{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-80973", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80973", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-11T19:42:35.751Z", "updatedAt": "2026-10-19T08:45:57.889Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ALSA: 6fire: bound the MIDI event length from the device", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: 6fire: bound the MIDI event length from the device\n\nusb6fire_comm_receiver_handler() forwards a MIDI event using a length\nbyte the device supplies, with no bound and no check that the transfer\ndelivered that many bytes:\n\n\tif (!urb->status) {\n\t\tif (rt->receiver_buffer[0] == 0x10) /* midi in event */\n\t\t\tif (midi_rt)\n\t\t\t\tmidi_rt->in_received(midi_rt,\n\t\t\t\t\t\trt->receiver_buffer + 2,\n\t\t\t\t\t\trt->receiver_buffer[1]);\n\t}\n\nreceiver_buffer is a 64-byte kzalloc() buffer (COMM_RECEIVER_BUFSIZE), so\nonly 62 bytes follow the two-byte header. receiver_buffer[1] is a u8 the\ndevice chooses, so a device that answers with 0x10 and a length of 0xFF\nmakes snd_rawmidi_receive() read 255 bytes starting two bytes into a\n64-byte object. The bytes past the buffer are handed to userspace\nthrough the rawmidi read path.\n\nurb->actual_length is not consulted either, so a short transfer leaves\nboth the type byte and the length byte at their previous values and the\nhandler acts on stale data.\n\nThe receiver URB is submitted from usb6fire_comm_init() at probe, so the\nread happens on plug with no user action; forwarding to userspace also\nneeds a MIDI input substream open, since usb6fire_midi_in_received()\nonly calls snd_rawmidi_receive() when rt->in is set.\n\nKASAN on 7.2.0-rc5 (arm64), single packet from an emulated device:\n\n BUG: KASAN: slab-out-of-bounds in snd_rawmidi_receive\n Read of size 255 at addr ffff000009f64682 by task bash/183\n __asan_memcpy\n snd_rawmidi_receive\n usb6fire_midi_in_received [snd_usb_6fire]\n usb6fire_comm_receiver_handler [snd_usb_6fire]\n Allocated by task 11:\n usb6fire_comm_init [snd_usb_6fire]\n usb6fire_chip_probe [snd_usb_6fire]\n The buggy address is located 2 bytes inside of\n allocated 64-byte region [ffff000009f64680, ffff000009f646c0)\n\nReject the event when the length exceeds the bytes that follow the\nheader, and require the transfer to have delivered the header plus that\nmany bytes. The receiver URB is submitted with a 64-byte\ntransfer_buffer_length, so a genuine device cannot deliver an event\nlonger than those 62 bytes and nothing valid is dropped.\n\nDiscovered by XBOW, triaged by Baul Lee ", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "c9204bc2ed2010e2469dbe5fce598878a37efd04" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "2c590d5e1b1595d5c8fa0b72d2897423ce9985ca" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "0c8a3c773823cf12abd39c480aed70e25c384630" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "00e84a9ff2d43953ae261995cae94d46f4c307a6" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "466e911bbbbb779bb06337e35a286e5ca7af16b3" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "34816e2cfeabafb8eccf54687186ce25699e8363" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "status": "affected", "versionType": "git", "lessThan": "a478893b59e36cfe7d77a76b352f2db55502e879" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.39", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.39" }, { "version": "5.10.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.221", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.109", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.50", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }