MSRC_CVE-2026-45657
Vulnerability from csaf_microsoft - Published: 2026-06-09 07:00 - Updated: 2026-06-09 07:00Summary
Windows Kernel Remote Code Execution Vulnerability
Severity
Critical
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
9.8 (Critical)
Affected products
Fixed
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows Server 2022 10.0.20348.5256
Windows Server 2022
|
10.0.20348.5256 | ||
|
Windows Server 2022 (Server Core installation) 10.0.20348.5256
Windows Server 2022 (Server Core installation)
|
10.0.20348.5256 | ||
|
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7219
Windows 11 Version 23H2 for ARM64-based Systems
|
10.0.22631.7219 | ||
|
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.7219
Windows 11 Version 23H2 for x64-based Systems
|
10.0.22631.7219 | ||
|
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8655
Windows 11 Version 24H2 for ARM64-based Systems
|
10.0.26100.8655 | ||
|
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8655
Windows 11 Version 24H2 for x64-based Systems
|
10.0.26100.8655 | ||
|
Windows Server 2025 10.0.26100.32995
Windows Server 2025
|
10.0.26100.32995 | ||
|
Windows Server 2025 (Server Core installation) 10.0.26100.32995
Windows Server 2025 (Server Core installation)
|
10.0.26100.32995 | ||
|
Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8655
Windows 11 Version 25H2 for ARM64-based Systems
|
10.0.26200.8655 | ||
|
Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8655
Windows 11 Version 25H2 for x64-based Systems
|
10.0.26200.8655 | ||
|
Windows 11 version 26H1 for x64-based Systems 10.0.28000.2269
Windows 11 version 26H1 for x64-based Systems
|
10.0.28000.2269 | ||
|
Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.2269
Windows 11 Version 26H1 for ARM64-based Systems
|
10.0.28000.2269 |
Known affected
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Windows 11 Version 26H1 for ARM64-based Systems <10.0.28000.2269
Windows 11 Version 26H1 for ARM64-based Systems
|
<10.0.28000.2269 |
Vendor Fix
fix
|
|
|
Windows 11 version 26H1 for x64-based Systems <10.0.28000.2269
Windows 11 version 26H1 for x64-based Systems
|
<10.0.28000.2269 |
Vendor Fix
fix
|
|
|
Windows 11 Version 25H2 for x64-based Systems <10.0.26200.8655
Windows 11 Version 25H2 for x64-based Systems
|
<10.0.26200.8655 |
Vendor Fix
fix
|
|
|
Windows 11 Version 25H2 for ARM64-based Systems <10.0.26200.8655
Windows 11 Version 25H2 for ARM64-based Systems
|
<10.0.26200.8655 |
Vendor Fix
fix
|
|
|
Windows Server 2025 (Server Core installation) <10.0.26100.32995
Windows Server 2025 (Server Core installation)
|
<10.0.26100.32995 |
Vendor Fix
fix
|
|
|
Windows Server 2025 <10.0.26100.32995
Windows Server 2025
|
<10.0.26100.32995 |
Vendor Fix
fix
|
|
|
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.8655
Windows 11 Version 24H2 for x64-based Systems
|
<10.0.26100.8655 |
Vendor Fix
fix
|
|
|
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.8655
Windows 11 Version 24H2 for ARM64-based Systems
|
<10.0.26100.8655 |
Vendor Fix
fix
|
|
|
Windows 11 Version 23H2 for x64-based Systems <10.0.22631.7219
Windows 11 Version 23H2 for x64-based Systems
|
<10.0.22631.7219 |
Vendor Fix
fix
|
|
|
Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.7219
Windows 11 Version 23H2 for ARM64-based Systems
|
<10.0.22631.7219 |
Vendor Fix
fix
|
|
|
Windows Server 2022 (Server Core installation) <10.0.20348.5256
Windows Server 2022 (Server Core installation)
|
<10.0.20348.5256 |
Vendor Fix
fix
|
|
|
Windows Server 2022 <10.0.20348.5256
Windows Server 2022
|
<10.0.20348.5256 |
Vendor Fix
fix
|
Threats
Impact
Remote Code Execution
Exploit Status
Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
References
7 references
Acknowledgments
Microsoft
{
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"aggregate_severity": {
"namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
"text": "Critical"
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"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
},
{
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"text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
"title": "Customer Action"
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"name": "Microsoft Security Response Center",
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{
"category": "self",
"summary": "CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657"
},
{
"category": "self",
"summary": "CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45657.json"
},
{
"category": "external",
"summary": "Microsoft Exploitability Index",
"url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "Windows Kernel Remote Code Execution Vulnerability",
"tracking": {
"current_release_date": "2026-06-09T07:00:00.000Z",
"generator": {
"date": "2026-06-09T17:48:01.945Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-45657",
"initial_release_date": "2026-06-09T07:00:00.000Z",
"revision_history": [
{
"date": "2026-06-09T07:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
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"product_id": "5"
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"product_id": "10"
}
},
{
"category": "product_version",
"name": "10.0.22631.7219",
"product": {
"name": "Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7219",
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],
"category": "product_name",
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"product_id": "8"
}
},
{
"category": "product_version",
"name": "10.0.26100.8655",
"product": {
"name": "Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8655",
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{
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{
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},
"vulnerabilities": [
{
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"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"notes": [
{
"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
},
{
"category": "faq",
"text": "An attacker could exploit this vulnerability by sending specially crafted network traffic to a vulnerable Windows system. If successful, the malicious network packets could trigger a flaw in how the Windows kernel processes certain TCP/IP data, potentially allowing the attacker to run code with system-level privileges without needing to sign in or interact with a user.",
"title": "How could an attacker exploit the vulnerability?"
}
],
"product_status": {
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"11923",
"11924",
"12242",
"12243",
"12389",
"12390",
"12436",
"12437",
"20437",
"20438",
"20853",
"20854"
],
"known_affected": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability - HTML",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45657"
},
{
"category": "self",
"summary": "CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability - CSAF",
"url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45657.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.20348.5256:Security Update:https://support.microsoft.com/help/5094128",
"product_ids": [
"12",
"11"
],
"url": "https://support.microsoft.com/help/5094128"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
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"product_ids": [
"5",
"6"
],
"url": "https://support.microsoft.com/help/5094125"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.26200.8655:Security Update:https://support.microsoft.com/help/5094126",
"product_ids": [
"4",
"3"
],
"url": "https://support.microsoft.com/help/5094126"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.22631.7219:Security Update:https://support.microsoft.com/help/5093998",
"product_ids": [
"10",
"9"
],
"url": "https://support.microsoft.com/help/5093998"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.26100.8655:Security Update:https://support.microsoft.com/help/5094126",
"product_ids": [
"8",
"7"
],
"url": "https://support.microsoft.com/help/5094126"
},
{
"category": "vendor_fix",
"date": "2026-06-09T07:00:00.000Z",
"details": "10.0.28000.2269:Security Update:https://support.microsoft.com/help/5095051",
"product_ids": [
"2",
"1"
],
"url": "https://support.microsoft.com/help/5095051"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 8.5,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12"
]
}
],
"threats": [
{
"category": "impact",
"details": "Remote Code Execution"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
}
],
"title": "Windows Kernel Remote Code Execution Vulnerability"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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