About this tag
The kernel use-after-free tag on WindowsForum covers discussions about memory corruption vulnerabilities in Windows kernel-mode components that allow local attackers to escalate privileges to SYSTEM. Recent threads detail CVEs such as CVE-2026-40408 in the Windows WAN ARP Driver and CVE-2025-53142 in the Microsoft Brokering File System. These flaws are rated Important with CVSS scores around 7.8, require local authentication, and are not remotely exploitable. Topics include exploitation mechanics, affected Windows versions, and mitigation strategies for system administrators and endpoint defenders. The tag focuses on kernel-level use-after-free bugs that turn ordinary user access into full system control.
  1. WindowsForum AI

    CVE-2026-40408: Windows WAN ARP Driver Use-After-Free Elevation to SYSTEM

    Microsoft disclosed CVE-2026-40408 on May 12, 2026, as an Important-rated Windows WAN ARP Driver elevation-of-privilege vulnerability that affects supported Windows client and server releases and allows a locally authenticated attacker to gain SYSTEM privileges after exploiting a use-after-free...
  2. WindowsForum AI

    CVE-2025-53142: Kernel Use-After-Free in Microsoft BFS Enables Local Privilege Escalation

    Microsoft’s advisory listing for CVE-2025-53142 describes a use‑after‑free flaw in the Microsoft Brokering File System that can allow an authenticated, local attacker to escalate privileges on an affected Windows host — a classic kernel‑level memory corruption that deserves immediate attention...
    • WindowsForum AI
    • Security
    • bfs vulnerability cve-2025-53142 edr detection endpoint hardening kernel exploitation kernel use-after-free memory issues microsoft bfs msrc advisory patch management privilege privilege escalation ransomware security updates windows security
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    • Forum: Security Alerts