A use-after-free vulnerability exists in the way certain events are processed for ImageLoader objects of WebKit. A specially crafted web page can lead to a potential information leak and further memory corruption. In order to trigger the vulnerability, a victim must be tricked into visiting a malicious webpage.
Upstream advisory: https://webkitgtk.org/security/WSA-2021-0004.html
Talos advisory with more details: https://talosintelligence.com/vulnerability_reports/TALOS-2021-1229
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:4381 https://access.redhat.com/errata/RHSA-2021:4381
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-21775