CVE-2025-21989

System crash via missing display callback

Published Apr 2, 2025 · Updated May 11, 2026

NULL pointer dereference in affected Linux kernel builds allows local users to crash PCs during AMDGPU display driver loading. The dce60_tg_funcs table omits the is_two_pixels_per_container callback, and display initialization calls through the resulting NULL function pointer. Reachability requires an older AMD GPU and AMDGPU loading with amdgpu.dc=1; dereferencing the missing callback interrupts the entire host.

CVSS severity5.5
Medium
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

NULL pointer dereference in affected Linux kernel builds allows local users to crash PCs during AMDGPU display driver loading. The dce60_tg_funcs table omits the is_two_pixels_per_container callback, and display initialization calls through the resulting NULL function pointer. Reachability requires an older AMD GPU and AMDGPU loading with amdgpu.dc=1; dereferencing the missing callback interrupts the entire host.

The record

CVE
CVE-2025-21989
Published
Apr 2, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.11
  2. Affected versionversion=e6a901a00822659181c93c86d8bbc2a17779fddc <36d04c9313d8d83ead92242f037099ac73e02120
  3. Affected versionversion=e6a901a00822659181c93c86d8bbc2a17779fddc <e204aab79e01bc8ff750645666993ed8b719de57
  4. Affected versionversion=e6a901a00822659181c93c86d8bbc2a17779fddc <fefa811e616b5d0b555ed65743e528a0a8a0b377

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=e6a901a00822659181c93c86d8bbc2a17779fddc <36d04c9313d8d83ead92242f037099ac73e02120; version=e6a901a00822659181c93c86d8bbc2a17779fddc <e204aab79e01bc8ff750645666993ed8b719de57; version=e6a901a00822659181c93c86d8bbc2a17779fddc <fefa811e616b5d0b555ed65743e528a0a8a0b377

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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