CVE-2024-26656Public exploit

Local kernel crash via failed HMM registration

Published Apr 2, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux AMDGPU driver allows local users to crash the kernel through an invalid GEM user-pointer ioctl. When amdgpu_hmm_register rejects an overflowing address-and-size range, object cleanup still calls amdgpu_hmm_unregister on an unregistered notifier. Access to an AMD GPU render node is required; one crafted ioctl reaches the bad teardown path and interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux AMDGPU driver allows local users to crash the kernel through an invalid GEM user-pointer ioctl. When amdgpu_hmm_register rejects an overflowing address-and-size range, object cleanup still calls amdgpu_hmm_unregister on an unregistered notifier. Access to an AMD GPU render node is required; one crafted ioctl reaches the bad teardown path and interrupts the host.

The record

CVE
CVE-2024-26656
Published
Apr 2, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.2
  2. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <22207fd5c80177b860279653d017474b2812af5e
  3. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <22f665ecfd1225afa1309ace623157d12bb9bb0c
  4. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <2e13f88e01ae7e28a7e831bf5c2409c4748e0a60
  5. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <af054a5fb24a144f99895afce9519d709891894c
  6. Affected versionversion=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <e87e08c94c9541b4e18c4c13f2f605935f512605

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <22207fd5c80177b860279653d017474b2812af5e; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <22f665ecfd1225afa1309ace623157d12bb9bb0c; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <2e13f88e01ae7e28a7e831bf5c2409c4748e0a60; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <af054a5fb24a144f99895afce9519d709891894c; version=d38ceaf99ed015f2a0b9af3499791bd3a3daae21 <e87e08c94c9541b4e18c4c13f2f605935f512605

Published CVSS scores

5.5UbuntuCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

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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