CVE-2025-68766

Out-of-bounds access via accepted invalid hardware IRQ

Published Jan 5, 2026 · Updated Jan 5, 2026

Out-of-bounds access in the Linux kernel Microchip EIC interrupt controller allows attackers to access invalid memory via malformed IRQ data. The mchp_eic_domain_alloc() function detects hwirq values of 2 or greater but leaves its return code at success, then uses the invalid value to index the two-entry eic->irqs array. Reachability requires the Microchip EIC driver and an invalid firmware interrupt specification; no unprivileged runtime trigger is documented.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
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 access in the Linux kernel Microchip EIC interrupt controller allows attackers to access invalid memory via malformed IRQ data. The mchp_eic_domain_alloc() function detects hwirq values of 2 or greater but leaves its return code at success, then uses the invalid value to index the two-entry eic->irqs array. Reachability requires the Microchip EIC driver and an invalid firmware interrupt specification; no unprivileged runtime trigger is documented.

The record

CVE
CVE-2025-68766
Published
Jan 5, 2026
Updated
Jan 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 5, 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=00fa3461c86dd289b441d4d5a6bb236064bd207b <09efe7cfbf919c4d763bc425473fcfee0dc98356
  2. Affected versionversion=00fa3461c86dd289b441d4d5a6bb236064bd207b <3873afcb57614c1aaa5b6715554d6d1c22cac95a
  3. Affected versionversion=00fa3461c86dd289b441d4d5a6bb236064bd207b <7dbc0d40d8347bd9de55c904f59ea44bcc8dedb7
  4. Affected versionversion=00fa3461c86dd289b441d4d5a6bb236064bd207b <efd65e2e2fd96f7aaa5cb07d79bbbfcfc80aa552
  5. Affected versionversion=5.16

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linux Kernelversion=00fa3461c86dd289b441d4d5a6bb236064bd207b <09efe7cfbf919c4d763bc425473fcfee0dc98356; version=00fa3461c86dd289b441d4d5a6bb236064bd207b <3873afcb57614c1aaa5b6715554d6d1c22cac95a; version=00fa3461c86dd289b441d4d5a6bb236064bd207b <7dbc0d40d8347bd9de55c904f59ea44bcc8dedb7; version=00fa3461c86dd289b441d4d5a6bb236064bd207b <efd65e2e2fd96f7aaa5cb07d79bbbfcfc80aa552; version=5.16

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.

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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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