linux-cve-announce - CVE-2025-39833: mISDN: hfcpci: Fix warning when deleting uninitialized timer

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Message-ID: <2025091657-CVE-2025-39833-c2ef@gregkh>
Date: Tue, 16 Sep 2025 15:09:01 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39833: mISDN: hfcpci: Fix warning when deleting uninitialized timer

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

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

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

mISDN: hfcpci: Fix warning when deleting uninitialized timer

With CONFIG_DEBUG_OBJECTS_TIMERS unloading hfcpci module leads
to the following splat:

[  250.215892] ODEBUG: assert_init not available (active state 0) object: ffffffffc01a3dc0 object type: timer_list hint: 0x0
[  250.217520] WARNING: CPU: 0 PID: 233 at lib/debugobjects.c:612 debug_print_object+0x1b6/0x2c0
[  250.218775] Modules linked in: hfcpci(-) mISDN_core
[  250.219537] CPU: 0 UID: 0 PID: 233 Comm: rmmod Not tainted 6.17.0-rc2-g6f713187ac98 #2 PREEMPT(voluntary)
[  250.220940] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  250.222377] RIP: 0010:debug_print_object+0x1b6/0x2c0
[  250.223131] Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 41 56 48 8b 14 dd a0 4e 01 9f 48 89 ee 48 c7 c7 20 46 01 9f e8 cb 84d
[  250.225805] RSP: 0018:ffff888015ea7c08 EFLAGS: 00010286
[  250.226608] RAX: 0000000000000000 RBX: 0000000000000005 RCX: ffffffff9be93a95
[  250.227708] RDX: 1ffff1100d945138 RSI: 0000000000000008 RDI: ffff88806ca289c0
[  250.228993] RBP: ffffffff9f014a00 R08: 0000000000000001 R09: ffffed1002bd4f39
[  250.230043] R10: ffff888015ea79cf R11: 0000000000000001 R12: 0000000000000001
[  250.231185] R13: ffffffff9eea0520 R14: 0000000000000000 R15: ffff888015ea7cc8
[  250.232454] FS:  00007f3208f01540(0000) GS:ffff8880caf5a000(0000) knlGS:0000000000000000
[  250.233851] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  250.234856] CR2: 00007f32090a7421 CR3: 0000000004d63000 CR4: 00000000000006f0
[  250.236117] Call Trace:
[  250.236599]  <TASK>
[  250.236967]  ? trace_irq_enable.constprop.0+0xd4/0x130
[  250.237920]  debug_object_assert_init+0x1f6/0x310
[  250.238762]  ? __pfx_debug_object_assert_init+0x10/0x10
[  250.239658]  ? __lock_acquire+0xdea/0x1c70
[  250.240369]  __try_to_del_timer_sync+0x69/0x140
[  250.241172]  ? __pfx___try_to_del_timer_sync+0x10/0x10
[  250.242058]  ? __timer_delete_sync+0xc6/0x120
[  250.242842]  ? lock_acquire+0x30/0x80
[  250.243474]  ? __timer_delete_sync+0xc6/0x120
[  250.244262]  __timer_delete_sync+0x98/0x120
[  250.245015]  HFC_cleanup+0x10/0x20 [hfcpci]
[  250.245704]  __do_sys_delete_module+0x348/0x510
[  250.246461]  ? __pfx___do_sys_delete_module+0x10/0x10
[  250.247338]  do_syscall_64+0xc1/0x360
[  250.247924]  entry_SYSCALL_64_after_hwframe+0x77/0x7f

Fix this by initializing hfc_tl timer with DEFINE_TIMER macro.
Also, use mod_timer instead of manual timeout update.

The Linux kernel CVE team has assigned CVE-2025-39833 to this issue.


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

	Issue introduced in 2.6.29 with commit 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and fixed in 6.16.5 with commit 43fc5da8133badf17f5df250ba03b9d882254845
	Issue introduced in 2.6.29 with commit 87c5fa1bb42624254a2013cbbc3b170d6017f5d6 and fixed in 6.17-rc4 with commit 97766512a9951b9fd6fc97f1b93211642bb0b220

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-2025-39833
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/isdn/hardware/mISDN/hfcpci.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/43fc5da8133badf17f5df250ba03b9d882254845
	https://git.kernel.org/stable/c/97766512a9951b9fd6fc97f1b93211642bb0b220