CVE-2026-80789Network attack vector

Remote denial of service via unbounded SGL allocation

Published Sep 4, 2026 · Updated Sep 4, 2026

Denial of service in the Linux nvmet-tcp target allows remote attackers to exhaust kernel memory through a crafted write command. nvmet_tcp_map_data() passes an unchecked, host-controlled non-inline SGL length of up to 4 GiB to sgl_alloc() before transfer-length validation. A peer that can reach the target portal and complete a Fabrics connection needs no mandatory default authentication and can leave each allocation resident by withholding the requested data.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Denial of service in the Linux nvmet-tcp target allows remote attackers to exhaust kernel memory through a crafted write command. nvmet_tcp_map_data() passes an unchecked, host-controlled non-inline SGL length of up to 4 GiB to sgl_alloc() before transfer-length validation. A peer that can reach the target portal and complete a Fabrics connection needs no mandatory default authentication and can leave each allocation resident by withholding the requested data.

The record

CVE
CVE-2026-80789
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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 <0952541b153e258b99d39cdb03ea6919fdeb41d0
  3. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <14dbe37681a6a7e346fc147bb363ec7cca3180a0
  4. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22
  5. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <4a3f00262a044e8e15064b1a6860968bf0500bf4
  6. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <6d27199ebe8cb223022150f74be13f154a964474
  7. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <d2acc96c528d589f5827cfb90e8e9229dd9d8cb4
  8. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <d895e66628f939edbb98608f6e033d3d39e6e546
  9. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <f63e89a0310264264923f84406dea05fe752de62
  10. Affected versionversion=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <0952541b153e258b99d39cdb03ea6919fdeb41d0; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <14dbe37681a6a7e346fc147bb363ec7cca3180a0; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <4a3f00262a044e8e15064b1a6860968bf0500bf4; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <6d27199ebe8cb223022150f74be13f154a964474; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <d2acc96c528d589f5827cfb90e8e9229dd9d8cb4; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <d895e66628f939edbb98608f6e033d3d39e6e546; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <f63e89a0310264264923f84406dea05fe752de62; version=872d26a391da92ed8f0c0f5cb5fef428067b7f30 <f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5

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

T1499Endpoint Denial of Service

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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