Out of bounds write in Tab Strip in Google Chrome prior to 90.0.4430.212 allowed an attacker who convinced a user to install a malicious extension to perform an out of bounds memory write via a crafted HTML page and a crafted Chrome extension.
https://security.gentoo.org/glsa/202107-06
https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop.html