EUVD-2026-73349
GHSA-jhhp-3qf2-fp2f
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only kernel driver flaw requiring low-privileged user and high-complexity heap manipulation; full C/I/A reflects SYSTEM-level privilege escalation with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Partition Management Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Partition Management Driver (partmgr.sys) enables a low-privileged local attacker to escalate privileges to SYSTEM or kernel level across virtually all supported Windows client and server releases. Exploitation requires existing low-privileged code execution on the target and high attack complexity, consistent with a race condition or precise heap-grooming technique. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold low-privileged code execution on the local Windows system (PR:L) - for example, a standard domain or local user account with interactive logon access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score appropriately reflects a meaningful but non-trivially exploitable privilege escalation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's vendor-released patches targeting the minimum fixed builds for each affected release: Windows 10 22H2 → 10.0.19045.7725; Windows 10 21H2 → 10.0.19044.7725; Windows 10 1809 / Server 2019 → 10.0.17763.9245; Windows 10 1607 / Server 2016 → 10.0.14393.9512; Windows 11 23H2 → 10.0.22631.7582; Windows 11 24H2 / Server 2025 → 10.0.26100.9445 (client) / 10.0.26100.33438 (server); Windows 11 25H2 → 10.0.26200.9445; Windows 11 26H1 → 10.0.28000.2954; Windows Server 2022 → 10.0.20348.5622; Windows Server 2012 R2 → 6.3.9600.23397; Windows Server 2012 → 6.2.9200.26349. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems (clients and servers, all supported versions) and verify Microsoft patch availability for your specific builds. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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