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CVE-2025-39993 is a use-after-free vulnerability in the Linux kernel iMON media remote-control driver. The disconnect handler releases USB device references without coordinating with active device users. In particular, interface USB-device pointers are not protected by the driver user counter and can be released while writer operations remain active. A concurrent writer can subsequently use a freed USB-device pointer while preparing or sending a packet. The fix introduces a synchronized disconnected state, protected by the driver lock, and causes affected writer and open paths to return -ENODEV once device disconnection has begun.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
24 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel media/rc race condition vulnerability involving imon_disconnect().
A Linux kernel media/rc race condition involving imon_disconnect().
A race-condition vulnerability in the Linux kernel media remote-control subsystem involving imon_disconnect().
A race-condition vulnerability in the Linux kernel media remote-control subsystem involving imon_disconnect().
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.