CVE-2026-99153Network attack vector

Crash or false I/O completion via unchecked ITT

Published Oct 28, 2026 · Updated Oct 28, 2026

Task-validation failure in Linux libiscsi allows remote attackers to crash the kernel or falsely complete I/O via crafted Reject PDUs. iscsi_handle_reject() uses the reflected initiator task tag (ITT) to select a pool entry without validating its identity, state, or command type. Exploitation requires control of target responses in an established iSCSI session; an unused entry triggers a null-pointer dereference, while an active read can report success without filling its buffer.

CVSS severityUnavailable
Unscored
EPSS probability0.55%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Task-validation failure in Linux libiscsi allows remote attackers to crash the kernel or falsely complete I/O via crafted Reject PDUs. iscsi_handle_reject() uses the reflected initiator task tag (ITT) to select a pool entry without validating its identity, state, or command type. Exploitation requires control of target responses in an established iSCSI session; an unused entry triggers a null-pointer dereference, while an active read can report success without filling its buffer.

The record

CVE
CVE-2026-99153
Published
Oct 28, 2026
Updated
Oct 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=2.6.32
  2. Affected versionversion=8afa1439fcff58da8f28c1d083046f229f6ab3de <7215a69b6456fda79c0935c2959045dff3fcaac8
  3. Affected versionversion=8afa1439fcff58da8f28c1d083046f229f6ab3de <c5958c770b2a0ee492414e26b07da9164a0d1f5d
  4. Affected versionversion=8afa1439fcff58da8f28c1d083046f229f6ab3de <d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.32; version=8afa1439fcff58da8f28c1d083046f229f6ab3de <7215a69b6456fda79c0935c2959045dff3fcaac8; version=8afa1439fcff58da8f28c1d083046f229f6ab3de <c5958c770b2a0ee492414e26b07da9164a0d1f5d; version=8afa1439fcff58da8f28c1d083046f229f6ab3de <d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a

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

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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