CVE-2025-29824 - PatchNow

📋 Vulnerability Details

Data Source: CIRCL

Confidence: HIGH

Exploitation Method: OTHER

CVE Published: 2025-04-08

Added to CISA KEV: 2025-04-08 0 DAY BETWEEN CVE AND KEV

🎯 Recommendations:

CRITICAL: Check for indicators of compromise - this vulnerability is in CISA KEV indicating active exploitation in the wild. Review logs, check for unauthorized access, verify system integrity
Apply Microsoft security updates immediately across all Windows systems
Monitor for unusual privilege escalation activities and unauthorized administrative access
Implement enhanced logging for privilege changes and system-level activities
Patch priority: HIGH - while not directly internet-exploitable, active exploitation makes this critical for preventing lateral movement and privilege escalation in compromised environments

🔍 Web Intelligence (Kagi · 2026-06-04)

CVE-2025-29824 is a high-severity use-after-free (UAF) vulnerability in the Microsoft Windows Common Log File System (CLFS) driver that allows an authorized attacker to escalate privileges to `SYSTEM` level?id=CVE-2025-29824?kagi_q=CVE-2025-29824 ^[1].

Exploitation and Threat Activity

Active Exploitation: The vulnerability was actively exploited in the wild as a zero-day prior to its disclosure and patching on April 8, 2025 ^[3].
Threat Actors: It has been linked to the threat actor Storm-2460, who utilized the "PipeMagic" malware to facilitate the exploitation ^[1].
Ransomware Campaigns: The vulnerability has been used in ransomware campaigns, specifically by actors associated with the Play ransomware family, who used it to breach organizations after gaining initial access through other vectors, such as public-facing Cisco ASA devices ^[2].

Attack Method and Requirements

Exploitation Type: Local Privilege Escalation (LPE).
Requirements: An attacker must already have authorized access to the system to trigger the vulnerability?id=CVE-2025-29824?kagi_q=CVE-2025-29824.
Technical Details: The vulnerability involves a race condition in the CLFS driver's handling of `W32PROCESS` structures. It can be triggered via `WaitForInputIdle`, which leads to a use-after-free condition, enabling the attacker to manipulate kernel memory and gain elevated privileges ^[1].

Impact and Availability

Impact: Successful exploitation grants the attacker `SYSTEM` privileges, providing full control over the compromised machine ^[1].
PoC Availability: Proof-of-concept (PoC) exploit code has been made publicly available, including repositories on platforms like GitHub ^[1].

Patch and Mitigation Status

Patch Status: Microsoft released security updates to address this vulnerability on April 8, 2025 ^[3].
Mitigation: Organizations are advised to ensure all Windows systems are fully patched. Microsoft also provided hunting rules to detect post-exploitation behavior associated with CLFS exploitation and subsequent ransomware activity ^[4].

Sources

GitHub - encrypter15/CVE-2025-29824
CVE-2025-29824 is a high-severity (CVSS 7.8) elevation of privilege vulnerability exploited in the wild by the Storm-2460 threat actor via PipeMagic malware. A race condition in the CLFS driver’s handling of W32PROCESS structures, triggered via WaitForInputIdle, causes a UAF, allowing kernel memory…
Play Ransomware Exploited Windows CVE-2025-29824 as Zero-Day to Breach ...
Threat actors with links to Play ransomware family used a privilege escalation flaw in Windows CLFS driver to breach a U.S. organization. The attack involved a bespoke information stealer and a public-facing Cisco ASA as an entry point.
Exploitation of CLFS zero-day leads to ransomware activity - Microsoft
Microsoft Threat Intelligence Center (MSTIC) and Microsoft Security Response Center (MSRC) have discovered post-compromise exploitation of a ... Microsoft Threat Intelligence Center (MSTIC) and Microsoft Security Response Center (MSRC) have discovered post-compromise exploitation of a newly discover…
CVE-2025-29824 Information : r/crowdstrike - Reddit
MSFT has some fairly (read: very) broad hunting rules on their site looking for post-exploitation behavior of CLFS exploitation and rasomware execution.

🟢 CVE-2025-29824