CVE-2025-39833

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2025-09-16. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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] [ 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.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

September 16, 2025

Last Modified

September 2, 2026

Advisory Details (5)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

mISDN: hfcpci: Fix warning when deleting uninitialized timer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/97766512a9951b9fd6fc97f1b93211642bb0b220
generic

mISDN: hfcpci: Fix warning when deleting uninitialized timer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/43fc5da8133badf17f5df250ba03b9d882254845
generic

mISDN: hfcpci: Fix warning when deleting uninitialized timer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/544ffd62ddd093c71150e4d4c542f98153fb8e46
generic

mISDN: hfcpci: Fix warning when deleting uninitialized timer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/75194165e65018c581b128379b91b0b2d64638d9
generic

mISDN: hfcpci: Fix warning when deleting uninitialized timer - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d8be1288e398ccda2dc590fdaa0551f192f6a1c6

Vendor Advisories for CVE-2025-39833(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.16.5—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)6.1.187-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (176 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.16~rc7-1~exp1 (63 versions)6.16.5-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 134 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-17 19:29 UTCEPSS rescore
  3. 2026-09-16 14:07 UTCEPSS rescore
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  15. 2026-09-02 13:45 UTCGHSA enrichment
  16. 2026-09-02 12:56 UTCEG score recompute
  17. 2026-09-02 12:56 UTCGHSA enrichment
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  1. 2026-08-25 03:26 UTCOSV refresh
  2. 2026-08-23 00:18 UTCEPSS rescore
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  14. 2026-08-08 20:55 UTCOSV refresh
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  27. 2026-07-24 14:17 UTCEPSS rescore
  28. 2026-07-23 19:41 UTCOSV refresh
  29. 2026-07-23 02:55 UTCEG score recompute
  30. 2026-07-22 14:07 UTCEPSS rescore
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  49. 2026-07-09 19:09 UTCEPSS rescore
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  52. 2026-07-06 16:27 UTCEPSS rescore
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  54. 2026-07-06 14:11 UTCOSV refresh
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Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2025-39833?
CVE-2025-39833 is a medium vulnerability published on September 16, 2025. In the Linux kernel, the following vulnerability has been resolved: mISDN: hfcpci: Fix warning when deleting uninitialized timer With CONFIGDEBUGOBJECTS_TIMERS unloading hfcpci module leads to the following splat: [ 250.215892] ODEBUG: assertinit not available (active state 0) object:…
When was CVE-2025-39833 disclosed?
CVE-2025-39833 was first published in the National Vulnerability Database on September 16, 2025, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-39833 actively exploited?
CVE-2025-39833 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 95.9% of all scored CVEs.
What is the CVSS score of CVE-2025-39833?
CVE-2025-39833 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2025-39833?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-39833, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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