CVE-2024-44954

Kernel memory disclosure via MIDI buffer race

Published Sep 4, 2024 · Updated Aug 5, 2026

Race condition in the ALSA Line 6 MIDI driver in Linux 2.6.30 and later allows local users to read stale kernel heap data. Concurrent URB completion and rawmidi paths update the line6 midibuf read, write, and full state without shared locking, allowing unwritten slab bytes to reach snd_rawmidi_receive(). A Line 6 USB device and local rawmidi access are required; the demonstrated consequence is kernel-memory disclosure to user space.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the ALSA Line 6 MIDI driver in Linux 2.6.30 and later allows local users to read stale kernel heap data. Concurrent URB completion and rawmidi paths update the line6 midibuf read, write, and full state without shared locking, allowing unwritten slab bytes to reach snd_rawmidi_receive(). A Line 6 USB device and local rawmidi access are required; the demonstrated consequence is kernel-memory disclosure to user space.

The record

CVE
CVE-2024-44954
Published
Sep 4, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2.6.30
  2. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <15b7a03205b31bc5623378c190d22b7ff60026f1
  3. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <40f3d5cb0e0cbf7fa697913a27d5d361373bdcf5
  4. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <51d87f11dd199bbc6a85982b088ff27bde53b48a
  5. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <535df7f896a568a8a1564114eaea49d002cb1747
  6. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <643293b68fbb6c03f5e907736498da17d43f0d81
  7. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <a54da4b787dcac60b598da69c9c0072812b8282d
  8. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <c80f454a805443c274394b1db0d1ebf477abd94e
  9. Affected versionversion=705ececd1c60d0f5d6ef2a719008847883516970 <e7e7d2b180d8f297cea6db43ea72402fd33e1a29

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.30; version=705ececd1c60d0f5d6ef2a719008847883516970 <15b7a03205b31bc5623378c190d22b7ff60026f1; version=705ececd1c60d0f5d6ef2a719008847883516970 <40f3d5cb0e0cbf7fa697913a27d5d361373bdcf5; version=705ececd1c60d0f5d6ef2a719008847883516970 <51d87f11dd199bbc6a85982b088ff27bde53b48a; version=705ececd1c60d0f5d6ef2a719008847883516970 <535df7f896a568a8a1564114eaea49d002cb1747; version=705ececd1c60d0f5d6ef2a719008847883516970 <643293b68fbb6c03f5e907736498da17d43f0d81; version=705ececd1c60d0f5d6ef2a719008847883516970 <a54da4b787dcac60b598da69c9c0072812b8282d; version=705ececd1c60d0f5d6ef2a719008847883516970 <c80f454a805443c274394b1db0d1ebf477abd94e; version=705ececd1c60d0f5d6ef2a719008847883516970 <e7e7d2b180d8f297cea6db43ea72402fd33e1a29

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1005Data from Local System

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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