CVE-2026-89819

Kernel crash via unchecked plane degamma LUT size

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds read in Linux 6.8 allows local users to crash the kernel through a malformed AMD plane degamma LUT blob. __set_dm_plane_degamma() accepts an unchecked entry count, allowing __is_lut_linear() to divide by zero or __drm_lut_to_dc_gamma() to read beyond a short blob. The path is exposed only when AMD_PRIVATE_COLOR is enabled, and successful triggering interrupts the affected system.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux 6.8 allows local users to crash the kernel through a malformed AMD plane degamma LUT blob. __set_dm_plane_degamma() accepts an unchecked entry count, allowing __is_lut_linear() to divide by zero or __drm_lut_to_dc_gamma() to read beyond a short blob. The path is exposed only when AMD_PRIVATE_COLOR is enabled, and successful triggering interrupts the affected system.

The record

CVE
CVE-2026-89819
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=6.8
  2. Affected versionversion=980f8710075acaeb226a94cde6dda8ffad30123c <0b2615b8b54f58bbdf986dffb38cbc35214a5cc5
  3. Affected versionversion=980f8710075acaeb226a94cde6dda8ffad30123c <b10cc09b329245c6d95f8fa3e7f068575e3e0e9f
  4. Affected versionversion=980f8710075acaeb226a94cde6dda8ffad30123c <e4c3ab59021e7c146a84b6671f0d530972bd58b4
  5. Affected versionversion=980f8710075acaeb226a94cde6dda8ffad30123c <f6f04d8ae5725bcc893bdc62e3467efd97255c5b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=980f8710075acaeb226a94cde6dda8ffad30123c <0b2615b8b54f58bbdf986dffb38cbc35214a5cc5; version=980f8710075acaeb226a94cde6dda8ffad30123c <b10cc09b329245c6d95f8fa3e7f068575e3e0e9f; version=980f8710075acaeb226a94cde6dda8ffad30123c <e4c3ab59021e7c146a84b6671f0d530972bd58b4; version=980f8710075acaeb226a94cde6dda8ffad30123c <f6f04d8ae5725bcc893bdc62e3467efd97255c5b

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service

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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