CVE-2026-89470

Kernel memory corruption via unchecked port counts

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds write in the Linux cros_usbpd charger driver allows attackers controlling an embedded controller to corrupt kernel memory. The probe trusts matching USB PD and charger port counts up to 255 and uses the charger count to index an eight-entry ports array without enforcing EC_USB_PD_MAX_PORTS. Reachability requires a malicious or compromised ChromeOS embedded controller to supply excessive counts during driver probing; the documented consequence is a slab overwrite of up to 247 pointers.

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

What happened

Out-of-bounds write in the Linux cros_usbpd charger driver allows attackers controlling an embedded controller to corrupt kernel memory. The probe trusts matching USB PD and charger port counts up to 255 and uses the charger count to index an eight-entry ports array without enforcing EC_USB_PD_MAX_PORTS. Reachability requires a malicious or compromised ChromeOS embedded controller to supply excessive counts during driver probing; the documented consequence is a slab overwrite of up to 247 pointers.

The record

CVE
CVE-2026-89470
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=3af15cfacd1eef7f223802d49a88cae23c509183 <304a29ac55ba3ee6eceaf7d83d09cd9709f3bf60
  2. Affected versionversion=3af15cfacd1eef7f223802d49a88cae23c509183 <4b1f2be1e1b74a50386ba718de3d62bfcf5ee701
  3. Affected versionversion=3af15cfacd1eef7f223802d49a88cae23c509183 <657cd3a42e937276262c0a8ae6b01a87004309de
  4. Affected versionversion=3af15cfacd1eef7f223802d49a88cae23c509183 <fd5f289cca04ad869b34fc9ccb647670bfdb60ac
  5. Affected versionversion=4.20

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=3af15cfacd1eef7f223802d49a88cae23c509183 <304a29ac55ba3ee6eceaf7d83d09cd9709f3bf60; version=3af15cfacd1eef7f223802d49a88cae23c509183 <4b1f2be1e1b74a50386ba718de3d62bfcf5ee701; version=3af15cfacd1eef7f223802d49a88cae23c509183 <657cd3a42e937276262c0a8ae6b01a87004309de; version=3af15cfacd1eef7f223802d49a88cae23c509183 <fd5f289cca04ad869b34fc9ccb647670bfdb60ac; version=4.20

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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