Windows CLFS Driver Elevation of Privilege
CVE-2024-38196 is a local privilege escalation vulnerability in the Windows Common Log File System (CLFS) driver, reported as affecting Windows 11 23H2. The flaw is described in the CLFS code path CClfsBaseFilePersisted::WriteMetadataBlock, which does not check the return value of ClfsDecodeBlock. According to the provided analysis, a crafted CLFS metadata block can cause ClfsDecodeBlock to return STATUS_LOG_BLOCK_INVALID while leaving the block encoded. Because sector-end tags remain in place, subsequent processing can corrupt adjacent CLFS metadata and internal structures. The write-up states an attacker can forge a CRC32 value of 0xffffffff to prevent proper decoding, manipulate the .blf metadata layout so CLFS client and container contexts overlap, and redirect a container pointer to a user-controlled fake CClfsContainer object. The exploit chain then uses the resulting kernel memory corruption to alter the current thread's PreviousMode and obtain arbitrary kernel read/write via NtReadVirtualMemory and NtWriteVirtualMemory, culminating in SYSTEM-level code execution.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local privilege escalation (LPE) vulnerability exploited by the Raspberry Robin malware to obtain elevated privileges on compromised Windows systems.
A Windows 11 Common Log File System (CLFS) local privilege escalation vulnerability caused by CClfsBaseFilePersisted::WriteMetadataBlock not checking the return value of ClfsDecodeBlock, enabling corruption of internal CLFS structures and kernel pool address leakage.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.