CVE-2026-98469

Guest termination via unhandled debug-register encoding

Published Oct 18, 2026 · Updated Oct 18, 2026

Incorrect debug-register handling in Linux 6.14 arm64 KVM allows guest OS users to terminate their VM via DBGBXVR access. The demux_wb_reg() dispatcher omits the register's Op2 value of 1, causing the guest access to trigger KVM_BUG_ON() and mark the VM dead. Exposure requires an AArch32 guest on an affected arm64 host; the documented consequence is termination of the accessing VM, not a host crash.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect debug-register handling in Linux 6.14 arm64 KVM allows guest OS users to terminate their VM via DBGBXVR access. The demux_wb_reg() dispatcher omits the register's Op2 value of 1, causing the guest access to trigger KVM_BUG_ON() and mark the VM dead. Exposure requires an AArch32 guest on an affected arm64 host; the documented consequence is termination of the accessing VM, not a host crash.

The record

CVE
CVE-2026-98469
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=3ce9f3357e9e099f02feaa002769eb99ef1138cd <6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d
  2. Affected versionversion=3ce9f3357e9e099f02feaa002769eb99ef1138cd <8530a05b304d312fe7dfbc5df7d3e87cc31b256a
  3. Affected versionversion=3ce9f3357e9e099f02feaa002769eb99ef1138cd <af6813d16ace2765011ca1c567be86ade1d1ee8e
  4. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3ce9f3357e9e099f02feaa002769eb99ef1138cd <6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d; version=3ce9f3357e9e099f02feaa002769eb99ef1138cd <8530a05b304d312fe7dfbc5df7d3e87cc31b256a; version=3ce9f3357e9e099f02feaa002769eb99ef1138cd <af6813d16ace2765011ca1c567be86ade1d1ee8e; version=6.14

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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