Answer in brief
CVE-2026-80829 records a Unknown severity vulnerability in ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <558fc4485ecc704edfe7876d6cebae4738ff7ef8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9c8212436631b0063cb021e9f58df438e3db84d0 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e9c00d7533f99aa9833c4b598f47e3b3202fdb9a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <94e4562fcc81badd1d467ddfb88c27e4fae974c2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7f00dbddb51f4f74325cdc7c3f6b19fb3392481a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1074c2306901b44ebcb83855583c6776e1e392ea || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1035a8f63bae28e498b0e7b5ac91d749844a7158 | 558fc4485ecc704edfe7876d6cebae4738ff7ef8, 9c8212436631b0063cb021e9f58df438e3db84d0, e9c00d7533f99aa9833c4b598f47e3b3202fdb9a, 94e4562fcc81badd1d467ddfb88c27e4fae974c2, 7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870, 91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c, 7f00dbddb51f4f74325cdc7c3f6b19fb3392481a, 1074c2306901b44ebcb83855583c6776e1e392ea, 1035a8f63bae28e498b0e7b5ac91d749844a7158 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 4, 2026
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output() snd_usbmidi_novation_output() lays out a two-byte header at transfer_buffer[0..1] and passes &transfer_buffer[2] together with a length of ep->max_transfer - 2 to snd_rawmidi_transmit(): count = snd_rawmidi_transmit(ep->ports[0].substream, &transfer_buffer[2], ep->max_transfer - 2); ep->max_transfer comes from the output endpoint's wMaxPacketSize via usb_maxpacket(). A malformed or malicious device can advertise a bulk OUT endpoint with a wMaxPacketSize of 1 - the USB core only clamps this value downwards - so ep->max_transfer becomes 1 and the count argument becomes -1. snd_rawmidi_transmit() passes the negative count on to __snd_rawmidi_transmit_peek(), where "if (count1 > count) count1 = count" leaves count1 negative; get_aligned_size() keeps it negative for a byte-stream substream, so the following memcpy(buffer, ..., count1) runs with a (size_t)-1 length and writes far past the transfer buffer, which was allocated with usb_alloc_coherent(ep->max_transfer). This is the same class of bug that was fixed for snd_usbmidi_akai_output() in commit 0970274613fb ("ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()"); the novation output routine was left unguarded. Bail out when the endpoint cannot hold the two-byte header plus at least one payload byte.
Quoted source text, attributed separately from HOL analysis.