CVE-2014-7841

What it actually does

The flaw triggers a NULL pointer dereference in sctp_process_param during handling of malformed INIT chunks when ASCONF is enabled, causing an immediate kernel panic and system crash.

Why it matters to the business

Affected Linux systems suffer sudden crashes and loss of availability for any services using the SCTP protocol, leading to unplanned downtime and operational disruption.

How an attack unfolds

An attacker sends a single malformed SCTP INIT chunk containing invalid parameters over the network; the kernel's parameter processing path dereferences a NULL pointer and crashes the system. Public exploits exist for this issue.

How to fix it

Upgrade the Linux kernel to version 3.17.4 or later. If an upgrade is not immediately possible, disable the SCTP module or block SCTP traffic at network boundaries.

How to confirm the fix worked

Confirm the running kernel version is 3.17.4 or newer; test that malformed INIT chunks no longer cause crashes in a controlled environment.

Typical attack path

1. Scan for hosts accepting SCTP traffic on common ports
2. Craft a malformed INIT chunk with invalid ASCONF parameters
3. Transmit the packet to the target system
4. Trigger NULL dereference and kernel panic

How to detect it

Review kernel panic and oops logs for entries referencing sctp_process_param or sm_make_chunk; inspect network captures for unusual SCTP INIT chunks with ASCONF parameters.

What your security team should do

• Prioritize kernel upgrades on all internet-facing or SCTP-exposed systems
• Disable SCTP where the protocol is not required
• Add network filters to drop unexpected SCTP traffic
• Monitor kernel logs for SCTP-related oops or panic entries