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kernel privilege escalation

About this tag
The kernel privilege escalation tag on WindowsForum.com covers Windows kernel-mode driver vulnerabilities that allow local attackers to elevate privileges. Recent discussions include CVE-2026-40369 in a kernel-mode driver, CVE-2026-32070 in the Common Log File System (CLFS) driver, CVE-2026-26176 in the Client Side Caching driver (csc.sys), CVE-2026-26173 in the Ancillary Function Driver for WinSock (AFD.sys), and CVE-2025-30388 in the Win32K subsystem. These threads analyze CVSS scores, Microsoft's confidence metrics, patch urgency, and mitigation strategies. The content emphasizes that while these bugs are not remote-code-execution emergencies, they are dangerous after an attacker gains a foothold, making them a priority for administrators.
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    CVE-2026-40369 May Patch Tuesday: Windows Kernel Driver EoP Risk (CVSS 7.8)

    Microsoft published CVE-2026-40369 on May 12, 2026 as part of its May Patch Tuesday release, identifying it as a Windows kernel-mode driver vulnerability rated Important with a CVSS base score of 7.8. The flaw is not, on the public evidence available today, a panic-grade Windows emergency. But...
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    • cve-2026-40369 kernel privilege escalation patch tuesday windows security
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    • Forum: Security Alerts
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    CVE-2026-32070: CLFS Elevation of Privilege & Microsoft’s HMAC Log Hardening

    Microsoft’s CVE-2026-32070 shines a fresh spotlight on one of Windows’ most security-sensitive kernel components: the Common Log File System (CLFS) driver. The vulnerability is classified as an elevation of privilege issue, which means a successful exploit could let a local attacker move from...
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    • clfs driver hmac file authentication kernel privilege escalation windows security
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-26176 Windows csc.sys Privilege Escalation: Patch and Mitigate Fast

    Overview Microsoft’s CVE-2026-26176 is a Windows Client Side Caching driver vulnerability in csc.sys that can let a local attacker elevate privileges. In practical terms, that puts it in the same broad class as many of the most operationally relevant Windows security bugs: it does not require a...
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    • csc.sys cve-2026-26176 kernel privilege escalation windows security
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-26173 AFD.sys: Microsoft Confidence Metric and Patch Urgency

    Understanding CVE-2026-26173 and Microsoft’s AFD.sys Confidence Metric Microsoft’s CVE-2026-26173 entry points to a familiar but still dangerous Windows pattern: a kernel-adjacent privilege-escalation issue in the Ancillary Function Driver for WinSock (AFD.sys), the long-lived networking...
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    • afd.sys kernel privilege escalation patch management windows cve
    • Replies: 0
    • Forum: Security Alerts
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    Understanding CVE-2025-30388: Windows Win32K Heap Overflow & Security Implications

    A sophisticated memory safety flaw has recently come to light in the Windows ecosystem, specifically within the heart of its graphical subsystem. Security researchers, industry analysts, and Microsoft itself have issued advisories regarding CVE-2025-30388, a heap-based buffer overflow that...
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    • buffer overflow cve-2025-30388 graphics subsystem vulnerabilities graphics-security heap overflow kernel code modernization kernel privilege escalation kernel vulnerability memory management memory safety os security patch management privilege escalation security research security updates system risk vulnerability disclosure win32k vulnerability windows security
    • Replies: 0
    • Forum: Security Alerts
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