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Linux Kernel zcrypt EUVDEUVD-2026-67444

| CVE-2026-80709 HIGH
2026-08-28 Linux GHSA-w33j-vhfx-hgqc
Information Disclosure Linux Red Hat Suse
7.8
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.3 HIGH

AV:L (local device node access required), PR:L (low privilege needed); I:L not I:H because description confirms heap read, not confirmed arbitrary write.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 08:08 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
7.8 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:53 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 28, 2026 - 06:53 cve.org
HIGH 7.8

DescriptionCVE.org

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.

AnalysisAI

Heap out-of-bounds memory access in the Linux kernel s390/zcrypt subsystem exposes EP11 crypto card administrative paths to local low-privileged users. The flaw resides in the domain value upper-limit check processed when sending EP11 CPRBs (Control Program Request Blocks) through custom zcrypt device nodes - the missing AP_DOMAINS (256) ceiling allows an attacker-supplied domain index to reach heap memory beyond the perms->adm structure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Vulnerability AssessmentAI

Exploitation Exploitation requires all of the following: the host system must run on s390/IBM Z architecture (AV:L confirmed); a custom zcrypt device node must exist and be accessible to the attacker - standard /dev/z90crypt nodes are not affected; the attacker must hold at least low-privilege local access to submit an EP11 administrative CPRB (PR:L from CVSS vector); and an EP11-capable CEX crypto adapter must be present. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 7.8 score (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a local, low-complexity exploit with full CIA impact - consistent with heap corruption primitives that can expose cryptographic key material (C:H) and destabilize kernel memory (I:H, A:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to a patched Linux kernel stable release: 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, or 7.2. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify and inventory all Linux systems running on s390 architecture with zcrypt cryptographic hardware attached, prioritizing production systems. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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EUVD-2026-67444 vulnerability details – vuln.today
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