CVE-2024-26926

What it actually does

Missing offset alignment check in binder_get_object() after copy_from_user() replacement allows misaligned binder objects during transaction unwinding, risking data leakage or invalid memory handling in the kernel's binder driver.

Why it matters to the business

Vulnerable Linux kernels (including Android devices) face increased risk of system instability, crashes during IPC, or potential data exposure in inter-process communications, impacting device reliability and requiring urgent patching across fleets with many downstream dependents.

How an attack unfolds

An attacker sends a crafted binder transaction containing unaligned offsets; the removed check permits the malformed data to reach object unwinding logic, potentially leading to complications or leakage as originally mitigated by prior alignment enforcement.

How to fix it

Upgrade the Linux kernel to version 5.4.275 or apply commit 68a28f551e4690db2b27b3db716c7395f6fada12 in the stable tree; rebuild and deploy the fixed kernel image on all affected systems.

How to confirm the fix worked

Confirm the running kernel reports version 5.4.275 or newer; inspect binder_get_object() source for the restored offset alignment check before copy_from_user().

Typical attack path

1. Locate a target process communicating via Android/Linux binder IPC
2. Construct a transaction buffer with deliberately misaligned object offsets
3. Invoke the binder ioctl to submit the transaction
4. Force object processing and unwinding to trigger the flaw

How to detect it

Review kernel logs and binder driver traces for alignment-related errors or unexpected transaction failures; correlate with process IPC activity around the time of any anomalies.

What your security team should do

• Apply kernel updates immediately on production Android and Linux systems
• Rebuild custom kernels with the alignment fix if using downstream forks
• Monitor kernel logs for binder-related oops or panics during IPC testing