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Linux Kernel CVE-2026-80684

| EUVDEUVD-2026-67560 CRITICAL
2026-08-28 Linux GHSA-q4fh-xh4r-x3xp
Information Disclosure Linux Red Hat Suse
Critical
Disputed · 9.3 Vendor: Linux
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Severity by source

Sources disagree (Medium–Critical)
Vendor (Linux) PRIMARY
9.3 CRITICAL
AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
4.7 MEDIUM

Local s390 KVM path (AV:L), depends on an unforced allocation failure (AC:H), needs privilege to run zPCI passthrough (PR:L); NULL deref causes only a host crash, so C:N/I:N/A:H.

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

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: Linux

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

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 08:00 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
9.3 (CRITICAL)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:52 cve.org
CRITICAL 9.3
CVE Published
Aug 28, 2026 - 06:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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

KVM: s390: pci: Fix NULL dereference on AIBV allocation failure

The airq_iv_create() can return NULL on failure, but the return value was never checked. If it fails, zdev->aibv will be NULL and fail when dereferenced in kvm_zpci_set_airq(). Add a NULL check and free the previously allocated AISB bit and zdev->aisb on failure.

AnalysisAI

Denial-of-service in the Linux kernel's KVM subsystem on IBM Z (s390) mainframes stems from an unchecked airq_iv_create() return value in the zPCI adaptive-interrupt path. When AIBV allocation fails, zdev->aibv is left NULL and later dereferenced in kvm_zpci_set_airq(), crashing the host kernel. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an s390 (IBM Z) host running KVM with zPCI device passthrough configured for a guest, and it only triggers when airq_iv_create() fails to allocate the AIBV - i.e. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H = 9.3) substantially overstates real-world risk and internally conflicts with the described defect: a NULL pointer dereference yields a kernel crash (availability impact), not the confidentiality/integrity compromise the C:H/I:H claims - and the 'Information Disclosure' tag is likewise unsupported by the description. … 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 Vendor-released patch: upgrade to a fixed stable kernel - 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, or 7.2, whichever matches your release branch - and reboot into the patched kernel. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Linux systems running KVM on IBM Z (s390) architecture and confirm their current kernel versions. …

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Vendor StatusVendor

SUSE

Severity: Important
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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CVE-2026-80684 vulnerability details – vuln.today
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