CVE-2026-23208

Kernel memory corruption via excessive USB audio frames

Published Feb 14, 2026 · Updated Feb 14, 2026

Out-of-bounds write in Linux Kernel ALSA USB audio allows local users to corrupt kernel memory through a crafted PCM playback write. The copy_to_urb path calculates frames from packsize[0] times packets without ensuring that the result fits the maxpacksize times packets URB buffer. Access to a USB-audio-backed ALSA PCM playback stream is required; the overflow can crash the kernel or corrupt adjacent kernel memory.

CVSS severity7.8
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 write in Linux Kernel ALSA USB audio allows local users to corrupt kernel memory through a crafted PCM playback write. The copy_to_urb path calculates frames from packsize[0] times packets without ensuring that the result fits the maxpacksize times packets URB buffer. Access to a USB-audio-backed ALSA PCM playback stream is required; the overflow can crash the kernel or corrupt adjacent kernel memory.

The record

CVE
CVE-2026-23208
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62932d9ed639a9fa71b4ac1a56766a4b43abb7e4
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef5749ef8b307bf8717945701b1b79d036af0a15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62932d9ed639a9fa71b4ac1a56766a4b43abb7e4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef5749ef8b307bf8717945701b1b79d036af0a15

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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