CVE-2024-49974Network attack vector

Remote service interruption via unbounded async COPY

Published Oct 21, 2024 · Updated May 11, 2026

Resource exhaustion in Linux NFSD allows remote attackers to interrupt service through concurrent asynchronous NFSv4 COPY requests. NFSD starts each asynchronous COPY without a concurrency bound, and each operation can process an unlimited sequence of 4 MB chunks. The NFS server and NFSv4 COPY support must be active; sustained requests can consume background-copy capacity and deny service.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux NFSD allows remote attackers to interrupt service through concurrent asynchronous NFSv4 COPY requests. NFSD starts each asynchronous COPY without a concurrency bound, and each operation can process an unlimited sequence of 4 MB chunks. The NFS server and NFSv4 COPY support must be active; sustained requests can consume background-copy capacity and deny service.

The record

CVE
CVE-2024-49974
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 21, 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=4.20
  2. Affected versionversion=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <43e46ee5efc03990b223f7aa8b77aa9c3d3acfdf
  3. Affected versionversion=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <6a488ad7745b8f64625c6d3a24ce7e448e83f11b
  4. Affected versionversion=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <7ea9260874b779637aff6d24c344b8ef4ac862a0
  5. Affected versionversion=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <9e52ff544e0bfa09ee339fd7b0937ee3c080c24e
  6. Affected versionversion=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <aadc3bbea163b6caaaebfdd2b6c4667fbc726752
  7. Affected versionversion=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <ae267989b7b7933dfedcd26468d0a88fc3a9da9e
  8. Affected versionversion=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <b4e21431a0db4854b5023cd5af001be557e6c3db

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <43e46ee5efc03990b223f7aa8b77aa9c3d3acfdf; version=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <6a488ad7745b8f64625c6d3a24ce7e448e83f11b; version=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <7ea9260874b779637aff6d24c344b8ef4ac862a0; version=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <9e52ff544e0bfa09ee339fd7b0937ee3c080c24e; version=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <aadc3bbea163b6caaaebfdd2b6c4667fbc726752; version=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <ae267989b7b7933dfedcd26468d0a88fc3a9da9e; version=e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 <b4e21431a0db4854b5023cd5af001be557e6c3db

Published CVSS scores

7.5Oracle LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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