f0b1836fdec22908b87ecffd2ac844`
- `Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < abaecb2a4ad021c2f2426e9b2a9c020aef57aca9`
- `Linux >= 84a9582fd203063cd4d301204971ff2cd8327f1a < e3975aa899c0a3bbc10d035e699b142cd1373a71`
- `Linux 6.5`

## Remediation

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