CVE-2022-49330Network attack vector

Host crash via TCP congestion-window zero divide

Published Feb 26, 2025 · Updated Aug 5, 2026

Denial of service in affected Linux kernel builds allows remote attackers to crash a host via TCP MTU probing during established connections. tcp_mtup_probe checks snd_cwnd before starting a probe, but tcp_mtup_probe_success later recalculates it after congestion has reduced the window, allowing a zero value used by congestion-control division. A peer must drive a data-heavy TCP connection, induce loss after a probe starts, and acknowledge the probe; the documented consequence is host interruption without data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.83%
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 builds allows remote attackers to crash a host via TCP MTU probing during established connections. tcp_mtup_probe checks snd_cwnd before starting a probe, but tcp_mtup_probe_success later recalculates it after congestion has reduced the window, allowing a zero value used by congestion-control division. A peer must drive a data-heavy TCP connection, induce loss after a probe starts, and acknowledge the probe; the documented consequence is host interruption without data disclosure or modification.

The record

CVE
CVE-2022-49330
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE 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=2.6.17
  2. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <11825765291a93d8e7f44230da67b9f607c777bf
  3. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <29e13f6b38f0816af2012e0725507754e8f4569c
  4. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <38ca71a24cd4845021eed35fd2594d89dba9a5a8
  5. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <42726877453afdbe1508a8a96884ea907741d9a7
  6. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <602b338e3c3cd7f935f3f5011882961d074e5ac1
  7. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <90385f2b65d0cd2b3b1ac8909f0cc6dd31062cfc
  8. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <9ba2b4ac35935f05ac98cff722f36ba07d62270e
  9. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <aa7f333efd1138a68517a6a6a69ae540dd59d800
  10. Affected versionversion=5d424d5a674f782d0659a3b66d951f412901faee <f2845e1504a3bc4f3381394f057e8b63cb5f3f7a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.17; version=5d424d5a674f782d0659a3b66d951f412901faee <11825765291a93d8e7f44230da67b9f607c777bf; version=5d424d5a674f782d0659a3b66d951f412901faee <29e13f6b38f0816af2012e0725507754e8f4569c; version=5d424d5a674f782d0659a3b66d951f412901faee <38ca71a24cd4845021eed35fd2594d89dba9a5a8; version=5d424d5a674f782d0659a3b66d951f412901faee <42726877453afdbe1508a8a96884ea907741d9a7; version=5d424d5a674f782d0659a3b66d951f412901faee <602b338e3c3cd7f935f3f5011882961d074e5ac1; version=5d424d5a674f782d0659a3b66d951f412901faee <90385f2b65d0cd2b3b1ac8909f0cc6dd31062cfc; version=5d424d5a674f782d0659a3b66d951f412901faee <9ba2b4ac35935f05ac98cff722f36ba07d62270e; version=5d424d5a674f782d0659a3b66d951f412901faee <aa7f333efd1138a68517a6a6a69ae540dd59d800; version=5d424d5a674f782d0659a3b66d951f412901faee <f2845e1504a3bc4f3381394f057e8b63cb5f3f7a

Published CVSS scores

7.5LinuxCVSS: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

T1499.004Application 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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