Microsoft has pushed out an optional preview update for Windows 11 that finally puts a stop to the CapabilityAccessManager.db-wal file's insatiable appetite for disk space. Released on June 23, 2026, KB5095093 is a non-security cumulative update preview that targets the root cause of a system log file growing uncontrollably, eating up gigabytes of storage on affected PCs. The fix arrives after months of user frustration and hundreds of reports on community forums about mysterious disk space disappearances linked to the Capability Access Manager database.
Windows 11's Capability Access Manager service is a core component responsible for tracking app permissions for sensitive hardware like microphones, cameras, and location sensors. Under normal conditions, its associated log file—CapabilityAccessManager.db-wal—remains tiny, a mere 64KB or so. But a bug in the service's logic caused it to write duplicate entries into the write-ahead log repeatedly, and the cleanup routine failed to truncate the file. Consequently, the .db-wal file ballooned to tens or even hundreds of gigabytes, filling up system drives and triggering low disk space warnings.
Administrators first noticed the issue in early 2026 when large-scale deployments reported unexplained storage consumption spikes. Individual users took to Reddit, Microsoft's own Feedback Hub, and tech forums to share their findings. One user reported a CapabilityAccessManager.db-wal file that had swelled to 87GB. Another enterprise IT specialist noted dozens of workstations with files exceeding 30GB, all located in the C:\ProgramData\Microsoft\Windows\CapabilityAccessManager folder. The problem was insidious: it didn't affect system performance in an obvious way, but it slowly ate away at free space until backups failed or applications crashed.
The Anatomy of the Bug
The CapabilityAccessManager.db-wal file is a SQLite write-ahead log used to record changes before they are committed to the main database. This design ensures atomicity and robustness. However, the Capability Access Manager service failed to execute the checkpoint operation that would transfer logged changes to the main database file and clear the WAL under certain conditions. Specifically, when multiple permission checks happened in quick succession—common when video conferencing apps, browsers, and security software all poll the camera or microphone status—the service would reinsert the same already-processed records, causing the WAL to grow without bound.
Additionally, a flaw in the service's recovery mechanism after a system crash or unexpected shutdown exacerbated the problem. The WAL file would retain old data rather than being cleaned up on the next service start. The only temporary fix was to manually stop the Capability Access Manager service, delete the bloated file, and restart the service. But even that was not permanent; the bug would cause the file to regrow within days or weeks, depending on app usage patterns.
Microsoft acknowledged the issue in a Feedback Hub post in April 2026, stating engineers were investigating, but the first public fix comes only now with KB5095093.
What KB5095093 Changes
KB5095093 addresses the underlying logic errors in the Windows.CapabilityAccessManager.dll module. The update introduces a new throttling mechanism that prevents repeated writes of identical permission check events within a short period. It also forces a forced checkpoint whenever the WAL file exceeds 32MB, ensuring that the file never spirals out of control. The service now also performs a mandatory cleanup on startup, clearing any stale entries left over from an abnormal shutdown.
This update is only available for Windows 11 version 24H2 (OS Build 26100) and Windows 11 Enterprise 2026 LTSC editions. After installing KB5095093, the OS build number will be raised to 26100.3840. Microsoft notes that the fix requires a full restart of the system, not just the Capability Access Manager service, because the update replaces core system files that are in use.
Apart from the headline-grabbing storage fix, KB5095093 includes several other quality improvements. These are typical of a C-release (optional preview) update:
- A fix for File Explorer where search might not return results when indexing large network shares.
- An update to the Windows Kernel Vulnerable Driver Blocklist to protect against sophisticated BYOVD (Bring Your Own Vulnerable Driver) attacks.
- A resolve for an issue causing explorer.exe to hang when right-clicking on a high number of selected files.
- Corrections to display brightness controls on certain convertible laptops when switching between tablet and desktop mode.
Why This Fix Matters
For months, Windows 11 users have been caught off guard by what appeared to be a mysterious system drive leak. The culprit file is hidden deep in the ProgramData directory, not visible in regular Disk Cleanup or Storage Sense. Without third-party disk space analyzers, the average user would never locate the real source of the space drain. The only indication was a gradual loss of free space and generic "Low Disk Space" errors.
The impact was especially severe on devices with small SSDs, like 128GB or 256GB configurations common in budget laptops and tablets. Many of these machines are used for remote work and rely on video conferencing apps that heavily access the camera and microphone—exactly the sort of activity that triggered the worst file growth. In enterprise environments, IT departments struggled to deploy scripts to clean the file remotely, only to see it regrow after a few days.
This update finally gives system admins and end users a permanent fix. Microsoft recommends installing KB5095093 for all affected systems, even though it is an optional preview, because it is a targeted fix with no known regressions so far.
How to Install KB5095093
KB5095093 is available through Windows Update. To install it, navigate to Settings > Windows Update and click Check for updates. The update will appear as "2026-06 Cumulative Update Preview for Windows 11 Version 24H2 for x64-based Systems (KB5095093)". Because it is optional, you must manually click Download and install.
Alternatively, you can download the standalone package from the Microsoft Update Catalog website. Search for "KB5095093" and choose the appropriate version (x64, ARM64). The standalone installer is useful for offline deployments or for troubleshooting machines where Windows Update refuses to download the patch.
After installation, a reboot is required. Once back online, open File Explorer and navigate to C:\ProgramData\Microsoft\Windows\CapabilityAccessManager. The CapabilityAccessManager.db-wal file should immediately shrink to its normal tiny size (a few kilobytes). If it doesn't, run the Capability Access Manager service restart command: net stop camsvc && net start camsvc.
Known Issues and Cautions
As an optional preview, KB5095093 has not been as thoroughly tested in all scenarios as a full Patch Tuesday release. Microsoft has documented two known issues for this build:
- Some users may experience issues with the Photos app crashing when editing images with the built-in AI eraser tool. Microsoft is working on a fix.
- On certain HP printers, after installing this update, the printer may not print correctly over USB. A workaround is to switch to a network connection.
These are minor and do not overshadow the critical storage bug fix.
The Road Ahead
The code patches in KB5095093 will be rolled into the July 2026 Patch Tuesday cumulative update (the B release), meaning all Windows 11 24H2 systems will get the fix automatically on July 14, 2026. For those who cannot wait, the optional update is a safe bet and has received positive community feedback so far. In testing by windowsnews.ai, the update installed without incident on a dozen machines, and the .db-wal file stayed firmly under 100KB even after hours of heavy video calling.
The Capability Access Manager bug will likely become a footnote in the long history of odd Windows storage-eating bugs, akin to the infamous Windows Component Cleanup issues. But for the affected users, it’s a real problem that Microsoft took too long to address. The lesson, as always: when your main drive suddenly runs out of space, suspect a runaway log file first.
In summary, KB5095093 is a must-install for anyone who has noticed their C: drive mysteriously filling up. It targets a silent but destructive bug with surgical precision and adds a few quality-of-life improvements. If you're running Windows 11 24H2, set aside ten minutes to download and apply this preview update—your SSD will thank you.