CVE-2026-89481Network attack vector

Kernel memory disclosure via misdirected R2T handling

Published Sep 11, 2026 · Updated Sep 11, 2026

Information disclosure in the Linux NVMe/TCP host driver allows remote attackers controlling a storage controller to read stale kernel memory. nvme_tcp_handle_r2t() accepts an R2T for a read, after which nvme_tcp_setup_h2c_data_pdu() and nvme_tcp_try_send_data() transmit the read destination buffer. Exploitation requires the host to issue a read to an attacker-controlled NVMe/TCP controller; the controller receives prior kernel contents without a host log.

CVSS severityUnavailable
Unscored
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux NVMe/TCP host driver allows remote attackers controlling a storage controller to read stale kernel memory. nvme_tcp_handle_r2t() accepts an R2T for a read, after which nvme_tcp_setup_h2c_data_pdu() and nvme_tcp_try_send_data() transmit the read destination buffer. Exploitation requires the host to issue a read to an attacker-controlled NVMe/TCP controller; the controller receives prior kernel contents without a host log.

The record

CVE
CVE-2026-89481
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1048
Attack vector
network
Privileges
Unavailable

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=3f2304f8c6d6ed97849057bd16fee99e434ca796 <3a0b05145053a5fad1a2ddb4e4d87b07385e63e5
  2. Affected versionversion=3f2304f8c6d6ed97849057bd16fee99e434ca796 <3b3d27670c0c890ba7cf1bc3614cab61bde6d25c
  3. Affected versionversion=3f2304f8c6d6ed97849057bd16fee99e434ca796 <6efbc52237facda35d2d874fe1765bb4839275d8
  4. Affected versionversion=3f2304f8c6d6ed97849057bd16fee99e434ca796 <a4c3c7310156493797c920b10d8648c07aa05403
  5. Affected versionversion=5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3f2304f8c6d6ed97849057bd16fee99e434ca796 <3a0b05145053a5fad1a2ddb4e4d87b07385e63e5; version=3f2304f8c6d6ed97849057bd16fee99e434ca796 <3b3d27670c0c890ba7cf1bc3614cab61bde6d25c; version=3f2304f8c6d6ed97849057bd16fee99e434ca796 <6efbc52237facda35d2d874fe1765bb4839275d8; version=3f2304f8c6d6ed97849057bd16fee99e434ca796 <a4c3c7310156493797c920b10d8648c07aa05403; version=5.0

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

Weakness, pattern, technique

T1048Exfiltration Over Alternative Protocol

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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