CVE-2026-89913

Unspecified guest-triggered impact via stale LPI dereference

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in Linux KVM arm64 before 6.18.51 and 7.2.5 allows guest OS users to trigger unspecified impact via ITS activity. vgic_v3_save_pending_tables dereferences an LPI returned by an xarray iterator without taking a stable reference, allowing concurrent cache removal to free it after the RCU grace period. Exploitation requires a GICv3 ITS guest to race cached irqfd injection with ITS DISCARD; the published record does not specify the resulting host impact.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Use-after-free in Linux KVM arm64 before 6.18.51 and 7.2.5 allows guest OS users to trigger unspecified impact via ITS activity. vgic_v3_save_pending_tables dereferences an LPI returned by an xarray iterator without taking a stable reference, allowing concurrent cache removal to free it after the RCU grace period. Exploitation requires a GICv3 ITS guest to race cached irqfd injection with ITS DISCARD; the published record does not specify the resulting host impact.

The record

CVE
CVE-2026-89913
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=0 <6.18.51
  2. Affected versionversion=0 <7.2.5
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7631f95297560157d3a9283cb999e3be00103348
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3a2d20b7248ea67465af1cf79c79f90ff70926c
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f5b8f203bfc07a5a257dff859e66d2c500f9f509

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.18.51; version=0 <7.2.5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7631f95297560157d3a9283cb999e3be00103348; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3a2d20b7248ea67465af1cf79c79f90ff70926c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f5b8f203bfc07a5a257dff859e66d2c500f9f509

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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