CVE-2026-89478Network attack vector

Kernel use-after-free via stale SCTP transport

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in Linux SCTP allows remote authenticated users to access a freed transport via concurrent ASCONF DEL-IP and DATA chunks. Packet processing retains chunk->transport after an address deletion removes and eventually frees that transport, and a delayed SACK reads its state through asoc->peer.last_data_from. Reachability requires an authenticated SCTP peer able to remove an address during packet processing; the source publishes no consequence beyond the stale state read.

CVSS severityUnavailable
Unscored
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux SCTP allows remote authenticated users to access a freed transport via concurrent ASCONF DEL-IP and DATA chunks. Packet processing retains chunk->transport after an address deletion removes and eventually frees that transport, and a delayed SACK reads its state through asoc->peer.last_data_from. Reachability requires an authenticated SCTP peer able to remove an address during packet processing; the source publishes no consequence beyond the stale state read.

The record

CVE
CVE-2026-89478
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <03a9d10ecf71f54b2af8020935f2033d4a132be5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1035bdef1efb9b1076d1a57b81e08c637ff08ecc
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3537961df2163258bddc230db0e18dc14e925ea6
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6c86a5e62a4fec36692ddd64b9144b660f71f96
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <03a9d10ecf71f54b2af8020935f2033d4a132be5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1035bdef1efb9b1076d1a57b81e08c637ff08ecc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3537961df2163258bddc230db0e18dc14e925ea6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c6c86a5e62a4fec36692ddd64b9144b660f71f96; version=2.6.12

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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