CVE-2026-74388

Kernel use-after-free via stale SysEx pointer

Published Aug 15, 2026 · Updated Aug 15, 2026

A use-after-free in the Linux kernel ALSA OSS sequencer allows local users to read freed memory through a SysEx event race. A pending event retains data.ext.ptr after snd_seq_oss_midi_check_exit_port releases the port resources, and snd_seq_event_dup later copies from that stale pointer. Reaching the flaw requires access to an OSS sequencer device and a concurrent port close before dispatch; the reported result is a KASAN-detected kernel memory violation.

CVSS severity7.0
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in the Linux kernel ALSA OSS sequencer allows local users to read freed memory through a SysEx event race. A pending event retains data.ext.ptr after snd_seq_oss_midi_check_exit_port releases the port resources, and snd_seq_event_dup later copies from that stale pointer. Reaching the flaw requires access to an OSS sequencer device and a concurrent port close before dispatch; the reported result is a KASAN-detected kernel memory violation.

The record

CVE
CVE-2026-74388
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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 <6dc781778b595be94c31395b2cb167f65145d91f
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7aad70cabd8f34cf11a9593fcd3f2ac3f5496943
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c349b4f2a603202fb8c363bd2774a22ac2fddf3
  4. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6dc781778b595be94c31395b2cb167f65145d91f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7aad70cabd8f34cf11a9593fcd3f2ac3f5496943; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c349b4f2a603202fb8c363bd2774a22ac2fddf3; version=2.6.12

Published CVSS scores

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.

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

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

No sourced classifications are available.

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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