Unknown

CVE-2026-74499 — ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output() snd_usbmidi_akai_output() computes its fill-loop bound buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1; as a signed int, so a small device-advertised bulk-OUT max_transfer makes buf_end negative. The loop guard then compares the u32 urb->transfer_buffer_length against that negative int: the usual arithmetic conversion turns buf_end into a large unsigned value, so the guard stays true and each iteration keeps appending SysEx framing and payload bytes past the end of the URB transfer buffer, which is only max_transfer bytes long. A USB device that advertises a tiny bulk-OUT endpoint can therefore trigger an attacker-length- and content-controlled heap out-of-bounds write when a process writes to the created /dev/snd/midiC*D* node. Return early when there is no room for even one SysEx, so the loop is never entered with a bound that would wrap. The loop is the last statement of the function, so bailing out is equivalent to it not running. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Published Aug 15, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · 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

0.18%

ahead of 7% of scored CVEs · Oct 29, 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	≥ 4434ade8c9334a3ab975d8993de456f06841899e and < 78dfdeb8d2065524ed5928d6470bf3d3244d1009≥ 4434ade8c9334a3ab975d8993de456f06841899e and < 00cc659a42ac4e94ec880fae2c9bf22fce69c2e8≥ 4434ade8c9334a3ab975d8993de456f06841899e and < ce949d66607cfb000b8d8d84f80f35a886e72683≥ 4434ade8c9334a3ab975d8993de456f06841899e and < 29a4c29943631301e85f5e9d10f25741bd78e7ba≥ 4434ade8c9334a3ab975d8993de456f06841899e and < 9b22a5c8310b0d55d04f5f0159b913a2fb8b444f≥ 4434ade8c9334a3ab975d8993de456f06841899e and < b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081≥ 4434ade8c9334a3ab975d8993de456f06841899e and < 2b7a0f330dd90dd1a7657cec0db019ee1efa4372≥ 4434ade8c9334a3ab975d8993de456f06841899e and < 0970274613fb463d376211450cab066d34ebfe6a and 1 more version 2.6.35	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 29, 2026 · 14 reading(s) · max 0.18%

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
Aug 15, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/ce949d66607cfb000b8d8d84f80f35a886e72683
NIST National Vulnerability Database
git.kernel.org/stable/c/0970274613fb463d376211450cab066d34ebfe6a
NIST National Vulnerability Database
git.kernel.org/stable/c/2b7a0f330dd90dd1a7657cec0db019ee1efa4372
NIST National Vulnerability Database
git.kernel.org/stable/c/b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081
NIST National Vulnerability Database
git.kernel.org/stable/c/29a4c29943631301e85f5e9d10f25741bd78e7ba
NIST National Vulnerability Database
git.kernel.org/stable/c/9b22a5c8310b0d55d04f5f0159b913a2fb8b444f
NIST National Vulnerability Database
git.kernel.org/stable/c/00cc659a42ac4e94ec880fae2c9bf22fce69c2e8
NIST National Vulnerability Database
git.kernel.org/stable/c/78dfdeb8d2065524ed5928d6470bf3d3244d1009
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 2d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 2d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 2d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 2d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 2d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 2d

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-2026-74499 is "ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_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 0.18% 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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