CVE-2023-53699

Boot failure via premature memblock array resizing

Published Oct 22, 2025 · Updated Oct 22, 2025

Denial of service in affected RISC-V Linux kernels causes a boot-time page fault when numerous memory regions are reserved. Before the linear mapping is ready, memblock_double_array reallocates the reserved-regions array and copies data from the kernel image mapping into the new linear-mapped array, dereferencing an unavailable address. The failure occurs during early boot before userspace starts, interrupting system startup; published records identify no post-boot trigger or attacker-controlled input.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected RISC-V Linux kernels causes a boot-time page fault when numerous memory regions are reserved. Before the linear mapping is ready, memblock_double_array reallocates the reserved-regions array and copies data from the kernel image mapping into the new linear-mapped array, dereferencing an unavailable address. The failure occurs during early boot before userspace starts, interrupting system startup; published records identify no post-boot trigger or attacker-controlled input.

The record

CVE
CVE-2023-53699
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2025Record 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=5.3
  2. Affected versionversion=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <0a1b80ff4f721c4be98707bfe9d20238df133eb8
  3. Affected versionversion=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <85fadc0d04119c2fe4a20287767ab904c6d21ba1
  4. Affected versionversion=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <a4284246fca2ef482a8fcf5ad7d2c33a45b41e9c
  5. Affected versionversion=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <ba11f4e59509538810e5c44578fc73984acdf1d7

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <0a1b80ff4f721c4be98707bfe9d20238df133eb8; version=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <85fadc0d04119c2fe4a20287767ab904c6d21ba1; version=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <a4284246fca2ef482a8fcf5ad7d2c33a45b41e9c; version=671f9a3e2e24cdeb2d2856abee7422f093e23e29 <ba11f4e59509538810e5c44578fc73984acdf1d7

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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