CVE-2026-89479Network attack vector

Remote kernel memory corruption via bundled SCTP chunks

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in the Linux kernel SCTP endpoint receive path allows remote attackers to corrupt kernel memory with a crafted packet. In sctp_endpoint_bh_rcv(), cached association and transport pointers remain unreferenced after sctp_sf_do_9_2_final() deletes them, so a later bundled chunk writes through the freed transport and enters sctp_do_sm() with the freed association. The packet must reach the socket backlog in task context and bundle COOKIE ECHO, SHUTDOWN, SHUTDOWN ACK, and another chunk.

CVSS severityUnavailable
Unscored
EPSS probability0.51%
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 the Linux kernel SCTP endpoint receive path allows remote attackers to corrupt kernel memory with a crafted packet. In sctp_endpoint_bh_rcv(), cached association and transport pointers remain unreferenced after sctp_sf_do_9_2_final() deletes them, so a later bundled chunk writes through the freed transport and enters sctp_do_sm() with the freed association. The packet must reach the socket backlog in task context and bundle COOKIE ECHO, SHUTDOWN, SHUTDOWN ACK, and another chunk.

The record

CVE
CVE-2026-89479
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

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?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47e15a8d12e366d0d261bcbc394394f44418938d
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a713e1b3a265f180ad25a08e17be15d67a2f7149
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee3f04cf566f6041aa9a0360494fd8db5ade383a
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fa306a40e716c5abcd967475459ce1ebd56e5115
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47e15a8d12e366d0d261bcbc394394f44418938d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a713e1b3a265f180ad25a08e17be15d67a2f7149; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee3f04cf566f6041aa9a0360494fd8db5ade383a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fa306a40e716c5abcd967475459ce1ebd56e5115; 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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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