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CVE-2026-45657 is a critical remote code execution vulnerability in the Windows Kernel caused by a use-after-free condition. Available reporting indicates the flaw is in how the kernel handles TCP/IP operations or network traffic processing, where specially crafted network packets can trigger dereference of freed memory, consistent with a dangling-pointer/race-condition style UAF. Successful exploitation allows arbitrary code execution in kernel context, resulting in SYSTEM-level execution. Multiple sources characterize the issue as remotely reachable, unauthenticated, requiring no user interaction, and potentially wormable under certain network configurations.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
37 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Критическая RCE-уязвимость в ядре Windows, связанная с use-after-free и допускающая удаленное выполнение кода через специально сформированный сетевой трафик.
Windows Kernel remote code execution vulnerability with a high CVSS score of 9.8.
A critical use-after-free remote code execution vulnerability in Windows Kernel that can be triggered via specially crafted network traffic and may allow SYSTEM-level code execution without authentication or user interaction.
A critical use-after-free vulnerability in core Windows components that can be exploited over the network against x64 and ARM64 systems running Windows 11 and Windows Server 2022/2025.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.