CVE-2026-72304

Local availability loss via stale-byte copy length

Published Aug 15, 2026 · Updated Aug 15, 2026

Incorrect-length buffer access in Linux allows local users to corrupt SOF IPC4 control data through a crafted control update. The sof_ipc4_bytes_put() function takes the copy length from the existing buffer header instead of validating and using the incoming ucontrol sof_abi_hdr.size, so changed sizes truncate new data or copy stale bytes. A low-privileged local user must reach the ASoC SOF IPC4 control path; public sources identify availability loss but do not specify whether the interruption is a hang, crash, or restart.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect-length buffer access in Linux allows local users to corrupt SOF IPC4 control data through a crafted control update. The sof_ipc4_bytes_put() function takes the copy length from the existing buffer header instead of validating and using the incoming ucontrol sof_abi_hdr.size, so changed sizes truncate new data or copy stale bytes. A low-privileged local user must reach the ASoC SOF IPC4 control path; public sources identify availability loss but do not specify whether the interruption is a hang, crash, or restart.

The record

CVE
CVE-2026-72304
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-805, T1499.004
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=6.4
  2. Affected versionversion=a062c8899fede2ab5660a817e9b602d3fa280a99 <038406abde0d0883419ec89425ea941ec8bbef95
  3. Affected versionversion=a062c8899fede2ab5660a817e9b602d3fa280a99 <266f936db83aee6ca6473bbb06259bda52bf4fc3
  4. Affected versionversion=a062c8899fede2ab5660a817e9b602d3fa280a99 <3ad673e7139cf214afd24321a829aad6575f4163
  5. Affected versionversion=a062c8899fede2ab5660a817e9b602d3fa280a99 <4cf6a7ebbf8787393b158b2cc341723e5bebc4a8
  6. Affected versionversion=a062c8899fede2ab5660a817e9b602d3fa280a99 <fb4293173db2d474d8fbc0e5ecf4943e6df2b40e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=a062c8899fede2ab5660a817e9b602d3fa280a99 <038406abde0d0883419ec89425ea941ec8bbef95; version=a062c8899fede2ab5660a817e9b602d3fa280a99 <266f936db83aee6ca6473bbb06259bda52bf4fc3; version=a062c8899fede2ab5660a817e9b602d3fa280a99 <3ad673e7139cf214afd24321a829aad6575f4163; version=a062c8899fede2ab5660a817e9b602d3fa280a99 <4cf6a7ebbf8787393b158b2cc341723e5bebc4a8; version=a062c8899fede2ab5660a817e9b602d3fa280a99 <fb4293173db2d474d8fbc0e5ecf4943e6df2b40e

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/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 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-805Buffer Access with Incorrect Length Value
T1499.004Application or System Exploitation

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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