CVE-2025-29824
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedUse after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceUse-after-free vulnerability in Windows Common Log File System Driver (CLFS.sys) allows a locally authenticated attacker to elevate privileges to SYSTEM level by exploiting a dangling pointer in kernel memory after the vulnerable object is freed.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 10.0.10240.20978< 10.0.14393.7969< 10.0.17763.7136< 10.0.19044.5737< 10.0.19045.5737< 10.0.22621.5189< 10.0.22631.5189< 10.0.26100.3775CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Windows versionRun 'winver' or 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' to get the exact Windows build numberAffected if The build number falls within any of the affected version ranges listed (e.g., < 10.0.10240.20978 for 1507, < 10.0.22621.5189 for Win11 22h2, etc.)
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Verify CLFS driver presenceCheck if clfs.sys exists at C:\Windows\System32\drivers\clfs.sysAffected if The CLFS driver file exists on the system (this is required for the vulnerability to apply)
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Check CLFS driver file versionRight-click clfs.sys, select Properties, then view the Details tab for the File version; alternatively, run 'powershell (Get-Item C:\Windows\System32\drivers\clfs.sys).VersionInfo'Affected if The driver version is lower than the patched versions for your Windows build (compare against the version thresholds for your specific Windows release)
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Check for suspicious processes with SYSTEM privilegesOpen Task Manager or run 'tasklist /V' and look for processes running as SYSTEM that were not launched by known legitimate services, especially processes with unusual names or from temp directoriesAffected if Unknown or suspicious processes are running as SYSTEM, which could indicate exploitation attempts
You are affected if your Windows build number is lower than the threshold for your version AND the clfs.sys driver is present on the system.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped10.0.10240.2097810.0.14393.796910.0.17763.7136
Apply the relevant Microsoft security patch for CVE-2025-29824 when released. Prioritize patching domain controllers and servers given the local privilege escalation risk.
Upgrade to Windows 10 build 10.0.10240.20978 (1507), 10.0.14393.7969 (1607), 10.0.17763.7136 (1809), 10.0.19044.5737 (21h2), 10.0.19045.5737 (22h2), or Windows 11 build 10.0.22621.5189 (22h2), 10.0.22631.5189 (23h2), 10.0.26100.3775 (24h2)
- Check current Windows version by running `winver` or `systeminfo` in Command Prompt
- Identify your specific Windows release (1507, 1607, 1809, 21h2, 22h2, 11 22h2, 11 23h2, or 11 24h2)
- Open Settings > Update & Security > Windows Update and check for updates
- Install all available security updates, or manually download the specific KB from the Microsoft Update Catalog for your version
- After installation, restart the system to apply the kernel driver update
- Verify the fix by running `winver` and confirming the build number matches or exceeds the fixed version for your release
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-29824 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-29824 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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