CVE-2024-41007Network attack vector

Denial of service via excessive TCP retransmissions

Published Jul 15, 2024 · Updated Aug 5, 2026

Denial of service in affected Linux kernel versions beginning with 4.19 allows remote attackers to consume resources through a TCP connection. In net/ipv4/tcp_timer.c, tcp_rtx_probe0_timed_out() ignores icsk_user_timeout, so tcp_retransmit_timer() sends a probe every two jiffies for about four minutes after the configured timeout expires. The target socket must use TCP_USER_TIMEOUT while its peer advertises a zero receive window; the resulting traffic degrades availability without a reported crash or data compromise.

CVSS severity7.5
High
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux kernel versions beginning with 4.19 allows remote attackers to consume resources through a TCP connection. In net/ipv4/tcp_timer.c, tcp_rtx_probe0_timed_out() ignores icsk_user_timeout, so tcp_retransmit_timer() sends a probe every two jiffies for about four minutes after the configured timeout expires. The target socket must use TCP_USER_TIMEOUT while its peer advertises a zero receive window; the resulting traffic degrades availability without a reported crash or data compromise.

The record

CVE
CVE-2024-41007
Published
Jul 15, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 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

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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=4.19
  2. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <04317a2471c2f637b4c49cbd0e9c0d04a519f570
  3. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <5d7e64d70a11d988553a08239c810a658e841982
  4. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <66cb64a1d2239cd0309f9b5038b05462570a5be1
  5. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4
  6. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <97a9063518f198ec0adb2ecb89789de342bb8283
  7. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <d2346fca5bed130dc712f276ac63450201d52969
  8. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <dfcdd7f89e401d2c6616be90c76c2fac3fa98fde
  9. Affected versionversion=b701a99e431db784714c32fc6b68123045714679 <e113cddefa27bbf5a79f72387b8fbd432a61a466

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=b701a99e431db784714c32fc6b68123045714679 <04317a2471c2f637b4c49cbd0e9c0d04a519f570; version=b701a99e431db784714c32fc6b68123045714679 <5d7e64d70a11d988553a08239c810a658e841982; version=b701a99e431db784714c32fc6b68123045714679 <66cb64a1d2239cd0309f9b5038b05462570a5be1; version=b701a99e431db784714c32fc6b68123045714679 <7bb7670f92bfbd05fc41a8f9a8f358b7ffed65f4; version=b701a99e431db784714c32fc6b68123045714679 <97a9063518f198ec0adb2ecb89789de342bb8283; version=b701a99e431db784714c32fc6b68123045714679 <d2346fca5bed130dc712f276ac63450201d52969; version=b701a99e431db784714c32fc6b68123045714679 <dfcdd7f89e401d2c6616be90c76c2fac3fa98fde; version=b701a99e431db784714c32fc6b68123045714679 <e113cddefa27bbf5a79f72387b8fbd432a61a466

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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

T1499.001OS Exhaustion Flood

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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