CVE-2024-56613

Service interruption via NUMA state allocation race

Published Dec 27, 2024 · Updated May 11, 2026

Race condition in Linux kernel 6.4 allows local users to exhaust memory via concurrent NUMA balancing activity. In task_numa_work, concurrent threads can both see a shared VMA's numab_state pointer as NULL, allocate state, and overwrite one allocation without freeing it. Exploitation requires local low-privileged access and a multithreaded workload that races NUMA scan periods; repeated races leak kernel memory and can interrupt service.

CVSS severity5.5
Medium
EPSS probability0.20%
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 Linux kernel 6.4 allows local users to exhaust memory via concurrent NUMA balancing activity. In task_numa_work, concurrent threads can both see a shared VMA's numab_state pointer as NULL, allocate state, and overwrite one allocation without freeing it. Exploitation requires local low-privileged access and a multithreaded workload that races NUMA scan periods; repeated races leak kernel memory and can interrupt service.

The record

CVE
CVE-2024-56613
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
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=6.4
  2. Affected versionversion=ef6a22b70f6d90449a5c797b8968a682824e2011 <5f1b64e9a9b7ee9cfd32c6b2fab796e29bfed075
  3. Affected versionversion=ef6a22b70f6d90449a5c797b8968a682824e2011 <8f149bcc4d91ac92b32ff4949b291e6ed883dc42
  4. Affected versionversion=ef6a22b70f6d90449a5c797b8968a682824e2011 <a71ddd5b87cda687efa28e049e85e923689bcef9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.4; version=ef6a22b70f6d90449a5c797b8968a682824e2011 <5f1b64e9a9b7ee9cfd32c6b2fab796e29bfed075; version=ef6a22b70f6d90449a5c797b8968a682824e2011 <8f149bcc4d91ac92b32ff4949b291e6ed883dc42; version=ef6a22b70f6d90449a5c797b8968a682824e2011 <a71ddd5b87cda687efa28e049e85e923689bcef9

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.5SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
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-401Missing Release of Memory after Effective Lifetime

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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