CVE-2022-32296Public exploitNetwork attack vector

Client fingerprinting via predictable TCP source ports

Published Jun 5, 2022 · Updated Aug 3, 2024

Information disclosure in the Linux kernel allows remote attackers to fingerprint clients through observable TCP source-port patterns. The IPv4 connection code uses an undersized table_perturb array, allowing repeated connections to reveal persistent hash collisions as a stable device identifier. Exploitation requires induced outbound connections to an observing server; source-port-rewriting NAT or forward proxies prevent tracking, and the identifier lasts until reboot.

CVSS severity3.3
Low
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel allows remote attackers to fingerprint clients through observable TCP source-port patterns. The IPv4 connection code uses an undersized table_perturb array, allowing repeated connections to reveal persistent hash collisions as a stable device identifier. Exploitation requires induced outbound connections to an observing server; source-port-rewriting NAT or forward proxies prevent tracking, and the identifier lasts until reboot.

The record

CVE
CVE-2022-32296
Published
Jun 5, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-330
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.1NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
3.3NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values

Public exploit references

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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