CVE-2026-98432Network attack vectorHinoki check available

Invalid memory access via premature option freeing

Published Oct 15, 2026 · Updated Oct 15, 2026

Use-after-free in Linux IPv4 TCP handling allows remote attackers to trigger invalid kernel memory access via retransmitted SYN packets. inet_sock_destruct() and tcp_v4_reqsk_destructor() free shared options before RCU readers finish, leaving ip_options_build() using freed memory during SYNACK construction. IPv4 options and concurrent socket destruction are required; request migration provides another affected path, but the published record establishes no crash, data disclosure, or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Use-after-free in Linux IPv4 TCP handling allows remote attackers to trigger invalid kernel memory access via retransmitted SYN packets. inet_sock_destruct() and tcp_v4_reqsk_destructor() free shared options before RCU readers finish, leaving ip_options_build() using freed memory during SYNACK construction. IPv4 options and concurrent socket destruction are required; request migration provides another affected path, but the published record establishes no crash, data disclosure, or code execution.

The record

CVE
CVE-2026-98432
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=079096f103faca2dd87342cca6f23d4b34da8871 <11a03ce3c4a62d84c10ccdfe47f8075006498568
  2. Affected versionversion=079096f103faca2dd87342cca6f23d4b34da8871 <26d4c36d318cffbbd160884a0e4cec0da4da4936
  3. Affected versionversion=079096f103faca2dd87342cca6f23d4b34da8871 <a47406c769f72c070386985488f1c4d057df86b2
  4. Affected versionversion=079096f103faca2dd87342cca6f23d4b34da8871 <e3f33b0a1d89d738e2b913dab519226eaf76e15b
  5. Affected versionversion=4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=079096f103faca2dd87342cca6f23d4b34da8871 <11a03ce3c4a62d84c10ccdfe47f8075006498568; version=079096f103faca2dd87342cca6f23d4b34da8871 <26d4c36d318cffbbd160884a0e4cec0da4da4936; version=079096f103faca2dd87342cca6f23d4b34da8871 <a47406c769f72c070386985488f1c4d057df86b2; version=079096f103faca2dd87342cca6f23d4b34da8871 <e3f33b0a1d89d738e2b913dab519226eaf76e15b; version=4.4

Published CVSS scores

No CVSS assessment is available in this record.

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

No sourced classifications are available.

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