CVE-2022-1012Public exploitNetwork attack vector

Device tracking via predictable TCP source ports

Published Aug 5, 2022 · Updated Aug 2, 2024

Information disclosure in Linux Kernel 5.12-rc1 through 5.18-rc5 allows remote attackers to track devices via TCP source ports. __inet_hash_connect() maps destination tuples into a 256-entry shared perturbation table, making hash collisions observable through chosen outbound connections. Exploitation requires inducing many direct outbound connections and observing their source ports; successful tracking persists until reboot and can cross browsers, containers, and some network boundaries.

CVSS severity8.2
High
EPSS probability3.86%
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 Linux Kernel 5.12-rc1 through 5.18-rc5 allows remote attackers to track devices via TCP source ports. __inet_hash_connect() maps destination tuples into a 256-entry shared perturbation table, making hash collisions observable through chosen outbound connections. Exploitation requires inducing many direct outbound connections and observing their source ports; successful tracking persists until reboot and can cross browsers, containers, and some network boundaries.

The record

CVE
CVE-2022-1012
Published
Aug 5, 2022
Updated
Aug 2, 2024
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

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

  1. Affected versionversion=Linux kernel version prior to 5.18-rc6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Linux kernel version prior to 5.18-rc6

Published CVSS scores

8.2NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
8.2Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

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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