In appendFormatV of String8.cpp, there is a possible out of bounds write due to incorrect error handling. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-8.1 Android-9 Android-10 Android-11 Android-8.0Android ID: A-161894517

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-0421
• https://source.android.com/security/bulletin/2020-10-01