CVE-2021-35121 Use after free in Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

Medium 6.7 Published 14 Jun 2022 Updated 4 Aug 2024

A use-after-free vulnerability in the Synx driver allows attackers to execute arbitrary code or escalate privileges on Qualcomm Snapdragon devices.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2021-35121?

CVE-2021-35121 is a medium-severity use after free vulnerability in Qualcomm Apq8053 Firmware, published on 14 Jun 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An array index is improperly used to lock and unlock a mutex which can lead to a Use After Free condition In the Synx driver in Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

Weakness: CWE-129

Which versions are affected by CVE-2021-35121?

It affects 44 products.

Products include Qualcomm Apq8053 Firmware, Qualcomm Msm8953 Firmware, Qualcomm Qca6390 Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6426 Firmware, Qualcomm Qca6436 Firmware and 38 more.

How do I fix CVE-2021-35121?

Apply the vendor's patch.

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-2021-35121 being exploited?

There is no known exploitation of CVE-2021-35121 in the wild and no public exploit code.

All Qualcomm Apq8053 Firmware vulnerabilities

Sources

Also known as 3018966, A-209480901, GHSA-jj9r-hxfw-c62h, PUB-A-209480901.