Report: Some Android phones are given credit for security patch updates they never received20
SRL checked out the firmware on 1,200 Android handsets and looked for every patch disseminated in 2017. The results were interesting. Outside of the Google Pixel and Google Pixel 2, the tests revealed that even high-end flagship models made by the top manufacturers had Android security patch updates skipped over, even if the update was credited on the phone. By showing users that these patches were installed when they weren't, owners believe that their handsets are safer than they really are.
SRL founder Karsten Nohl says that in some cases, a manufacturer might accidentally miss a security patch update, or even two. But the Samsung J3 (2016) claimed to have every 2017 Android patch installed when in truth it had missed 12 updates, including a pair that were considered "critical" to keeping the handset safe and secure.
Besides manufacturers, SRL said some chip makers are to blame. In particular, phones powered by a MediaTek chipset had 9.7 missed patches on average. That could be due to the fact that some cheaper phones using less expensive chips are more likely to miss updates. SRL founder Nohl says, "The lesson is that if you go for a cheaper device, you end up in a less well maintained part to this ecosystem."
Google says that some of the devices in the study may not have been Android certified devices, which means that Google's standards of security would not apply to them. And some patches may have been missed, says Google, because the manufacturer removed the offending feature instead of fixing it with the patch. Google is working with SRL to delve deeper into its test results.