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CVE-2025-37891 is a Linux kernel memory corruption vulnerability in the ALSA UMP handling path during conversion of MIDI 1.0 data to UMP packets for USB MIDI2 devices. The vulnerable conversion logic maintains an internal buffer sized for typical MIDI1 UMP packet data, but the implementation failed to account for SysEx handling, where the conversion routine can process up to 6 bytes. Because the internal buffer was only 4 bytes long, receipt of a longer SysEx message could overflow the buffer and corrupt adjacent kernel memory. The issue was introduced in Linux 6.5 and was fixed by increasing the buffer size to correctly accommodate SysEx UMP message data.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity Linux kernel USB subsystem vulnerability caused by improper length checks during USB MIDI1-to-UMP conversion for MIDI2-capable devices, leading to an arbitrary kernel heap overflow and potential local/root privilege escalation.
A high-severity Linux kernel USB subsystem vulnerability in the USB MIDI2 handling path caused by improper length checks during MIDI1-to-UMP conversion, leading to an arbitrary kernel heap overflow and enabling local/root privilege escalation via a malicious simulated USB device.
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.