CVE-2026-98358Network attack vector

Initiator kernel fault via unchecked remote invalidation

Published Oct 6, 2026 · Updated Oct 6, 2026

A NULL-pointer dereference in affected Linux kernels since 4.5 allows remote attackers controlling an iSCSI target to fault an iSER initiator. The iser_check_remote_inv() function trusts a mapped direction and passes its NULL registration descriptor to iser_inv_desc(), which reads desc->sig_protected. The target must send IB_WR_SEND_WITH_INV in response to an immediate-data write; the demonstrated consequence is an initiator kernel fault, not an established full-system panic.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL-pointer dereference in affected Linux kernels since 4.5 allows remote attackers controlling an iSCSI target to fault an iSER initiator. The iser_check_remote_inv() function trusts a mapped direction and passes its NULL registration descriptor to iser_inv_desc(), which reads desc->sig_protected. The target must send IB_WR_SEND_WITH_INV in response to an immediate-data write; the demonstrated consequence is an initiator kernel fault, not an established full-system panic.

The record

CVE
CVE-2026-98358
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=4.5
  2. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <198e4db9add54a50cce60a5d80b8f0ee5456b65a
  3. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <19ddd4af7fce9200e70882f622011e9dd130f427
  4. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <6ed3ebaff3345837f0528d85bd39ce573c7b9a41
  5. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <9d145a2d8d6f8f2cc460b80df41870819048f2a0
  6. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <b4d278c91209931199db9c0836dc2e21a7593dad
  7. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <b9e37452915feaa8422af87dea5d0c16a7d1ff13
  8. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <ceecf3f9c322fc6937a66682942a26ad13a34a07
  9. Affected versionversion=59caaed7a72a0e3750dfb84636dae6b781559310 <d85f0f0a7c85756fc992c70d869706f19dac9259

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=59caaed7a72a0e3750dfb84636dae6b781559310 <198e4db9add54a50cce60a5d80b8f0ee5456b65a; version=59caaed7a72a0e3750dfb84636dae6b781559310 <19ddd4af7fce9200e70882f622011e9dd130f427; version=59caaed7a72a0e3750dfb84636dae6b781559310 <6ed3ebaff3345837f0528d85bd39ce573c7b9a41; version=59caaed7a72a0e3750dfb84636dae6b781559310 <9d145a2d8d6f8f2cc460b80df41870819048f2a0; version=59caaed7a72a0e3750dfb84636dae6b781559310 <b4d278c91209931199db9c0836dc2e21a7593dad; version=59caaed7a72a0e3750dfb84636dae6b781559310 <b9e37452915feaa8422af87dea5d0c16a7d1ff13; version=59caaed7a72a0e3750dfb84636dae6b781559310 <ceecf3f9c322fc6937a66682942a26ad13a34a07; version=59caaed7a72a0e3750dfb84636dae6b781559310 <d85f0f0a7c85756fc992c70d869706f19dac9259

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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