CVE-2026-74278

Kernel-address disclosure via bounce error event

Published Aug 15, 2026 · Updated Aug 15, 2026

Information disclosure in the Linux ALSA sequencer allows local users to read a kernel heap address through a bounce error event. bounce_error_event() labels every client error as SNDRV_SEQ_EVENT_KERNEL_ERROR and places a raw snd_seq_event pointer in the fixed-length record copied to user space. A user client that provokes and reads an ALSA sequencer bounce event gains an address that can weaken kernel memory-layout protections; no data write or code execution is reported.

CVSS severity3.3
Low
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

Information disclosure in the Linux ALSA sequencer allows local users to read a kernel heap address through a bounce error event. bounce_error_event() labels every client error as SNDRV_SEQ_EVENT_KERNEL_ERROR and places a raw snd_seq_event pointer in the fixed-length record copied to user space. A user client that provokes and reads an ALSA sequencer bounce event gains an address that can weaken kernel memory-layout protections; no data write or code execution is reported.

The record

CVE
CVE-2026-74278
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-212
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 <0527a56cb327021cb73167cfddf0e49efa043500
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93d260ce43a81df579c98bee92b91316df9c1c57
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dae23c545eb5a2be3b27a82fd0f611894fb8ab69
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <efc86691e4d8083d9e380ea95042c2cf679f65fd
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0527a56cb327021cb73167cfddf0e49efa043500; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93d260ce43a81df579c98bee92b91316df9c1c57; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dae23c545eb5a2be3b27a82fd0f611894fb8ab69; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <efc86691e4d8083d9e380ea95042c2cf679f65fd; version=2.6.12

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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-212Improper Removal of Sensitive Information Before Storage or Transfer

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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