CVE-2024-45009Network attack vector

Remote service interruption via MPTCP counter underflow

Published Sep 11, 2024 · Updated Aug 5, 2026

Affected Linux kernel versions allow remote attackers to exhaust host resources through crafted MPTCP RM_ADDR messages. The MPTCP path manager decrements add_addr_accepted when removing a subflow not created from ADD_ADDR, wrapping the counter and re-enabling address acceptance. MPTCP must be enabled and reachable; repeated MP_JOIN and RM_ADDR exchanges bypass address limits and force unbounded subflow and socket creation.

CVSS severity8.2
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Affected Linux kernel versions allow remote attackers to exhaust host resources through crafted MPTCP RM_ADDR messages. The MPTCP path manager decrements add_addr_accepted when removing a subflow not created from ADD_ADDR, wrapping the counter and re-enabling address acceptance. MPTCP must be enabled and reachable; repeated MP_JOIN and RM_ADDR exchanges bypass address limits and force unbounded subflow and socket creation.

The record

CVE
CVE-2024-45009
Published
Sep 11, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.10
  2. Affected versionversion=d0876b2284cf8b34dd214b2d0aa21071c345da59 <1c1f721375989579e46741f59523e39ec9b2a9bd
  3. Affected versionversion=d0876b2284cf8b34dd214b2d0aa21071c345da59 <2060f1efab370b496c4903b840844ecaff324c3c
  4. Affected versionversion=d0876b2284cf8b34dd214b2d0aa21071c345da59 <35b31f5549ede4070566b949781e83495906b43d
  5. Affected versionversion=d0876b2284cf8b34dd214b2d0aa21071c345da59 <85b866e4c4e63a1d7afb58f1e24273caad03d0b7
  6. Affected versionversion=d0876b2284cf8b34dd214b2d0aa21071c345da59 <d20bf2c96d7ffd171299b32f562f70e5bf5dc608

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=d0876b2284cf8b34dd214b2d0aa21071c345da59 <1c1f721375989579e46741f59523e39ec9b2a9bd; version=d0876b2284cf8b34dd214b2d0aa21071c345da59 <2060f1efab370b496c4903b840844ecaff324c3c; version=d0876b2284cf8b34dd214b2d0aa21071c345da59 <35b31f5549ede4070566b949781e83495906b43d; version=d0876b2284cf8b34dd214b2d0aa21071c345da59 <85b866e4c4e63a1d7afb58f1e24273caad03d0b7; version=d0876b2284cf8b34dd214b2d0aa21071c345da59 <d20bf2c96d7ffd171299b32f562f70e5bf5dc608

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.2kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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