CVE-2024-56568

Host crash via ARM SMMU probe race

Published Dec 27, 2024 · Updated May 11, 2026

Race condition in the Linux kernel ARM SMMU driver allows local users to crash the device through concurrent client and SMMU probing. arm_smmu_probe_device() dereferences smmu->streamid_mask after arm_smmu_get_by_fwnode() races with driver binding and returns a null pointer. Triggering the failure requires local access and a probe-order race on a system using the ARM SMMU driver; success interrupts the device until recovery.

CVSS severity4.7
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel ARM SMMU driver allows local users to crash the device through concurrent client and SMMU probing. arm_smmu_probe_device() dereferences smmu->streamid_mask after arm_smmu_get_by_fwnode() races with driver binding and returns a null pointer. Triggering the failure requires local access and a probe-order race on a system using the ARM SMMU driver; success interrupts the device until recovery.

The record

CVE
CVE-2024-56568
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE 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

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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=021bb8420d44cf56102d44fca9af628625e75482 <229e6ee43d2a160a1592b83aad620d6027084aad
  2. Affected versionversion=021bb8420d44cf56102d44fca9af628625e75482 <4a9485918a042e3114890dfbe19839a1897f8b2c
  3. Affected versionversion=021bb8420d44cf56102d44fca9af628625e75482 <5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8
  4. Affected versionversion=021bb8420d44cf56102d44fca9af628625e75482 <c2527d07c7e9cda2c6165d5edccf74752baac1b0
  5. Affected versionversion=021bb8420d44cf56102d44fca9af628625e75482 <dc02407ea952e20c544a078a6be2e6f008327973
  6. Affected versionversion=021bb8420d44cf56102d44fca9af628625e75482 <f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5
  7. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=021bb8420d44cf56102d44fca9af628625e75482 <229e6ee43d2a160a1592b83aad620d6027084aad; version=021bb8420d44cf56102d44fca9af628625e75482 <4a9485918a042e3114890dfbe19839a1897f8b2c; version=021bb8420d44cf56102d44fca9af628625e75482 <5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8; version=021bb8420d44cf56102d44fca9af628625e75482 <c2527d07c7e9cda2c6165d5edccf74752baac1b0; version=021bb8420d44cf56102d44fca9af628625e75482 <dc02407ea952e20c544a078a6be2e6f008327973; version=021bb8420d44cf56102d44fca9af628625e75482 <f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5; version=4.9

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CISA-ADPCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-476NULL Pointer Dereference
T1499Endpoint 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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