CVE-2026-98716Hinoki check available

Unspecified impact via incorrect MSR-bitmap selection

Published Oct 18, 2026 · Updated Oct 18, 2026

Incorrect MSR interception in Linux KVM's SVM backend allows guest OS users to cause unspecified impact via nested guest execution. The msr_write_intercepted function selects the nested permission bitmap whenever L2 is active, even when the active VMCB uses a different bitmap. The affected path requires nested SVM execution; the published record and patch do not identify a concrete security consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect MSR interception in Linux KVM's SVM backend allows guest OS users to cause unspecified impact via nested guest execution. The msr_write_intercepted function selects the nested permission bitmap whenever L2 is active, even when the active VMCB uses a different bitmap. The affected path requires nested SVM execution; the published record and patch do not identify a concrete security consequence.

The record

CVE
CVE-2026-98716
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=3.16.57 <3.17
  2. Affected versionversion=4.16
  3. Affected versionversion=4.4.168 <4.5
  4. Affected versionversion=89be8950bab799ddb9cc3777345e3c21bcb32dba
  5. Affected versionversion=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <318ef696fa3c712e46bb62a1a828c3cd62f390c3
  6. Affected versionversion=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <55865b3ae03705aa39198783b9cb1f8b96eb44e4
  7. Affected versionversion=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <74836ae4785b9754bb36d0b18fcc1dec4e5e98d2
  8. Affected versionversion=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <9e06bbb9ade7cdf28d4a3b5b14e5812881c8df85
  9. Affected versionversion=f54d0bb8487d2f016fbc4f0e38ef9098f8eb8bd4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.16.57 <3.17; version=4.16; version=4.4.168 <4.5; version=89be8950bab799ddb9cc3777345e3c21bcb32dba; version=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <318ef696fa3c712e46bb62a1a828c3cd62f390c3; version=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <55865b3ae03705aa39198783b9cb1f8b96eb44e4; version=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <74836ae4785b9754bb36d0b18fcc1dec4e5e98d2; version=b2ac58f90540e39324e7a29a7ad471407ae0bf48 <9e06bbb9ade7cdf28d4a3b5b14e5812881c8df85; version=f54d0bb8487d2f016fbc4f0e38ef9098f8eb8bd4

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.

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

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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