# CVE-2025-39833: mISDN: hfcpci: Fix warning when deleting uninitialized timer

CVE-2025-39833 is fixed in 25 products on 1 platform, first by DEBIAN-CVE-2025-39833, released September 16, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-39833
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 16, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39833

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-64kb sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-64kb sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.52.1 | [SUSE-SU-2025:03634-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03634-1.md) | Oct 17, 2025 |
| Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.52.1 | [SUSE-SU-2025:03634-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03634-1.md) | Oct 17, 2025 |
| Linux | kernel-azure sles 15.7 | 6.4.0-150700.20.18.1 | [SUSE-SU-2025:4132-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4132-1.md) | Nov 18, 2025 |
| Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-default sles 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-default sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-default sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.73.1.150600.12.32.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.6.1.160000.2.4 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.73.1.150600.12.32.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-default-base sles 15.7 | 6.4.0-150700.53.22.1.150700.17.15.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-default-base sles 16.0 | 6.12.0-160000.6.1.160000.2.4 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-docs sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-docs sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_16 sles 15.6 | 1-150600.1.3.1 | [SUSE-SU-2025:3751-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3751-1.md) | Oct 23, 2025 |
| Linux | kernel-livepatch-SLE15-SP6_Update_16 sles 15.6 | 1-150600.13.3.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-livepatch-SLE15-SP7-RT_Update_6 sles 15.7 | 1-150700.1.3.1 | [SUSE-SU-2025:4141-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4141-1.md) | Nov 19, 2025 |
| Linux | kernel-livepatch-SLE15-SP7_Update_6 sles 15.7 | 1-150700.15.3.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-obs-build sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.55.1 | [SUSE-SU-2025:3751-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3751-1.md) | Oct 23, 2025 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.55.1 | [SUSE-SU-2025:3751-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3751-1.md) | Oct 23, 2025 |
| Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-source sles 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-source sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-source sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.52.1 | [SUSE-SU-2025:03634-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03634-1.md) | Oct 17, 2025 |
| Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.52.1 | [SUSE-SU-2025:03634-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03634-1.md) | Oct 17, 2025 |
| Linux | kernel-source-azure sles 15.7 | 6.4.0-150700.20.18.1 | [SUSE-SU-2025:4132-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4132-1.md) | Nov 18, 2025 |
| Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.55.1 | [SUSE-SU-2025:3751-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3751-1.md) | Oct 23, 2025 |
| Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-syms sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-syms sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.52.1 | [SUSE-SU-2025:03634-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03634-1.md) | Oct 17, 2025 |
| Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.52.1 | [SUSE-SU-2025:03634-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03634-1.md) | Oct 17, 2025 |
| Linux | kernel-syms-azure sles 15.7 | 6.4.0-150700.20.18.1 | [SUSE-SU-2025:4132-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4132-1.md) | Nov 18, 2025 |
| Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.55.1 | [SUSE-SU-2025:3751-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-3751-1.md) | Oct 23, 2025 |
| Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.6.1 | [OPENSUSE-SU-2025:20081-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20081-1.md) | Nov 25, 2025 |
| Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.73.1 | [SUSE-SU-2025:03600-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03600-1.md) | Oct 15, 2025 |
| Linux | kernel-zfcpdump sles 15.7 | 6.4.0-150700.53.22.1 | [SUSE-SU-2025:4057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4057-1.md) | Nov 11, 2025 |
| Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.6.1 | [SUSE-SU-2025:21139-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21139-1.md) | Nov 25, 2025 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.187-1 | [DEBIAN-CVE-2025-39833](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39833.md) | Sep 16, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2025-39833](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39833.md) | Sep 16, 2025 |
| Linux | linux Debian 14 | 6.16.5-1 | [DEBIAN-CVE-2025-39833](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39833.md) | Sep 16, 2025 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.111-1~deb12u1 | [DEBIAN-CVE-2025-39833](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39833.md) | Sep 16, 2025 |

---

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