CVE-2026-89969Network attack vectorHinoki check available

Unauthenticated kernel-memory corruption via oversized NVMe/TCP PDU

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds write in Linux nvmet-tcp allows remote attackers to corrupt kernel memory through a crafted NVMe/TCP PDU. nvmet_tcp_try_recv_pdu calculates a second receive length with a four-byte header digest but never bounds the result against its 128-byte PDU union. The flaw requires negotiated header digests and a second ICReq; the resulting four-byte overwrite corrupts adjacent digest fields.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds write in Linux nvmet-tcp allows remote attackers to corrupt kernel memory through a crafted NVMe/TCP PDU. nvmet_tcp_try_recv_pdu calculates a second receive length with a four-byte header digest but never bounds the result against its 128-byte PDU union. The flaw requires negotiated header digests and a second ICReq; the resulting four-byte overwrite corrupts adjacent digest fields.

The record

CVE
CVE-2026-89969
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.0
  2. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <14cc5a7e77731497d5bea70f3bb05df7eda982e4
  3. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <3a385e0c39efbe34db8edd95900c123113ae3450
  4. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <4f84d42c53c49557fb1ef285c683b0a81b576c74
  5. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <58dc6035b79c4c73c0cbf9ec9f68a7f117b2b3e6
  6. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <a3f0bcfbaf3312a5754d1ce020a07d394669eb25
  7. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <cf5f39d2b58f97e0cd1829c4a6aeef17f1607cca
  8. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <d95d342bc0ea82dc79e6362b2f1f997431750e4c
  9. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <dbc4acbdb3ca8c81441368ad7409b8f77d4de8f6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <14cc5a7e77731497d5bea70f3bb05df7eda982e4; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <3a385e0c39efbe34db8edd95900c123113ae3450; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <4f84d42c53c49557fb1ef285c683b0a81b576c74; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <58dc6035b79c4c73c0cbf9ec9f68a7f117b2b3e6; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <a3f0bcfbaf3312a5754d1ce020a07d394669eb25; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <cf5f39d2b58f97e0cd1829c4a6aeef17f1607cca; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <d95d342bc0ea82dc79e6362b2f1f997431750e4c; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <dbc4acbdb3ca8c81441368ad7409b8f77d4de8f6

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1210Exploitation of Remote Services

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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