---
id: CVE-2026-80709
title: |-
  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 …
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'
cwe:
  - CWE-787
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
published: '2026-08-28'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T20:18:07.747'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80709'
references:
  - url: 'https://git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80709.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80709'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2525466'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80709'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80709'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026082808-CVE-2026-80709-2ca4@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00176
epssPercentile: 0.07048
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:20:33.288089Z'
scores:
  nvd: 7.8
  vendor: 5.5
  cna: 7.8
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.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80709.json)