CVE-2026-23318

Memory disclosure or crash via unvalidated UAC3 header

Published Mar 25, 2026 · Updated Mar 25, 2026

Out-of-bounds read in the Linux Kernel ALSA usb-audio driver allows physically proximate attackers to expose memory or crash systems. The sound/usb/validate.c table labels the UAC3 AC header validator as UAC_VERSION_2, so real UAC3 descriptors never match and truncated fields remain unchecked. Exploitation requires attaching a crafted UAC3 USB audio device; subsequent descriptor access reads beyond the supplied header, disclosing memory or interrupting the system.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux Kernel ALSA usb-audio driver allows physically proximate attackers to expose memory or crash systems. The sound/usb/validate.c table labels the UAC3 AC header validator as UAC_VERSION_2, so real UAC3 descriptors never match and truncated fields remain unchecked. Exploitation requires attaching a crafted UAC3 USB audio device; subsequent descriptor access reads beyond the supplied header, disclosing memory or interrupting the system.

The record

CVE
CVE-2026-23318
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17821e2fb16752f5d363fb5c3f8aab4df41b9bcc
  2. Affected versionversion=5.4
  3. Affected versionversion=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f
  4. Affected versionversion=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <1e5753ff4c2e86aa88516f97a224c90a3d0b133e
  5. Affected versionversion=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <499ffd15b00dc91ac95c28f76959dfb5cdcc84d5
  6. Affected versionversion=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <54f9d645a5453d0bfece0c465d34aaf072ea99fa
  7. Affected versionversion=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc
  8. Affected versionversion=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <d3904ca40515272681ae61ad6f561c24f190957f
  9. Affected versionversion=bf74a46aebb1b5ab5e5f25bafa4ae0a453ba813a

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=17821e2fb16752f5d363fb5c3f8aab4df41b9bcc; version=5.4; version=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f; version=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <1e5753ff4c2e86aa88516f97a224c90a3d0b133e; version=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <499ffd15b00dc91ac95c28f76959dfb5cdcc84d5; version=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <54f9d645a5453d0bfece0c465d34aaf072ea99fa; version=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc; version=57f8770620e9b51c61089751f0b5ad3dbe376ff2 <d3904ca40515272681ae61ad6f561c24f190957f; version=bf74a46aebb1b5ab5e5f25bafa4ae0a453ba813a

Published CVSS scores

6.6OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
7.1UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1200Hardware Additions

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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