EUVD-2026-44008
GHSA-764g-phpv-fv6g
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation from a low-privileged user with no interaction; kernel heap corruption yields full SYSTEM control, so PR:L, AV:L, and C/I/A all High.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Win32K (the kernel-mode GUI subsystem) lets an already-authenticated low-privilege user corrupt kernel heap memory via a heap-based buffer overflow (CWE-122) to gain SYSTEM-level control. The flaw affects a broad range of client and server builds (Windows 10 1607 through Windows 11 26H1, and Windows Server 2016 through 2025). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated code execution on the target host as at least a low-privileged user (CVSS PR:L, AV:L) - there is no remote or unauthenticated path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U, C:H/I:H/A:H) accurately frames this as a locally-exploitable, low-complexity, low-privilege escalation with full confidentiality, integrity, and availability impact on the affected host - a classic post-compromise escalation primitive rather than a remote entry point. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard user - for example through a phishing payload or a compromised low-privilege service account - runs a crafted program that issues malformed input to a vulnerable Win32K system call, overflowing a kernel heap allocation and grooming the pool to overwrite kernel structures. By converting the corruption into a kernel read/write primitive, the attacker escalates from the limited user context to SYSTEM, then installs persistence or disables endpoint defenses. … |
| Remediation | Apply the Microsoft security update for CVE-2026-54986 (Patch available per vendor advisory / Vendor-released patch via Microsoft) - install the relevant cumulative update for each affected SKU as listed in the MSRC guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54986; the exact per-version KB build number should be pulled from that advisory as it is not enumerated in the provided data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory your Windows environment to identify all systems running affected versions (Windows 10 build 1607 through current, Windows 11 all versions, Windows Server 2016 through 2025). …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
Leaving vuln.today