CVE-2024-56701

Local kernel crash via sleeping allocation under spinlock

Published Dec 28, 2024 · Updated May 11, 2026

Improper locking in the Linux PowerPC pSeries dispatch-log code allows local users to crash a guest through vCPU statistics. vcpudispatch_stats_write holds dtl_access_lock as a spinlock while alloc_dtl_buffers calls the sleeping kmalloc allocator, producing an invalid atomic-context sleep. Reaching the fault requires local access to a PowerPC pSeries guest and writing 1 to /proc/powerpc/vcpudispatch_stats; the reported consequence is availability loss only.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux PowerPC pSeries dispatch-log code allows local users to crash a guest through vCPU statistics. vcpudispatch_stats_write holds dtl_access_lock as a spinlock while alloc_dtl_buffers calls the sleeping kmalloc allocator, producing an invalid atomic-context sleep. Reaching the fault requires local access to a PowerPC pSeries guest and writing 1 to /proc/powerpc/vcpudispatch_stats; the reported consequence is availability loss only.

The record

CVE
CVE-2024-56701
Published
Dec 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 28, 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=06220d78f24a20549757be1014e57c382406cc92 <525e18f1ba7c2b098c8ba587fb397efb34a6574c
  2. Affected versionversion=06220d78f24a20549757be1014e57c382406cc92 <6956c0e7346ce1bbfc726755aa8da10d26e84276
  3. Affected versionversion=06220d78f24a20549757be1014e57c382406cc92 <a246daa26b717e755ccc9061f47f7cd1c0b358dd
  4. Affected versionversion=06220d78f24a20549757be1014e57c382406cc92 <b125d0cf1adde7b2b47d7337fed7e9133eea3463
  5. Affected versionversion=06220d78f24a20549757be1014e57c382406cc92 <cadae3a45d23aa4f6485938a67cbc47aaaa25e38
  6. Affected versionversion=06220d78f24a20549757be1014e57c382406cc92 <f6ec133668757f84e5143f1eb141fd0b83778b9e
  7. Affected versionversion=06220d78f24a20549757be1014e57c382406cc92 <fa5b5ea257135e771b489c83a2e93b5935d0108e
  8. Affected versionversion=5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=06220d78f24a20549757be1014e57c382406cc92 <525e18f1ba7c2b098c8ba587fb397efb34a6574c; version=06220d78f24a20549757be1014e57c382406cc92 <6956c0e7346ce1bbfc726755aa8da10d26e84276; version=06220d78f24a20549757be1014e57c382406cc92 <a246daa26b717e755ccc9061f47f7cd1c0b358dd; version=06220d78f24a20549757be1014e57c382406cc92 <b125d0cf1adde7b2b47d7337fed7e9133eea3463; version=06220d78f24a20549757be1014e57c382406cc92 <cadae3a45d23aa4f6485938a67cbc47aaaa25e38; version=06220d78f24a20549757be1014e57c382406cc92 <f6ec133668757f84e5143f1eb141fd0b83778b9e; version=06220d78f24a20549757be1014e57c382406cc92 <fa5b5ea257135e771b489c83a2e93b5935d0108e; version=5.3

Published CVSS scores

5.5NIST NVDCVSS: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

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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

T1499.004Application 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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