Unknown

CVE-2026-80829 — ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()

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.

Published Sep 4, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 27, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 558fc4485ecc704edfe7876d6cebae4738ff7ef8≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 9c8212436631b0063cb021e9f58df438e3db84d0≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < e9c00d7533f99aa9833c4b598f47e3b3202fdb9a≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 94e4562fcc81badd1d467ddfb88c27e4fae974c2≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 7f00dbddb51f4f74325cdc7c3f6b19fb3392481a≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 1074c2306901b44ebcb83855583c6776e1e392ea and 2 more ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 1035a8f63bae28e498b0e7b5ac91d749844a7158version 2.6.12	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 27, 2026 · 12 reading(s) · max 0.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

11 on the record

git.kernel.org/stable/c/e9c00d7533f99aa9833c4b598f47e3b3202fdb9a
NIST National Vulnerability Database
git.kernel.org/stable/c/558fc4485ecc704edfe7876d6cebae4738ff7ef8
NIST National Vulnerability Database
git.kernel.org/stable/c/91919b3b99ab7ce3d7dbb39fcf7c6c742a663c0c
NIST National Vulnerability Database
git.kernel.org/stable/c/7639ec9755d3ec0ec8cd7c0fdd2c3d3997434870
NIST National Vulnerability Database
git.kernel.org/stable/c/7f00dbddb51f4f74325cdc7c3f6b19fb3392481a
NIST National Vulnerability Database
git.kernel.org/stable/c/1074c2306901b44ebcb83855583c6776e1e392ea
NIST National Vulnerability Database
git.kernel.org/stable/c/94e4562fcc81badd1d467ddfb88c27e4fae974c2
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-80829
GitHub Security Advisories
git.kernel.org/stable/c/9c8212436631b0063cb021e9f58df438e3db84d0
NIST National Vulnerability Database
github.com/advisories/GHSA-vx4g-2353-jv9w
GitHub Security Advisories
git.kernel.org/stable/c/1035a8f63bae28e498b0e7b5ac91d749844a7158
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 7h
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 7h
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 7h
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 7h
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 7h
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 7h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80829 is "ALSA: usb-audio: fix OOB write in snd_usbmidi_novation_output()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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