Microsoft has confirmed a zero-day vulnerability in the Windows Kernel that attackers have already exploited to gain system privileges. Act now.
vulnerability in the Windows Kernel can enable an attacker to gain system privileges. Yes, a Windows kernel zero-day. Yes, attackers have already struck. Yes, you need to update now.that is Patch Tuesday has been released, and this time it contains no less than 63 vulnerabilities.
There’s one, though, that stands out: CVE-2025-62215, an actively exploited zero-day within the Windows Kernel itself. “While exploitation requires an attacker to win a race condition,” Satnam Narang, a senior staff research engineer at Tenable, said, “Microsoft confirmed that this vulnerability has been actively exploited in the wild.” Narang suggested that this was most likely, considering that CVE-2025-62215 is a privilege escalation flaw, “used as part of post-exploitation activity, following initial access via phishing, social engineering, or another vulnerability.”confirmed that “concurrent execution using shared resource with improper synchronization in Windows Kernel allows an authorized attacker to elevate privileges locally,” and that exploitation in the wild had been detected, others have gone further by way of digging into the Windows Kernel vulnerability.“It’s likely to affect just about every asset running Microsoft software,” Adam Barnett, lead software engineer at Rapid7, told me, adding that ”if all the stars align for the attacker, the prize could be remote code execution as system via the network without any need for an existing foothold.” The good news, aside from the fix being available, is that Barnett doesn’t think CVE-2025-60724 is wormable, but that doesn’t stop him from advising that it remains “a top priority for just about anyone considering how to approach this month’s patches.”: Double Free. The two conditions combined, Ben McCarthy, lead cyber security engineer at Immersive, warns, mean that “an attacker with low-privilege local access can run a specially crafted application that repeatedly attempts to trigger this race condition. The goal is to get multiple threads to interact with a shared kernel resource in an unsynchronised way, confusing the kernel's memory management and causing it to free the same memory block twice.” This then corrupts the kernel heap, the attacker overwrites memory, and the system execution flow is hijacked. Translation: you are in trouble, lots of it. As Jason Soroko, senior fellow at Sectigo, concluded, “CVE-2025-62215 does not open the door by itself, it flings it wide once an attacker is inside.”
Windows 10 Windows 11 Windows Server Windows Security Update Wiundows Zero Day Attack Patch Tuesday Microsoft Security Warning Windows Kernel CVE-2025-62215
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