CVE-2023-53782

What it actually does

Out-of-bounds memory access in DCCP error handlers when sequence numbers beyond the first 8 bytes of the header are read without an explicit pskb_may_pull() call.

Why it matters to the business

Potential kernel-level memory corruption on affected Linux systems can lead to crashes, denial of service, or privilege escalation; low exploitability reduces immediate risk but still requires patching on Ubuntu deployments using the listed packages.

How an attack unfolds

An attacker sends specially crafted DCCP packets that trigger the error handler path, causing the kernel to access memory beyond the initially pulled header bytes and potentially corrupt adjacent structures.

How to fix it

Upgrade webkit2gtk on Ubuntu 16.04 LTS to version 2.20.1-0ubuntu0.16.04.1 and on Ubuntu 18.04 LTS to version 2.20.0-2; apply kernel updates that include the DCCP error handler fix when available.

How to confirm the fix worked

Confirm package versions match the fixed releases listed above and verify the presence of the pskb_may_pull() call in the DCCP error handling code paths.

Typical attack path

1. Craft and transmit malicious DCCP packets targeting the error handler
2. Trigger out-of-bounds read of sequence number data
3. Leverage memory corruption for denial of service or code execution

How to detect it

Inspect kernel logs for DCCP-related oops or panic messages and review network packet captures for anomalous DCCP error packets; no public exploitation artifacts are known.

What your security team should do

• Prioritize patching Ubuntu systems running the affected webkit2gtk packages within standard maintenance windows
• Monitor EPSS and KEV status for any future rise in exploit activity
• Review network configurations to limit exposure to DCCP traffic if feasible