linux-cve-announce - CVE-2025-38265: serial: jsm: fix NPE during jsm_uart_port

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Message-ID: <2025071035-CVE-2025-38265-be37@gregkh>
Date: Thu, 10 Jul 2025 09:37:36 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38265: serial: jsm: fix NPE during jsm_uart_port_init

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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.

The Linux kernel CVE team has assigned CVE-2025-38265 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 6.5 with commit 84a9582fd203063cd4d301204971ff2cd8327f1a and fixed in 6.6.94 with commit 3258d7ff8ebfa451426662b23e8f2b51b129afe1
	Issue introduced in 6.5 with commit 84a9582fd203063cd4d301204971ff2cd8327f1a and fixed in 6.12.33 with commit 985961dd2688a527a4847300d41beaad475ab7af
	Issue introduced in 6.5 with commit 84a9582fd203063cd4d301204971ff2cd8327f1a and fixed in 6.14.11 with commit a14c0d2eb3f0b1836fdec22908b87ecffd2ac844
	Issue introduced in 6.5 with commit 84a9582fd203063cd4d301204971ff2cd8327f1a and fixed in 6.15.2 with commit abaecb2a4ad021c2f2426e9b2a9c020aef57aca9
	Issue introduced in 6.5 with commit 84a9582fd203063cd4d301204971ff2cd8327f1a and fixed in 6.16-rc1 with commit e3975aa899c0a3bbc10d035e699b142cd1373a71

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-38265
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/tty/serial/jsm/jsm_tty.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/3258d7ff8ebfa451426662b23e8f2b51b129afe1
	https://git.kernel.org/stable/c/985961dd2688a527a4847300d41beaad475ab7af
	https://git.kernel.org/stable/c/a14c0d2eb3f0b1836fdec22908b87ecffd2ac844
	https://git.kernel.org/stable/c/abaecb2a4ad021c2f2426e9b2a9c020aef57aca9
	https://git.kernel.org/stable/c/e3975aa899c0a3bbc10d035e699b142cd1373a71