CVE-2026-23786

Kernel crash via DRM HDR TOCTOU race

Published Sep 14, 2026 · Updated Sep 14, 2026

A TOCTOU race in the DPU of Samsung Exynos 1280 firmware allows attackers to crash the kernel via unspecified vectors. The Exynos DRM HDR driver performs a check and a later use across a race window, so concurrently changed state drives a heap overflow. Samsung has not disclosed the required access or trigger, and the demonstrated consequence is a kernel crash rather than code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

A TOCTOU race in the DPU of Samsung Exynos 1280 firmware allows attackers to crash the kernel via unspecified vectors. The Exynos DRM HDR driver performs a check and a later use across a race window, so concurrently changed state drives a heap overflow. Samsung has not disclosed the required access or trigger, and the demonstrated consequence is a kernel crash rather than code execution.

The record

CVE
CVE-2026-23786
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Samsung Electronics
Product
Samsung Exynos 1280 Firmware
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 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=0 <=2025-12-24

What conditions does exploitation require?

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

What is affected?

Samsung Electronics · Samsung Exynos 1280 Firmwareversion=0 <=2025-12-24

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

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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