CVE-2026-90220Hinoki check available

Kernel-address disclosure via unsanitized bounce payload

Published Sep 17, 2026 · Updated Sep 17, 2026

Linux ALSA information disclosure allows local users to read a kernel address through a queued event's bounce payload. The bounce_error_event() function embeds a failed variable-length event without clearing its extension-cell pointer, and snd_seq_expand_var_event() copies that pointer to userspace. An unprivileged client with ALSA sequencer access enables SNDRV_SEQ_FILTER_BOUNCE, queues an event to a nonexistent port, and reads the response, exposing eight bytes from its own pool on 64-bit systems.

CVSS severity3.3
Low
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Linux ALSA information disclosure allows local users to read a kernel address through a queued event's bounce payload. The bounce_error_event() function embeds a failed variable-length event without clearing its extension-cell pointer, and snd_seq_expand_var_event() copies that pointer to userspace. An unprivileged client with ALSA sequencer access enables SNDRV_SEQ_FILTER_BOUNCE, queues an event to a nonexistent port, and reads the response, exposing eight bytes from its own pool on 64-bit systems.

The record

CVE
CVE-2026-90220
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=0527a56cb327021cb73167cfddf0e49efa043500
  2. Affected versionversion=6.12.97 <6.12.110
  3. Affected versionversion=6.18.40 <6.18.52
  4. Affected versionversion=7.1.5 <7.2
  5. Affected versionversion=7.2
  6. Affected versionversion=93d260ce43a81df579c98bee92b91316df9c1c57 <42c3f856d13a91a0d4c302a0c6854813621136db
  7. Affected versionversion=dae23c545eb5a2be3b27a82fd0f611894fb8ab69 <b1e8d40663997aacaa198f37ce6893e07aaba77a
  8. Affected versionversion=efc86691e4d8083d9e380ea95042c2cf679f65fd <59e1592d3c270ff4642d5d6dc55c545306eb0693
  9. Affected versionversion=efc86691e4d8083d9e380ea95042c2cf679f65fd <6e6e471eef1d5d8cb056c7d364023fe048249204

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0527a56cb327021cb73167cfddf0e49efa043500; version=6.12.97 <6.12.110; version=6.18.40 <6.18.52; version=7.1.5 <7.2; version=7.2; version=93d260ce43a81df579c98bee92b91316df9c1c57 <42c3f856d13a91a0d4c302a0c6854813621136db; version=dae23c545eb5a2be3b27a82fd0f611894fb8ab69 <b1e8d40663997aacaa198f37ce6893e07aaba77a; version=efc86691e4d8083d9e380ea95042c2cf679f65fd <59e1592d3c270ff4642d5d6dc55c545306eb0693; version=efc86691e4d8083d9e380ea95042c2cf679f65fd <6e6e471eef1d5d8cb056c7d364023fe048249204

Published CVSS scores

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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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