{"id":"CVE-2026-80829","title":"ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()\n\nsnd_usbmidi_novation_output() lays out a two-byte header at\ntransfer_buffer[0..1] and passes &transfer_…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 558fc4485ecc704edfe7876d6cebae4738ff7ef8","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9c8212436631b0063cb021e9f58df438e3db84d0","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e9c00d7533f99aa9833c4b598f47e3b3202fdb9a","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 94e4562fcc81badd1d467ddfb88c27e4fae974c2","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7f00dbddb51f4f74325cdc7c3f6b19fb3392481a","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1074c2306901b44ebcb83855583c6776e1e392ea","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1035a8f63bae28e498b0e7b5ac91d749844a7158","Linux 2.6.12"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:44:21.713Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80829","references":[{"url":"https://git.kernel.org/stable/c/558fc4485ecc704edfe7876d6cebae4738ff7ef8"},{"url":"https://git.kernel.org/stable/c/9c8212436631b0063cb021e9f58df438e3db84d0"},{"url":"https://git.kernel.org/stable/c/e9c00d7533f99aa9833c4b598f47e3b3202fdb9a"},{"url":"https://git.kernel.org/stable/c/94e4562fcc81badd1d467ddfb88c27e4fae974c2"},{"url":"https://git.kernel.org/stable/c/7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870"},{"url":"https://git.kernel.org/stable/c/91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c"},{"url":"https://git.kernel.org/stable/c/7f00dbddb51f4f74325cdc7c3f6b19fb3392481a"},{"url":"https://git.kernel.org/stable/c/1074c2306901b44ebcb83855583c6776e1e392ea"},{"url":"https://git.kernel.org/stable/c/1035a8f63bae28e498b0e7b5ac91d749844a7158"}],"tags":["cve.org"],"epss":0.00195,"epssPercentile":0.08589,"ingestedAt":"2026-10-19T09:16:01.502Z","slug":"CVE-2026-80829","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()\n\nsnd_usbmidi_novation_output() lays out a two-byte header at\ntransfer_buffer[0..1] and passes &transfer_buffer[2] together with a\nlength of ep->max_transfer - 2 to snd_rawmidi_transmit():\n\n\tcount = snd_rawmidi_transmit(ep->ports[0].substream,\n\t\t\t\t     &transfer_buffer[2],\n\t\t\t\t     ep->max_transfer - 2);\n\nep->max_transfer comes from the output endpoint's wMaxPacketSize via\nusb_maxpacket(). A malformed or malicious device can advertise a bulk\nOUT endpoint with a wMaxPacketSize of 1 - the USB core only clamps this\nvalue downwards - so ep->max_transfer becomes 1 and the count argument\nbecomes -1.\n\nsnd_rawmidi_transmit() passes the negative count on to\n__snd_rawmidi_transmit_peek(), where \"if (count1 > count) count1 = count\"\nleaves count1 negative; get_aligned_size() keeps it negative for a\nbyte-stream substream, so the following memcpy(buffer, ..., count1) runs\nwith a (size_t)-1 length and writes far past the transfer buffer, which\nwas allocated with usb_alloc_coherent(ep->max_transfer).\n\nThis is the same class of bug that was fixed for snd_usbmidi_akai_output()\nin commit 0970274613fb (\"ALSA: usb-audio: fix OOB write in\nsnd_usbmidi_akai_output()\"); the novation output routine was left\nunguarded. Bail out when the endpoint cannot hold the two-byte header\nplus at least one payload byte.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 558fc4485ecc704edfe7876d6cebae4738ff7ef8`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9c8212436631b0063cb021e9f58df438e3db84d0`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e9c00d7533f99aa9833c4b598f47e3b3202fdb9a`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 94e4562fcc81badd1d467ddfb88c27e4fae974c2`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7f00dbddb51f4f74325cdc7c3f6b19fb3392481a`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1074c2306901b44ebcb83855583c6776e1e392ea`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1035a8f63bae28e498b0e7b5ac91d749844a7158`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}