CVE-2026-74557Network attack vector

Kernel data disclosure via truncated iSCSI response

Published Aug 15, 2026 · Updated Aug 15, 2026

Information disclosure in the Linux kernel's libiscsi SCSI response handler allows remote attackers to expose stale kernel data via iSCSI. iscsi_scsi_cmd_rsp() checks the data-segment length against the declared sense length without adding its two-byte prefix, then memcpy() reads up to two bytes beyond the received segment. The attacker must control a target on an established iSCSI session; repeated responses place stale conn->data bytes in sense buffers returned to userspace without modifying data or interrupting service.

CVSS severity7.5
High
EPSS probability0.33%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel's libiscsi SCSI response handler allows remote attackers to expose stale kernel data via iSCSI. iscsi_scsi_cmd_rsp() checks the data-segment length against the declared sense length without adding its two-byte prefix, then memcpy() reads up to two bytes beyond the received segment. The attacker must control a target on an established iSCSI session; repeated responses place stale conn->data bytes in sense buffers returned to userspace without modifying data or interrupting service.

The record

CVE
CVE-2026-74557
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.18
  2. Affected versionversion=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <1f07a897d43c63e6c9458bf77450defef39b5833
  3. Affected versionversion=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <3ef209ca0b4b68c75e9a814d90cc916026b5a6ac
  4. Affected versionversion=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <60499924faf4ef97e84228c20515218ef121facf
  5. Affected versionversion=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <7567f06abdefb1caf2d836107c4d08c5185c650e
  6. Affected versionversion=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <98b87885de4b7f605533a2860685f5689fce8e82

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.18; version=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <1f07a897d43c63e6c9458bf77450defef39b5833; version=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <3ef209ca0b4b68c75e9a814d90cc916026b5a6ac; version=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <60499924faf4ef97e84228c20515218ef121facf; version=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <7567f06abdefb1caf2d836107c4d08c5185c650e; version=7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 <98b87885de4b7f605533a2860685f5689fce8e82

Published CVSS scores

7.5Linux CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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