CVE-2026-97906Hinoki check available

Early-boot crash via bootconfig size wraparound

Published Sep 25, 2026 · Updated Sep 25, 2026

Integer overflow in Linux bootconfig parsing allows attackers to crash the kernel during early boot via a crafted initrd. The get_boot_config_from_initrd() function subtracts an unbounded footer size before validating it, so wraparound bypasses the initrd_start check and xbc_calc_checksum() reads unmapped memory. Exploitation requires control of the initrd supplied at boot; the bounded consequence is a fatal kernel page fault.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integer overflow in Linux bootconfig parsing allows attackers to crash the kernel during early boot via a crafted initrd. The get_boot_config_from_initrd() function subtracts an unbounded footer size before validating it, so wraparound bypasses the initrd_start check and xbc_calc_checksum() reads unmapped memory. Exploitation requires control of the initrd supplied at boot; the bounded consequence is a fatal kernel page fault.

The record

CVE
CVE-2026-97906
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=32394df25d8e46935b442b429d74b37885c4f092
  2. Affected versionversion=5.6.14 <5.7
  3. Affected versionversion=5.7
  4. Affected versionversion=de462e5f10718517bacf2f84c8aa2804567ef7df <7812d6dab0698001e50e8c2f901e17da3eb6f429
  5. Affected versionversion=de462e5f10718517bacf2f84c8aa2804567ef7df <8d4343a411eaa182d323ab5b149496416015f27d
  6. Affected versionversion=de462e5f10718517bacf2f84c8aa2804567ef7df <bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=32394df25d8e46935b442b429d74b37885c4f092; version=5.6.14 <5.7; version=5.7; version=de462e5f10718517bacf2f84c8aa2804567ef7df <7812d6dab0698001e50e8c2f901e17da3eb6f429; version=de462e5f10718517bacf2f84c8aa2804567ef7df <8d4343a411eaa182d323ab5b149496416015f27d; version=de462e5f10718517bacf2f84c8aa2804567ef7df <bff9a1579e2c9b2a59fdf3793becc9d7bf5ff1a6

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

T1499Endpoint Denial of Service

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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