CVE-2026-74642

System crash via delayed UMP endpoint dereference

Published Aug 22, 2026 · Updated Aug 22, 2026

Use-after-free in the ALSA USB MIDI2 endpoint code in Linux 6.6.151 and other affected versions allows local users to crash the system. The delayed release path calls ump_to_endpoint() after the associated UMP endpoint object has already been freed, so it dereferences stale endpoint data. Reachability requires ALSA USB MIDI2 support, use of a UMP endpoint, and execution of the delayed release path; the bounded consequence is a system crash.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the ALSA USB MIDI2 endpoint code in Linux 6.6.151 and other affected versions allows local users to crash the system. The delayed release path calls ump_to_endpoint() after the associated UMP endpoint object has already been freed, so it dereferences stale endpoint data. Reachability requires ALSA USB MIDI2 support, use of a UMP endpoint, and execution of the delayed release path; the bounded consequence is a system crash.

The record

CVE
CVE-2026-74642
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=49eccef6d6e1c00dac6fb2e7eb6f9206c33e1c37 <d431941825d357be7d9ab0cb7505e3a1963bd89e
  2. Affected versionversion=4a05b2d1b4642df74f30b6f54843e825c4a2bfd3 <f8a80cfb68613fb7e6452b66447dbc63f435d140
  3. Affected versionversion=6.12.103 <6.12.104
  4. Affected versionversion=6.18.44 <6.18.45
  5. Affected versionversion=6.6.151 <6.6.152
  6. Affected versionversion=7.1.8 <7.1.9
  7. Affected versionversion=8a7a33b846d6ba695891b8d0040027cdbad8cd52 <422d8a02de5ce6a29d616d55e5ead5dec69ac1d7
  8. Affected versionversion=ae388c0e1bf727972096f770f82d12e4f748d1b6 <f9d492a39ebeb1a56f13ec6dd165a18a48dec812
  9. Affected versionversion=cc014ebf803174f0e5d15956dfc5a38413c945ae <d217d723c5e43881b952cdb978477f7f2dc0b6d7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=49eccef6d6e1c00dac6fb2e7eb6f9206c33e1c37 <d431941825d357be7d9ab0cb7505e3a1963bd89e; version=4a05b2d1b4642df74f30b6f54843e825c4a2bfd3 <f8a80cfb68613fb7e6452b66447dbc63f435d140; version=6.12.103 <6.12.104; version=6.18.44 <6.18.45; version=6.6.151 <6.6.152; version=7.1.8 <7.1.9; version=8a7a33b846d6ba695891b8d0040027cdbad8cd52 <422d8a02de5ce6a29d616d55e5ead5dec69ac1d7; version=ae388c0e1bf727972096f770f82d12e4f748d1b6 <f9d492a39ebeb1a56f13ec6dd165a18a48dec812; version=cc014ebf803174f0e5d15956dfc5a38413c945ae <d217d723c5e43881b952cdb978477f7f2dc0b6d7

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8OracleCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499Endpoint Denial of Service

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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