CVE-2024-56589

CPU soft lockup via unyielding interrupt loop

Published Dec 27, 2024 · Updated May 11, 2026

Denial of service in the hisi_sas driver in affected Linux kernels allows local users to trigger a CPU soft lockup through sustained SAS I/O. On non-preemptible kernels, irq_wait_for_interrupt() repeatedly returns zero during interrupt storms, monopolizing the shared interrupt CPU and starving the watchdog thread. Reachability requires the hisi_sas v3 driver, an expander connected to 12 high-performance SAS SSDs, heavy interrupt load, and low-privileged local access; the bounded consequence is a CPU soft lockup and service interruption.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the hisi_sas driver in affected Linux kernels allows local users to trigger a CPU soft lockup through sustained SAS I/O. On non-preemptible kernels, irq_wait_for_interrupt() repeatedly returns zero during interrupt storms, monopolizing the shared interrupt CPU and starving the watchdog thread. Reachability requires the hisi_sas v3 driver, an expander connected to 12 high-performance SAS SSDs, heavy interrupt load, and low-privileged local access; the bounded consequence is a CPU soft lockup and service interruption.

The record

CVE
CVE-2024-56589
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
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=4.5
  2. Affected versionversion=47caad1577cd7a39e2048c5e4edbce4b863dc12b <2174bbc235f79fce88ea71fd08cf836568fcad5f
  3. Affected versionversion=47caad1577cd7a39e2048c5e4edbce4b863dc12b <2233c4a0b948211743659b24c13d6bd059fa75fc
  4. Affected versionversion=47caad1577cd7a39e2048c5e4edbce4b863dc12b <2991a023896b79e6753813ed88fbc98979713c73
  5. Affected versionversion=47caad1577cd7a39e2048c5e4edbce4b863dc12b <3dd2c5cb2c698a02a4ed2ea0acb7c9909374a8bf
  6. Affected versionversion=47caad1577cd7a39e2048c5e4edbce4b863dc12b <50ddf4b0e1a4cb5e9ca0aac3d0a73202b903c87f
  7. Affected versionversion=47caad1577cd7a39e2048c5e4edbce4b863dc12b <601f8001373fc3fbad498f9be427254908b7fcce

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=47caad1577cd7a39e2048c5e4edbce4b863dc12b <2174bbc235f79fce88ea71fd08cf836568fcad5f; version=47caad1577cd7a39e2048c5e4edbce4b863dc12b <2233c4a0b948211743659b24c13d6bd059fa75fc; version=47caad1577cd7a39e2048c5e4edbce4b863dc12b <2991a023896b79e6753813ed88fbc98979713c73; version=47caad1577cd7a39e2048c5e4edbce4b863dc12b <3dd2c5cb2c698a02a4ed2ea0acb7c9909374a8bf; version=47caad1577cd7a39e2048c5e4edbce4b863dc12b <50ddf4b0e1a4cb5e9ca0aac3d0a73202b903c87f; version=47caad1577cd7a39e2048c5e4edbce4b863dc12b <601f8001373fc3fbad498f9be427254908b7fcce

Published CVSS scores

5.5CanonicalCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.001OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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