Microsoft Patches CVE-2026-50458 Use-After-Free Flaw in Windows bfs.sys Driver

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Microsoft has addressed CVE-2026-50458, a use-after-free vulnerability in the Windows Brokering File System kernel driver (bfs.sys), as part of its latest Patch Tuesday update. The flaw stems from the driver's failure to invalidate memory pointers after deallocation, leaving dangling pointers that attackers can manipulate. By crafting specific file system operations, a malicious actor could exploit these pointers to execute arbitrary code, escalate privileges, or destabilize affected systems. The vulnerability is attributed to inadequate memory management practices and insufficient code review during driver development. Left unpatched, it posed a serious risk to the integrity and security of Windows devices worldwide.

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