Kernel memory disclosure via unbounded MIDI length
Published Sep 11, 2026 · Updated Sep 11, 2026
Out-of-bounds read in the Linux 6fire USB audio driver allows physically proximate attackers to read kernel memory through MIDI input. usb6fire_comm_receiver_handler passes a device-controlled length to snd_rawmidi_receive without bounding it to the 64-byte buffer or the URB's actual length. A crafted or emulated USB device triggers the read during probing without user interaction, but disclosure through raw MIDI requires an open MIDI input substream.
Summary
What happened
Out-of-bounds read in the Linux 6fire USB audio driver allows physically proximate attackers to read kernel memory through MIDI input. usb6fire_comm_receiver_handler passes a device-controlled length to snd_rawmidi_receive without bounding it to the 64-byte buffer or the URB's actual length. A crafted or emulated USB device triggers the read during probing without user interaction, but disclosure through raw MIDI requires an open MIDI input substream.
The record
- CVE
- CVE-2026-80973
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1200
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.6.39
- Affected versionversion=c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5
- Affected versionversion=c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <34816e2cfeabafb8eccf54687186ce25699e8363
- Affected versionversion=c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <466e911bbbbb779bb06337e35a286e5ca7af16b3
- Affected versionversion=c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 <a478893b59e36cfe7d77a76b352f2db55502e879
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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