CVE-2026-98635Hinoki check available

Kernel memory corruption via unchecked zone-report index

Published Oct 18, 2026 · Updated Oct 18, 2026

An out-of-bounds write in Linux 6.19 zone revalidation allows attackers to corrupt kernel memory through device zone reports. blk_revalidate_zone_cond() passes an unchecked report index to blk_zone_set_cond(); truncating a zone count above 32 bits also undersizes the zones_cond array. Triggering requires a zoned device reporting more zones than the array holds; privilege escalation and a specific crash outcome are not established.

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

An out-of-bounds write in Linux 6.19 zone revalidation allows attackers to corrupt kernel memory through device zone reports. blk_revalidate_zone_cond() passes an unchecked report index to blk_zone_set_cond(); truncating a zone count above 32 bits also undersizes the zones_cond array. Triggering requires a zoned device reporting more zones than the array holds; privilege escalation and a specific crash outcome are not established.

The record

CVE
CVE-2026-98635
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
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=6.19
  2. Affected versionversion=6e945ffb6555705cf20b1fcdc21a139911562995 <7c431d61b69a3fd0784c20aa4cd0b8fb501b5653
  3. Affected versionversion=6e945ffb6555705cf20b1fcdc21a139911562995 <ca688bb207957cffa5a8cad207329b0dcac1f2c0

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=6e945ffb6555705cf20b1fcdc21a139911562995 <7c431d61b69a3fd0784c20aa4cd0b8fb501b5653; version=6e945ffb6555705cf20b1fcdc21a139911562995 <ca688bb207957cffa5a8cad207329b0dcac1f2c0

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)
VectorUnavailable
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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