---
id: CVE-2026-74466
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  s390/zcrypt: Close speculative mem read possibility

  The domain value is extracted from a given CCA or EP11 ioctl struct
  when a CPRB is about to be sent
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  s390/zcrypt: Close speculative mem read possibility

  The domain value is extracted from a given CCA or EP11 ioctl struct
  when a CPRB is about to be sent. Thus this is a…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    59adeedebf02aa1c203de1d2b67ec45bfab7a3c6
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    82b62eda68abfb7a33ac40f24b8c4128c2891148
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb
  - Linux 5.18
published: '2026-08-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:17:46.410'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74466'
references:
  - url: 'https://git.kernel.org/stable/c/59adeedebf02aa1c203de1d2b67ec45bfab7a3c6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/82b62eda68abfb7a33ac40f24b8c4128c2891148'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00216
epssPercentile: 0.1121
ingestedAt: '2026-10-15T11:00:41.674Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

s390/zcrypt: Close speculative mem read possibility

The domain value is extracted from a given CCA or EP11 ioctl struct
when a CPRB is about to be sent. Thus this is a user controlled value.
Under some special conditions (custom device node used, administrative
load) this value is used as an array index after bounds checking, but
without speculation barrier.

Add the missing array_index_nospec() call to prevent speculative
execution where this domain value is used.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.