CVE-2026-93223

OF-node refcount underflow via malformed device tree

Published Sep 24, 2026 · Updated Sep 24, 2026

Reference-count underflow in Linux kernel 6.5 allows attackers to corrupt an OF-node count through malformed Tegra VIP device-tree data. The tegra_vip_channel_of_parse function borrows dev->of_node without acquiring a reference, then sends parse failures to err_node_put, which releases that borrowed node. Triggering requires a Tegra20 VIP device and malformed endpoint data during driver initialization; published material identifies the reference-count underflow but no further consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reference-count underflow in Linux kernel 6.5 allows attackers to corrupt an OF-node count through malformed Tegra VIP device-tree data. The tegra_vip_channel_of_parse function borrows dev->of_node without acquiring a reference, then sends parse failures to err_node_put, which releases that borrowed node. Triggering requires a Tegra20 VIP device and malformed endpoint data during driver initialization; published material identifies the reference-count underflow but no further consequence.

The record

CVE
CVE-2026-93223
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=6.5
  2. Affected versionversion=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <1295ba29ac590bbb5c4a586afd408018168af10b
  3. Affected versionversion=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <656d047dc0c29c0964d840217a0593f16aa9bc5e
  4. Affected versionversion=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <7393372f79db940acff206b43e2905685a0c57ad
  5. Affected versionversion=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <a3783800c9475fa58b8db0885893f96a23f949da
  6. Affected versionversion=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <fc9937019cf7e2fe4e29f9341e6400bcd2cde721

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <1295ba29ac590bbb5c4a586afd408018168af10b; version=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <656d047dc0c29c0964d840217a0593f16aa9bc5e; version=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <7393372f79db940acff206b43e2905685a0c57ad; version=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <a3783800c9475fa58b8db0885893f96a23f949da; version=e740d199cf0ff1e53ddc2ab067c0a09b55845d68 <fc9937019cf7e2fe4e29f9341e6400bcd2cde721

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.

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)
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.

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Technologies

Your stack

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Your stack

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