CVE-2018-9439 Use after free in Android

What is CVE-2018-9439?

CVE-2018-9439 is a high-severity use after free vulnerability in Google Android, published on 4 Dec 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In __unregister_prot_hook and packet_release of af_packet.c, there is a possible use-after-free due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.

Weakness: CWE-416

Which versions are affected by CVE-2018-9439?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2018-9439?

No fix has been published for CVE-2018-9439 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-9439 being exploited?

There is no known exploitation of CVE-2018-9439 in the wild and no public exploit code.

Other vulnerabilities in Google Android

• CVE-2026-58704 Google Pixel Improper Authorization Exploited High 8.8
• CVE-2025-48543 Android Runtime Use-After-Free Exploited High 8.8
• CVE-2023-35674 Android Framework Privilege Escalation Exploited High 8.8
• CVE-2025-48595 Android Framework Integer Overflow Exploited High 8.4
• CVE-2024-32896 Android Pixel Privilege Escalation Exploited High 8.1

All Google Android vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-ccc5-2pmp-ch3g.