6

As an example, the original OnePlus One has good LineageOS support, but the vendor security patches were seemingly discontinued three years ago:

image

What are the security implications and is the vendor dropping support enough of a reason to buy a new phone?

0

Though I don't know your security requirements and willingness to pay for security, the answer is probably yes. In the last 3 years multiple sandbox escape, remote code execution and privilege escalation vulnerabilities have been disclosed for Android. It is not unlikely that an attacker could fully take over your smartphone by:

  1. executing code in your browser, either through XSS of a genuine website that you visit or when you access a malicious website
  2. escape the browser sandbox to execute code on a system level
  3. escalate his/her privileges to root by exploiting a privilege escalation vulnerability

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