CVE-2025-39956

/// Technical description

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=/

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References