CVE-2026-90110Network attack vector

UDP port inference via predictable inetpeer eviction

Published Sep 17, 2026 · Updated Sep 18, 2026

Information disclosure in the Linux kernel allows remote attackers to infer open UDP ports through an ICMP rate-limit side channel. inetpeer_addr_cmp orders peer nodes by raw IP address, making tree traversal predictable so forced garbage collection can evict a chosen node and reset its token bucket. Exploitation requires off-path packet traffic sufficient to exceed inet_peer_threshold; the bounded result is UDP port-state inference, not packet-content disclosure.

CVSS severity3.7
Low
EPSS probability0.61%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Information disclosure in the Linux kernel allows remote attackers to infer open UDP ports through an ICMP rate-limit side channel. inetpeer_addr_cmp orders peer nodes by raw IP address, making tree traversal predictable so forced garbage collection can evict a chosen node and reset its token bucket. Exploitation requires off-path packet traffic sufficient to exceed inet_peer_threshold; the bounded result is UDP port-state inference, not packet-content disclosure.

The record

CVE
CVE-2026-90110
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1046
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=4.14
  2. Affected versionversion=b145425f269a17ed344d737f746b844dfac60c82 <199fcf285e498111e029137d088949bc6c26d578
  3. Affected versionversion=b145425f269a17ed344d737f746b844dfac60c82 <2ee66e9487172fcd189bc52a767c30dad7141c09
  4. Affected versionversion=b145425f269a17ed344d737f746b844dfac60c82 <5f127e3cc9647a8a70db12c65dbd0de473545380
  5. Affected versionversion=b145425f269a17ed344d737f746b844dfac60c82 <7109bb63667a53e4542ad845476f97d0c8b28a61
  6. Affected versionversion=b145425f269a17ed344d737f746b844dfac60c82 <857681f6835d5b0a7bc4a34a026baeaaf5215623
  7. Affected versionversion=b145425f269a17ed344d737f746b844dfac60c82 <b20e98f0bb668a59abaf7bcf85d75c073e90d352

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=b145425f269a17ed344d737f746b844dfac60c82 <199fcf285e498111e029137d088949bc6c26d578; version=b145425f269a17ed344d737f746b844dfac60c82 <2ee66e9487172fcd189bc52a767c30dad7141c09; version=b145425f269a17ed344d737f746b844dfac60c82 <5f127e3cc9647a8a70db12c65dbd0de473545380; version=b145425f269a17ed344d737f746b844dfac60c82 <7109bb63667a53e4542ad845476f97d0c8b28a61; version=b145425f269a17ed344d737f746b844dfac60c82 <857681f6835d5b0a7bc4a34a026baeaaf5215623; version=b145425f269a17ed344d737f746b844dfac60c82 <b20e98f0bb668a59abaf7bcf85d75c073e90d352

Published CVSS scores

3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1046Network Service Discovery

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

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started