CVE-2024-57974

UDP service interruption via socket rehash race

Published Feb 27, 2025 · Updated May 11, 2026

Race condition in the Linux kernel UDP stack allows local users to interrupt datagram delivery during socket address changes. The UDP connect path changes the socket address before updating the secondary and four-tuple hashes, so concurrent lookup can miss the socket. Exploitation requires a low-privileged local user to time a later datagram while rehashing is pending, producing transient port-unreachable errors and dropped UDP data rather than a kernel crash.

CVSS severity4.7
Medium
EPSS probability0.14%
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 UDP stack allows local users to interrupt datagram delivery during socket address changes. The UDP connect path changes the socket address before updating the secondary and four-tuple hashes, so concurrent lookup can miss the socket. Exploitation requires a low-privileged local user to time a later datagram while rehashing is pending, producing transient port-unreachable errors and dropped UDP data rather than a kernel crash.

The record

CVE
CVE-2024-57974
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2025CVE 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=2.6.33
  2. Affected versionversion=30fff9231fad757c061285e347b33c5149c2c2e4 <4f8344fce91c5766d368edb0ad80142eacd805c7
  3. Affected versionversion=30fff9231fad757c061285e347b33c5149c2c2e4 <a502ea6fa94b1f7be72a24bcf9e3f5f6b7e6e90c
  4. Affected versionversion=30fff9231fad757c061285e347b33c5149c2c2e4 <d65d3bf309b2649d27b24efd0d8784da2d81f2a6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=30fff9231fad757c061285e347b33c5149c2c2e4 <4f8344fce91c5766d368edb0ad80142eacd805c7; version=30fff9231fad757c061285e347b33c5149c2c2e4 <a502ea6fa94b1f7be72a24bcf9e3f5f6b7e6e90c; version=30fff9231fad757c061285e347b33c5149c2c2e4 <d65d3bf309b2649d27b24efd0d8784da2d81f2a6

Published CVSS scores

4.7National Vulnerability DatabaseCVSS: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 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

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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