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NVD / CVE Program· CNA Linux

CVE-2026-74498: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set

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 04595233e5606d452f9f47e6989fc7ae7440fd40, 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8, 3852974608f53e530e27c21d0c6c7d79c17b3f5a; 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 04595233e5606d452f9f47e6989fc7ae7440fd40, 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8, 3852974608f53e530e27c21d0c6c7d79c17b3f5a; 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 DMA buffer out-of-bounds write when fill_max is set When a USB audio endpoint requests full packet transfers via the fill_max descriptor flag, data_ep_set_params() promotes ep->curpacksize to ep->maxpacksize. However, maxsize is left at the original sample-rate derived value. Since u->buffer_size is allocated as maxsize * packets, the resulting DMA buffer is far too small for the requested transfer length. When the USB host controller streams up to curpacksize bytes per packet, it writes past the end of the buffer via DMA, corrupting kernel heap memory. Update maxsize to curpacksize when fill_max is set so that the allocated DMA buffer size matches the actual transfer request size. [ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]

—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%

Get told when this record changes

  • 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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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

    • 3.5affected
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8affected · git
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before b1770f9ac35c0ffc34914d52347c65dcd5ac049baffected · git
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66caffected · git
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before 3852974608f53e530e27c21d0c6c7d79c17b3f5aaffected · git
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before f9b6c9576568169139ac151f7881474f384659fdaffected · git
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before 04595233e5606d452f9f47e6989fc7ae7440fd40affected · git
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before bd65b7191683bebd9923904f0558b9211b9129daaffected · git
    • 8fdff6a319e7dac757c558bd283dc4577e68cde7 and later · before d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5affected · git
    • before 3.5not 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-2026-74491Aug 15, 2026 · of/address: Fix NULL bus dereference in of_pci_range_parser_one()
    0Monitor
  • ← EarlierCVE-2026-74494Aug 15, 2026 · ksmbd: reject repeated SMB2 NEGOTIATE requests
    0Monitor
  • Later →CVE-2026-74499Aug 15, 2026 · ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()
    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 Linux04595233e5606d452f9f47e6989fc7ae7440fd40Vendor (CNA)
Linux Linux10c24e6fddf4bdff0b6b05a47a4347b38e6960e8Vendor (CNA)
Linux Linux3852974608f53e530e27c21d0c6c7d79c17b3f5aVendor (CNA)
Linux Linux6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66cVendor (CNA)
Linux Linuxb1770f9ac35c0ffc34914d52347c65dcd5ac049bVendor (CNA)
Linux Linuxbd65b7191683bebd9923904f0558b9211b9129daVendor (CNA)
Linux Linuxd0199ae1666ff9ae2d1d568d64c3430d4c47f0e5Vendor (CNA)
Linux Linuxf9b6c9576568169139ac151f7881474f384659fdVendor (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