s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs (CVE-2026-80709) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80709

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

Answer in brief

CVE-2026-80709 records a Unknown severity vulnerability in s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=cfd68b33094e1a92249850ff3c3c92ae9112a541 <4589f742718d0256ea6dd1f5a78be6e689bdb8aa \|\| >=cfd68b33094e1a92249850ff3c3c92ae9112a541 <b505dcc8307d64468b463dfad45a03bf865c637e \|\| >=cfd68b33094e1a92249850ff3c3c92ae9112a541 <13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15 \|\| >=cfd68b33094e1a92249850ff3c3c92ae9112a541 <672b12940e3f1336dfed5287412a71500adf2a76 \|\| >=cfd68b33094e1a92249850ff3c3c92ae9112a541 <1223477ca88e2396eca440919d0ca8754df79bd5 \|\| >=cfd68b33094e1a92249850ff3c3c92ae9112a541 <983279d7f86ade73db86f886e09172dd567031b5	4589f742718d0256ea6dd1f5a78be6e689bdb8aa, b505dcc8307d64468b463dfad45a03bf865c637e, 13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15, 672b12940e3f1336dfed5287412a71500adf2a76, 1223477ca88e2396eca440919d0ca8754df79bd5, 983279d7f86ade73db86f886e09172dd567031b5
Linux/Linuxgeneric	5.18	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 4589f742718d0256ea6dd1f5a78be6e689bdb8aa if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.