---
id: CVE-2025-39956
title: 'igc: don''t fail igc_probe() on LED setup error'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  igc: don't fail igc_probe() on LED setup error

  When igc_led_setup() fails, igc_probe() fails and triggers kernel panic
  in free_netdev() since unregister_netdev() is no…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ea578703b03d5d651b091c39f717dc829155b520 <
    bec504867acc7315de9cd96ef9161fa52a25abe8
  - >-
    Linux >= ea578703b03d5d651b091c39f717dc829155b520 <
    f05e82d8553232cef150a6dbb70ed67d162abb2b
  - >-
    Linux >= ea578703b03d5d651b091c39f717dc829155b520 <
    528eb4e19ec0df30d0c9ae4074ce945667dde919
  - Linux 6.9
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:55:00.586485Z'
published: '2025-10-09'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:02:33.822Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-39956'
references:
  - url: 'https://git.kernel.org/stable/c/bec504867acc7315de9cd96ef9161fa52a25abe8'
  - url: 'https://git.kernel.org/stable/c/f05e82d8553232cef150a6dbb70ed67d162abb2b'
  - url: 'https://git.kernel.org/stable/c/528eb4e19ec0df30d0c9ae4074ce945667dde919'
tags:
  - cve.org
epss: 0.00174
epssPercentile: 0.06957
ingestedAt: '2026-10-15T22:48:25.531Z'
---

## Overview

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

igc: don't fail igc_probe() on LED setup error

When igc_led_setup() fails, igc_probe() fails and triggers kernel panic
in free_netdev() since unregister_netdev() is not called. [1]
This behavior can be tested using fault-injection framework, especially
the failslab feature. [2]

Since LED support is not mandatory, treat LED setup failures as
non-fatal and continue probe with a warning message, consequently
avoiding the kernel panic.

[1]
 kernel BUG at net/core/dev.c:12047!
 Oops: invalid opcode: 0000 [#1] SMP NOPTI
 CPU: 0 UID: 0 PID: 937 Comm: repro-igc-led-e Not tainted 6.17.0-rc4-enjuk-tnguy-00865-gc4940196ab02 #64 PREEMPT(voluntary)
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
 RIP: 0010:free_netdev+0x278/0x2b0
 [...]
 Call Trace:
  <TASK>
  igc_probe+0x370/0x910
  local_pci_probe+0x3a/0x80
  pci_device_probe+0xd1/0x200
 [...]

[2]
 #!/bin/bash -ex

 FAILSLAB_PATH=/sys/kernel/debug/failslab/
 DEVICE=0000:00:05.0
 START_ADDR=$(grep " igc_led_setup" /proc/kallsyms \
         | awk '{printf("0x%s", $1)}')
 END_ADDR=$(printf "0x%x" $((START_ADDR + 0x100)))

 echo $START_ADDR > $FAILSLAB_PATH/require-start
 echo $END_ADDR > $FAILSLAB_PATH/require-end
 echo 1 > $FAILSLAB_PATH/times
 echo 100 > $FAILSLAB_PATH/probability
 echo N > $FAILSLAB_PATH/ignore-gfp-wait

 echo $DEVICE > /sys/bus/pci/drivers/igc/bind

## Affected

- `Linux >= ea578703b03d5d651b091c39f717dc829155b520 < bec504867acc7315de9cd96ef9161fa52a25abe8`
- `Linux >= ea578703b03d5d651b091c39f717dc829155b520 < f05e82d8553232cef150a6dbb70ed67d162abb2b`
- `Linux >= ea578703b03d5d651b091c39f717dc829155b520 < 528eb4e19ec0df30d0c9ae4074ce945667dde919`
- `Linux 6.9`

## Remediation

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