---
id: CVE-2026-80709
title: 's390/zcrypt: Fix wrong domain value verification with EP11 CPRBs'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs

  There is a wrong upper limit check for the domain value when an EP11
  CPRB is processed for sending to …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    4589f742718d0256ea6dd1f5a78be6e689bdb8aa
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    b505dcc8307d64468b463dfad45a03bf865c637e
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    672b12940e3f1336dfed5287412a71500adf2a76
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    1223477ca88e2396eca440919d0ca8754df79bd5
  - >-
    Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 <
    983279d7f86ade73db86f886e09172dd567031b5
  - Linux 5.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:20:33.288089Z'
published: '2026-08-28'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:26:34.515Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80709'
references:
  - url: 'https://git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa'
  - url: 'https://git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e'
  - url: 'https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15'
  - url: 'https://git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76'
  - url: 'https://git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5'
  - url: 'https://git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5'
tags:
  - cve.org
epss: 0.00176
epssPercentile: 0.06647
ingestedAt: '2026-10-16T19:46:24.304Z'
---

## Overview

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

s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs

There is a wrong upper limit check for the domain value when an EP11
CPRB is processed for sending to a crypto card. This check is only
active on custom device nodes but may lead to access heap memory
behind perms->adm when an administrative CPRB is sent.
Add correct limit (AP_DOMAINS = 256) checking to fix this.

## Affected

- `Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 < 4589f742718d0256ea6dd1f5a78be6e689bdb8aa`
- `Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 < b505dcc8307d64468b463dfad45a03bf865c637e`
- `Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 < 13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15`
- `Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 < 672b12940e3f1336dfed5287412a71500adf2a76`
- `Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 < 1223477ca88e2396eca440919d0ca8754df79bd5`
- `Linux >= cfd68b33094e1a92249850ff3c3c92ae9112a541 < 983279d7f86ade73db86f886e09172dd567031b5`
- `Linux 5.18`

## Remediation

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