cve-2026-45657

CVE-2026-45657 is a critical Windows Kernel remote code execution vulnerability disclosed by Microsoft on June 9, 2026, as part of the June security updates. It affects supported Windows 11 and Windows Server releases with a CVSS base score of 9.8. While Microsoft assesses exploitation as less likely and not currently known to be public or active, the vulnerability's network-reachable kernel nature demands priority attention from administrators. Patches are available through the June security updates, and the advisory emphasizes that this is not a routine Patch Tuesday item. The tag covers discussion of the vulnerability's impact, mitigation steps, and guidance for prioritizing the update in enterprise environments.