CVE-2026-80891

Unspecified impact via unsafe guest-page pinning

Published Sep 4, 2026 · Updated Sep 4, 2026

Improper input validation in Linux kernel KVM s390 PCI code allows guest OS users to cause unspecified impact via crafted interrupt metadata. The kvm_s390_pci_aif_enable function pins a single guest page without first rejecting an AIBV that spans pages or an AISB address lacking required eight-byte alignment. Reaching the flaw requires an s390 KVM guest configured for PCI adapter interrupt forwarding; the public advisory does not specify a bounded consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux kernel KVM s390 PCI code allows guest OS users to cause unspecified impact via crafted interrupt metadata. The kvm_s390_pci_aif_enable function pins a single guest page without first rejecting an AIBV that spans pages or an AISB address lacking required eight-byte alignment. Reaching the flaw requires an s390 KVM guest configured for PCI adapter interrupt forwarding; the public advisory does not specify a bounded consequence.

The record

CVE
CVE-2026-80891
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <15df7700dd99f8a37f5c6ed2dcf1e33009cdba47
  2. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48
  3. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <868d32ac72cba21c5c6d8a66a814b7c25a3a5c01
  4. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <b878ba7e28144c9a857bc847d31f3c45413450ac
  5. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <f00ef8efd41440129ccd88f4a1ebebf8d61d297f
  6. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528
  7. Affected versionversion=6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <15df7700dd99f8a37f5c6ed2dcf1e33009cdba47; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <3a1c64220ede4ac9ef9a3e76f008ff60a34f4c48; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <868d32ac72cba21c5c6d8a66a814b7c25a3a5c01; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <b878ba7e28144c9a857bc847d31f3c45413450ac; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <f00ef8efd41440129ccd88f4a1ebebf8d61d297f; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <fbfe683f8b1ae7e40b56bdd6daf5bd671bc3a528; version=6.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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