CVE-2024-53123

System crash via MPTCP disconnect race

Published Dec 2, 2024 · Updated May 23, 2026

A race condition in the Linux kernel MPTCP receive path allows local users to crash the system by racing a socket disconnect. In mptcp_recvmsg, an error from sk_wait_data can leave the disconnected socket with rcv_mss set to zero, yet processing continues into __tcp_select_window and divides by that value. Exploitation requires low-privileged local access and an MPTCP socket; the demonstrated consequence is a kernel divide-error crash.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in the Linux kernel MPTCP receive path allows local users to crash the system by racing a socket disconnect. In mptcp_recvmsg, an error from sk_wait_data can leave the disconnected socket with rcv_mss set to zero, yet processing continues into __tcp_select_window and divides by that value. Exploitation requires low-privileged local access and an MPTCP socket; the demonstrated consequence is a kernel divide-error crash.

The record

CVE
CVE-2024-53123
Published
Dec 2, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 2, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=30fa7600e0580cabbbc50e1c94b5609a85469809
  2. Affected versionversion=419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2 <581302298524e9d77c4c44ff5156a6cd112227ae
  3. Affected versionversion=419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2 <955388e1d5d222c4101c596b536d41b91a8b212e
  4. Affected versionversion=419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2 <a66805c9b22caf4e42af7a616f6c6b83c90d1010
  5. Affected versionversion=6.1.60 <6.1.119
  6. Affected versionversion=6.5.9 <6.6
  7. Affected versionversion=6.6
  8. Affected versionversion=ec9bc89a018842006d63f6545c50768e79bd89f8 <a749b23059b43a9b1787eb36c5d9d44150a34238

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=30fa7600e0580cabbbc50e1c94b5609a85469809; version=419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2 <581302298524e9d77c4c44ff5156a6cd112227ae; version=419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2 <955388e1d5d222c4101c596b536d41b91a8b212e; version=419ce133ab928ab5efd7b50b2ef36ddfd4eadbd2 <a66805c9b22caf4e42af7a616f6c6b83c90d1010; version=6.1.60 <6.1.119; version=6.5.9 <6.6; version=6.6; version=ec9bc89a018842006d63f6545c50768e79bd89f8 <a749b23059b43a9b1787eb36c5d9d44150a34238

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISACVSS: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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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