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High

Windows Common Log File System Driver Use-After-Free Elevation of Privilege

IdentifiersCVE-2026-32070CWE-416· Use After Free

CVE-2026-32070 is a local elevation-of-privilege vulnerability in the Windows Common Log File System (CLFS) Driver. The flaw is described as a use-after-free condition in the CLFS driver, where memory is accessed after it has been freed. An authorized local attacker can exploit this memory corruption issue to elevate privileges on the affected Windows system. The available advisory content identifies the issue specifically as a CLFS driver use-after-free leading to local privilege escalation, but does not provide vulnerable function-level details.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a local attacker with existing authorized access and low privileges to elevate to SYSTEM privileges. This results in full local compromise of the affected host, with high impact to confidentiality, integrity, and availability, and can materially aid post-compromise actions such as disabling defenses, credential theft, persistence, and lateral movement.

Mitigation

If you can’t patch tonight, do this now.

No specific vendor workaround or mitigation is provided in the available advisory content. In the absence of a patch, reduce exposure by limiting local access for untrusted users, minimizing the ability of low-privileged users to execute code on affected systems, and prioritizing rapid deployment of Microsoft's security update.

Remediation

Patch, then assume compromise.

Apply the official Microsoft security update for CVE-2026-32070 via the Microsoft Security Update Guide or standard Windows update channels. Prioritize patching because CLFS elevation-of-privilege flaws have historically been valuable for post-compromise and ransomware intrusion chains.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Microsoft CorporationWindowsoperating_system
Microsoft CorporationWindows 10 1607operating_system
Microsoft CorporationWindows 10 1809operating_system
Microsoft CorporationWindows 10 21h2operating_system
Microsoft CorporationWindows 10 22h2operating_system
Microsoft CorporationWindows 11 23h2operating_system
Microsoft CorporationWindows 11 24h2operating_system
Microsoft CorporationWindows 11 25h2operating_system
Microsoft CorporationWindows 11 26h1operating_system
Microsoft CorporationWindows 11 2h2operating_system
Microsoft CorporationWindows Server 2012operating_system
Microsoft CorporationWindows Server 2012 R2operating_system
Microsoft CorporationWindows Server 2016operating_system
Microsoft CorporationWindows Server 2019operating_system
Microsoft CorporationWindows Server 2022operating_system
Microsoft CorporationWindows Server 2022 23h2operating_system
Microsoft CorporationWindows Server 2025operating_system
Microsoft CorporationWindows Server 23h2operating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures1

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-32070
NVD
nvd.nist.gov/vuln/detail/CVE-2026-32070
MITRE CWE · CWE-416
Use After Free
Vendor Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32070