CVE-2026-89727Hinoki check available

Host panic via out-of-range GICV_DIR INTID

Published Sep 11, 2026 · Updated Sep 11, 2026

Denial of service in KVM arm64 GICv2 in Linux 6.19 allows guest OS users to panic hosts via an out-of-range GICV_DIR INTID. vgic_v2_deactivate passes the guest-supplied identifier to vgic_get_vcpu_irq and treats its expected NULL result as a WARN_ON_ONCE condition. The path requires an arm64 KVM guest using GICv2 with EOImode enabled, and the host panics only when panic_on_warn is set.

CVSS severityUnavailable
Unscored
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in KVM arm64 GICv2 in Linux 6.19 allows guest OS users to panic hosts via an out-of-range GICV_DIR INTID. vgic_v2_deactivate passes the guest-supplied identifier to vgic_get_vcpu_irq and treats its expected NULL result as a WARN_ON_ONCE condition. The path requires an arm64 KVM guest using GICv2 with EOImode enabled, and the host panics only when panic_on_warn is set.

The record

CVE
CVE-2026-89727
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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?

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  1. Affected versionversion=255de897e7fb918a34845167c572b5bf8e1d9d79 <78b95c571d021391153a5ac7981e9e4d5cc856a3
  2. Affected versionversion=255de897e7fb918a34845167c572b5bf8e1d9d79 <c6d9c8ac6521d3049ec90ac58bebd23ed03ac496
  3. Affected versionversion=6.19

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=255de897e7fb918a34845167c572b5bf8e1d9d79 <78b95c571d021391153a5ac7981e9e4d5cc856a3; version=255de897e7fb918a34845167c572b5bf8e1d9d79 <c6d9c8ac6521d3049ec90ac58bebd23ed03ac496; version=6.19

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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