CVE-2026-80900Hinoki check available

Out-of-bounds access via underflowed UMP size check

Published Sep 4, 2026 · Updated Sep 4, 2026

Improper bounds checking in ASoC SDCA UMP handling in Linux 6.19 allows attackers to cause out-of-range device-register access via invalid offsets. In sdca_ump_read_message and sdca_ump_write_message, subtracting an oversized message offset from the unsigned buffer length underflows, so the subsequent length comparison accepts the access. Reachability depends on an SDCA audio path supplying or using an invalid UMP offset; the Linux notice does not specify the resulting confidentiality, integrity, or availability impact.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper bounds checking in ASoC SDCA UMP handling in Linux 6.19 allows attackers to cause out-of-range device-register access via invalid offsets. In sdca_ump_read_message and sdca_ump_write_message, subtracting an oversized message offset from the unsigned buffer length underflows, so the subsequent length comparison accepts the access. Reachability depends on an SDCA audio path supplying or using an invalid UMP offset; the Linux notice does not specify the resulting confidentiality, integrity, or availability impact.

The record

CVE
CVE-2026-80900
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=6.19
  2. Affected versionversion=daab108504be73182c16a72b9cfe47ac3b1928ca <556d872e7c2a0b570c5b0974813847ef0d0cd637
  3. Affected versionversion=daab108504be73182c16a72b9cfe47ac3b1928ca <fe5c53a952970ba15be8f512babd922e273579de

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=daab108504be73182c16a72b9cfe47ac3b1928ca <556d872e7c2a0b570c5b0974813847ef0d0cd637; version=daab108504be73182c16a72b9cfe47ac3b1928ca <fe5c53a952970ba15be8f512babd922e273579de

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
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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