CVE-2021-4056: 
vulnerability analysis and mitigation

Type confusion in loader in Google Chrome prior to version 96.0.4664.93 was identified as CVE-2021-4056. The vulnerability was discovered on October 18, 2021, by @__R0ng of 360 Alpha Lab and was publicly disclosed in December 2021. This security flaw affected Google Chrome browsers and its derivatives, including Chromium-based browsers (Chrome Blog, NVD).

The vulnerability is classified as a type confusion flaw in the Chrome browser's loader component, which could potentially lead to heap corruption when exploited. The severity of this vulnerability is rated as HIGH with a CVSS v3.1 base score of 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). The vulnerability requires user interaction and can be exploited remotely through a crafted HTML page (NVD).

If successfully exploited, this vulnerability could allow a remote attacker to potentially exploit heap corruption through a specially crafted HTML page, potentially leading to arbitrary code execution within the context of the browser. The high CVSS score indicates significant potential impact on the confidentiality, integrity, and availability of the affected system (NVD).

Google released a patch in Chrome version 96.0.4664.93 to address this vulnerability. Users and organizations are advised to upgrade to this version or later. Various Linux distributions also released security updates, including Debian (version 97.0.4692.71-0.1~deb11u1), Fedora, and Gentoo (Debian Advisory, Fedora Update, Gentoo Advisory).