Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local access with low-privilege account required; no scope change, integrity, or availability impact; only kernel memory disclosure confirmed by description and CVSS.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionNVD
Integer underflow (wrap or wraparound) in Windows Kernel allows an authorized attacker to disclose information locally.
AnalysisAI
Integer underflow in the Windows Kernel enables a locally authenticated attacker to disclose sensitive kernel memory contents across a broad range of Windows 10, Windows 11, and Windows Server platforms. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms that any low-privilege local user can trigger the flaw without special configuration or user interaction, yielding high confidentiality impact with no integrity or availability consequences. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a locally authenticated user account with at minimum low-privilege access on the target system (PR:L per CVSS vector AV:L/AC:L/PR:L/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 5.5 (Medium) accurately reflects the limited attack surface: the vulnerability is local-only (AV:L), requires only a low-privilege account (PR:L), and has no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user logged into an unpatched Windows system executes a crafted application or script that issues a specific kernel call, triggering the integer underflow in the vulnerable kernel code path. The arithmetic wraparound causes the kernel to copy memory from an unintended address into a user-accessible buffer, leaking kernel pointers or security token values. … |
| Remediation | Apply the vendor-released patch by deploying the July 2026 Microsoft Security Update via Windows Update, WSUS, or the Microsoft Update Catalog as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50300. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-191 – Integer Underflow
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43845
GHSA-c6qf-23gr-mjqw