CVE-2023-2136

An integer overflow (CWE-190) in Skia, the 2D graphics library used by Chrome's renderer, can be triggered by a crafted HTML page whose content drives Skia processing past the limits of its integer math. A remote attacker who has already compromised the Chrome renderer process — for example through a separate renderer flaw or a malicious page — can leverage the overflow to escape Chrome's renderer sandbox and gain broader code execution on the host. All Google Chrome and Chromium users running versions prior to 112.0.5615.137 are affected, including Chromium packages shipped by Debian and Fedora. The flaw is rated Critical (CVSS 3.1: 9.6) and carries Chromium security severity High, with an EPSS probability of 5.7% (93rd percentile) of exploitation within 30 days. It was added to CISA's Known Exploited Vulnerability catalog on 2023-04-21, and news reports describe it as an actively exploited Chrome zero-day for which Google rushed out the 112.0.5615.137 patch.

What to do: Update Google Chrome to 112.0.5615.137 or later on all platforms, and install the corresponding Chromium security updates on Debian and Fedora systems. Because exploitation requires user interaction with a crafted page plus a pre-existing renderer compromise, prompt patching is the primary mitigation; verify via CISA KEV required actions that all managed browsers are updated and confirm Chrome versions in endpoint inventory.