DISM /ScanHealth leaks WinSxS\Temp\InFlight data on Windows 11 25H2 Build 26200.9457

Proposed workaround as powershell script to clean cache until this issue is fixed,

# =========================================================================
# CHECK CBS/TrustedInstaller IS IDLE, THEN TAKE OWNERSHIP AND CLEAR InFlight
# Run this AFTER a reboot, once you've confirmed cache growth (>500MB) persists
# =========================================================================
# --- 1. Confirm TrustedInstaller service is stopped ---
$tiService = Get-Service TrustedInstaller
Write-Host "TrustedInstaller service status: $($tiService.Status)" -ForegroundColor Cyan
if ($tiService.Status -ne 'Stopped') {
    Write-Host "TrustedInstaller is still running. Waiting 2 minutes and rechecking..." -ForegroundColor Yellow
    Start-Sleep -Seconds 120
    $tiService = Get-Service TrustedInstaller
    Write-Host "Rechecked status: $($tiService.Status)" -ForegroundColor Cyan
}
# --- 2. Confirm no TiWorker process is active ---
$tiWorker = Get-Process TiWorker -ErrorAction SilentlyContinue
if ($tiWorker) {
    Write-Host "TiWorker is still running (PID $($tiWorker.Id), StartTime $($tiWorker.StartTime)). Not safe to proceed." -ForegroundColor Red
    return
} else {
    Write-Host "TiWorker not running. Confirmed idle." -ForegroundColor Green
}
# --- 3. Only proceed if TrustedInstaller is stopped ---
if ($tiService.Status -eq 'Stopped') {
    Write-Host "`nSystem is idle. Proceeding with InFlight cleanup." -ForegroundColor Cyan
    # Take ownership of InFlight and everything inside it
    takeown /F "C:\Windows\WinSxS\Temp\InFlight" /R /D Y
    # Grant Administrators full control
    icacls "C:\Windows\WinSxS\Temp\InFlight" /grant Administrators:F /T /C
    # Delete contents (folder itself remains, only contents removed)
    Get-ChildItem "C:\Windows\WinSxS\Temp\InFlight" -Force | Remove-Item -Recurse -Force -ErrorAction Stop
    # Verify
    $remaining = Get-ChildItem "C:\Windows\WinSxS\Temp\InFlight" -Recurse -Force -ErrorAction SilentlyContinue |
        Measure-Object -Property Length -Sum
    Write-Host "`nRemaining size in InFlight: $([math]::Round($remaining.Sum / 1MB, 2)) MB" -ForegroundColor Green
    # Confirm system health afterward
    Write-Host "`nRunning SFC to confirm nothing was disturbed..." -ForegroundColor Cyan
    sfc /scannow
} else {
    Write-Host "`nTrustedInstaller still not stopped after wait. Aborting - do not proceed manually until it's idle." -ForegroundColor Red
}

Hi David,

Please make sure to file this

issue in the Feedback Hub so

the Engineering team gets the data.