{"api_version":"1","generated_at":"2026-09-14T03:10:48+00:00","cve":"CVE-2026-80973","urls":{"html":"https://cve.report/CVE-2026-80973","api":"https://cve.report/api/cve/CVE-2026-80973.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80973","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80973"},"summary":{"title":"ALSA: 6fire: bound the MIDI event length from the device","description":"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 <baul.lee@xbow.com>","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:03","updated_at":"2026-09-11 20:19:03"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/466e911bbbbb779bb06337e35a286e5ca7af16b3","name":"https://git.kernel.org/stable/c/466e911bbbbb779bb06337e35a286e5ca7af16b3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a478893b59e36cfe7d77a76b352f2db55502e879","name":"https://git.kernel.org/stable/c/a478893b59e36cfe7d77a76b352f2db55502e879","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5","name":"https://git.kernel.org/stable/c/2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/34816e2cfeabafb8eccf54687186ce25699e8363","name":"https://git.kernel.org/stable/c/34816e2cfeabafb8eccf54687186ce25699e8363","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80973","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80973","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 466e911bbbbb779bb06337e35a286e5ca7af16b3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 34816e2cfeabafb8eccf54687186ce25699e8363 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 a478893b59e36cfe7d77a76b352f2db55502e879 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.39","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.39 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80973","cve":"CVE-2026-80973","epss":"0.002000000","percentile":"0.099340000","score_date":"2026-09-13","updated_at":"2026-09-14 00:18:03"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["sound/usb/6fire/comm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"466e911bbbbb779bb06337e35a286e5ca7af16b3","status":"affected","version":"c6d43ba816d1cf1d125bfbfc938f2a28a87facf9","versionType":"git"},{"lessThan":"2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5","status":"affected","version":"c6d43ba816d1cf1d125bfbfc938f2a28a87facf9","versionType":"git"},{"lessThan":"34816e2cfeabafb8eccf54687186ce25699e8363","status":"affected","version":"c6d43ba816d1cf1d125bfbfc938f2a28a87facf9","versionType":"git"},{"lessThan":"a478893b59e36cfe7d77a76b352f2db55502e879","status":"affected","version":"c6d43ba816d1cf1d125bfbfc938f2a28a87facf9","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["sound/usb/6fire/comm.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.39"},{"lessThan":"2.6.39","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"2.6.39","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"2.6.39","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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 <baul.lee@xbow.com>"}],"providerMetadata":{"dateUpdated":"2026-09-11T19:42:35.751Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/466e911bbbbb779bb06337e35a286e5ca7af16b3"},{"url":"https://git.kernel.org/stable/c/2a6f6fba3bd31d2e8c957fefa29156e35e5e75d5"},{"url":"https://git.kernel.org/stable/c/34816e2cfeabafb8eccf54687186ce25699e8363"},{"url":"https://git.kernel.org/stable/c/a478893b59e36cfe7d77a76b352f2db55502e879"}],"title":"ALSA: 6fire: bound the MIDI event length from the device","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80973","datePublished":"2026-09-11T19:42:35.751Z","dateReserved":"2026-08-26T14:34:25.810Z","dateUpdated":"2026-09-11T19:42:35.751Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:03","lastModifiedDate":"2026-09-11 20:19:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80973","Ordinal":"1","Title":"ALSA: 6fire: bound the MIDI event length from the device","CVE":"CVE-2026-80973","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80973","Ordinal":"1","NoteData":"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 <baul.lee@xbow.com>","Type":"Description","Title":"ALSA: 6fire: bound the MIDI event length from the device"}]}}}