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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 00cc659a42ac4e94ec880fae2c9bf22fce69c2e8, 0970274613fb463d376211450cab066d34ebfe6a, 29a4c29943631301e85f5e9d10f25741bd78e7ba; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 00cc659a42ac4e94ec880fae2c9bf22fce69c2e8, 0970274613fb463d376211450cab066d34ebfe6a, 29a4c29943631301e85f5e9d10f25741bd78e7ba; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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>

—No exploit Fix available
Published
Aug 15, 2026
Updated
Aug 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.35affected
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before 78dfdeb8d2065524ed5928d6470bf3d3244d1009affected · git
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before 00cc659a42ac4e94ec880fae2c9bf22fce69c2e8affected · git
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before ce949d66607cfb000b8d8d84f80f35a886e72683affected · git
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before 29a4c29943631301e85f5e9d10f25741bd78e7baaffected · git
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before 9b22a5c8310b0d55d04f5f0159b913a2fb8b444faffected · git
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081affected · git
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before 2b7a0f330dd90dd1a7657cec0db019ee1efa4372affected · git
    • 4434ade8c9334a3ab975d8993de456f06841899e and later · before 0970274613fb463d376211450cab066d34ebfe6aaffected · git
    • before 2.6.35not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74494Aug 15, 2026 · ksmbd: reject repeated SMB2 NEGOTIATE requests
    0Monitor
  • ← EarlierCVE-2026-74498Aug 15, 2026 · ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set
    0Monitor
  • Later →CVE-2026-74500Aug 15, 2026 · ALSA: usb-audio: fix stack info leak in RME Digiface status
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux00cc659a42ac4e94ec880fae2c9bf22fce69c2e8Vendor (CNA)
Linux Linux0970274613fb463d376211450cab066d34ebfe6aVendor (CNA)
Linux Linux29a4c29943631301e85f5e9d10f25741bd78e7baVendor (CNA)
Linux Linux2b7a0f330dd90dd1a7657cec0db019ee1efa4372Vendor (CNA)
Linux Linux78dfdeb8d2065524ed5928d6470bf3d3244d1009Vendor (CNA)
Linux Linux9b22a5c8310b0d55d04f5f0159b913a2fb8b444fVendor (CNA)
Linux Linuxb5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081Vendor (CNA)
Linux Linuxce949d66607cfb000b8d8d84f80f35a886e72683Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records