Detect Microsoft Windows Type Confusion Vulnerability (CVE-2026-21519) in CrowdStrike LogScale
Detects exploitation of CVE-2026-21519, a type confusion vulnerability (CWE-843) in Microsoft Windows. Type confusion vulnerabilities occur when code allocates or initializes a resource using one type but accesses it using an incompatible type, leading to out-of-bounds memory access, arbitrary code execution, or privilege escalation. This CVE is listed on the CISA Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
MITRE ATT&CK
LogScale Detection Query
#event_simpleName IN (ProcessRollup2, DriverLoad, ServiceInstall)
| eval process_name = FileName
| eval parent_name = ParentBaseFileName
| eval cmdline = CommandLine
| eval service_path = coalesce(ServiceImagePath, "")
| where (
(
#event_simpleName = "ProcessRollup2"
and parent_name IN ("lsass.exe", "winlogon.exe", "csrss.exe")
and not process_name IN ("conhost.exe", "WerFault.exe", "WerFaultSecure.exe")
)
or (
#event_simpleName = "ProcessRollup2"
and (cmdline = "*SeDebugPrivilege*" OR cmdline = "*SeImpersonatePrivilege*")
)
or (
#event_simpleName = "DriverLoad"
and not parent_name IN ("MsMpEng.exe", "services.exe", "wininit.exe", "TrustedInstaller.exe")
)
or (
#event_simpleName = "ServiceInstall"
and (service_path = "*\\AppData\\*" OR service_path = "*\\Temp\\*" OR service_path = "*.tmp*")
)
)
| eval risk_score = case(
#event_simpleName = "DriverLoad" and not parent_name IN ("services.exe", "MsMpEng.exe"), 90,
#event_simpleName = "ProcessRollup2" and parent_name IN ("lsass.exe", "winlogon.exe"), 85,
#event_simpleName = "ServiceInstall" and service_path = "*\\AppData\\*", 80,
true(), 60
)
| table timestamp, ComputerName, UserName, process_name, parent_name, cmdline, service_path, risk_score
| sort -risk_scoreCrowdStrike Falcon Query Language detection for CVE-2026-21519 type confusion exploitation indicators, covering abnormal process lineage from protected system processes, privilege token abuse, unauthorized driver loads, and service installation from suspicious paths.
Data Sources
Required Tables
False Positives & Tuning
- CrowdStrike sensor itself or other security products performing legitimate kernel-level operations
- Managed service providers using remote management tools that spawn from system processes
- Software defined infrastructure agents temporarily staging binaries in user-profile directories
- Penetration testing engagements using authorized exploit frameworks on in-scope systems
Other platforms for CVE-2026-21519
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Simulate Anomalous Child Process from Winlogon
Expected signal: Sysmon EventID 1 showing cmd.exe or similar process with an unexpected parent, Windows Security EventID 4688 capturing the new process creation with command line arguments.
- Test 2Privilege Token Enumeration via Command Line
Expected signal: Windows Security EventID 4688 with CommandLine containing privilege-related arguments, Sysmon EventID 1 capturing the full process creation with integrity level.
- Test 3Suspicious Service Installation from Temp Directory
Expected signal: Windows System EventID 7045 (new service installed) with ServiceImagePath pointing to %TEMP%, Sysmon EventID 13 capturing registry writes for the new service key under HKLM\SYSTEM\CurrentControlSet\Services.
- Test 4Unsigned Driver Load Simulation via Sysmon
Expected signal: Sysmon EventID 6 (DriverLoad) with the ImageLoaded path pointing to a non-standard location and the initiating process being a user-mode application rather than services.exe or wininit.exe.
Unlock Pro Content
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