CVE-2026-99165Network attack vector

Kernel crash via stale SCTP stream validation

Published Oct 28, 2026 · Updated Oct 28, 2026

NULL dereference in Linux SCTP allows remote attackers to trigger a kernel oops through stream negotiation during an interleaved send. The send path resumes after socket-lock-dropping waits without revalidating the selected stream and its extension, allowing sctp_outq_tail() to dereference a NULL extension after peer-driven stream removal. Message interleaving and a concurrent send are required; fatal-oops policies turn the fault into a host panic.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL dereference in Linux SCTP allows remote attackers to trigger a kernel oops through stream negotiation during an interleaved send. The send path resumes after socket-lock-dropping waits without revalidating the selected stream and its extension, allowing sctp_outq_tail() to dereference a NULL extension after peer-driven stream removal. Message interleaving and a concurrent send are required; fatal-oops policies turn the fault into a host panic.

The record

CVE
CVE-2026-99165
Published
Oct 28, 2026
Updated
Oct 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=4.16
  2. Affected versionversion=668c9beb9020d5834ee9e43c208190a07d2b1928 <77a63d1b813b08c4e5a948f5e04fbaca6176aa8f
  3. Affected versionversion=668c9beb9020d5834ee9e43c208190a07d2b1928 <b7ad72414c673ce1fa1f463e807cd4f34f8be9bf
  4. Affected versionversion=668c9beb9020d5834ee9e43c208190a07d2b1928 <fd56ac95ec31a05b66e8938debfa847f49c0e993

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=668c9beb9020d5834ee9e43c208190a07d2b1928 <77a63d1b813b08c4e5a948f5e04fbaca6176aa8f; version=668c9beb9020d5834ee9e43c208190a07d2b1928 <b7ad72414c673ce1fa1f463e807cd4f34f8be9bf; version=668c9beb9020d5834ee9e43c208190a07d2b1928 <fd56ac95ec31a05b66e8938debfa847f49c0e993

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
PrivilegesUnavailable
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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