CVE-2026-98713Hinoki check available

Host warning via omitted instruction trap entries

Published Oct 18, 2026 · Updated Oct 18, 2026

Trap handling in Linux arm64 KVM allows guest OS users to trigger a host kernel warning by executing a hidden TLBI OS instruction. populate_nv_trap_config() omits fine-grained UNDEF entries without FEAT_FGT, sending the trapped instruction to handle_tlbi_el1() instead of rejecting it early. The trigger requires execution at guest vEL1 with FEAT_TLBIOS hidden on hardware lacking FEAT_FGT; the documented consequence is a warning, not a demonstrated crash or privilege escalation.

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

Trap handling in Linux arm64 KVM allows guest OS users to trigger a host kernel warning by executing a hidden TLBI OS instruction. populate_nv_trap_config() omits fine-grained UNDEF entries without FEAT_FGT, sending the trapped instruction to handle_tlbi_el1() instead of rejecting it early. The trigger requires execution at guest vEL1 with FEAT_TLBIOS hidden on hardware lacking FEAT_FGT; the documented consequence is a warning, not a demonstrated crash or privilege escalation.

The record

CVE
CVE-2026-98713
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

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=6.9
  2. Affected versionversion=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087
  3. Affected versionversion=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <2f4a15c52a552c5244ec27f4ca8bda855594f918
  4. Affected versionversion=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07
  5. Affected versionversion=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <af3300b3a6bace925a496f3520e171c07b999c72

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087; version=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <2f4a15c52a552c5244ec27f4ca8bda855594f918; version=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07; version=f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f <af3300b3a6bace925a496f3520e171c07b999c72

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
Privilegesauthenticated
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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