CVE-2026-89904

Kernel memory corruption via oversized PPTT package topology

Published Sep 16, 2026 · Updated Sep 16, 2026

Out-of-bounds write in Linux on LoongArch virtual machines allows context-dependent attackers to corrupt kernel memory during boot. The LoongArch ACPI topology parser records PPTT package identifiers in acpi_package_ids[], whose MAX_PACKAGES allocation is smaller than KVM_MAX_VCPUS. Reachability requires a PPTT table describing more packages than the array holds, such as a 256-vCPU one-core-per-socket VM; upstream has not published a demonstrated post-overflow consequence.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux on LoongArch virtual machines allows context-dependent attackers to corrupt kernel memory during boot. The LoongArch ACPI topology parser records PPTT package identifiers in acpi_package_ids[], whose MAX_PACKAGES allocation is smaller than KVM_MAX_VCPUS. Reachability requires a PPTT table describing more packages than the array holds, such as a 256-vCPU one-core-per-socket VM; upstream has not published a demonstrated post-overflow consequence.

The record

CVE
CVE-2026-89904
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=4427a33faabb4b81511b99dfee18ce0a38b5b5df <d3fd094c13c6d0b74f246461ca4cf427d539c8e8
  2. Affected versionversion=496bc868d9066e034787aa14b8ad6c23e77b51ef
  3. Affected versionversion=4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7 <2a2367d46d7a4ee4122b7a86e57125542dbbe963
  4. Affected versionversion=4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7 <6311b8c471afa33c18adbe4eb16f862936b71ca3
  5. Affected versionversion=6.12.101 <6.12.110
  6. Affected versionversion=6.18.42 <6.18.51
  7. Affected versionversion=7.1.6 <7.2
  8. Affected versionversion=7.2
  9. Affected versionversion=f18992be262d6515c94bf4bf6ce7598135076771 <0195e04b1eec8fb00e2db9c5e55655a3f5e76f60

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=4427a33faabb4b81511b99dfee18ce0a38b5b5df <d3fd094c13c6d0b74f246461ca4cf427d539c8e8; version=496bc868d9066e034787aa14b8ad6c23e77b51ef; version=4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7 <2a2367d46d7a4ee4122b7a86e57125542dbbe963; version=4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7 <6311b8c471afa33c18adbe4eb16f862936b71ca3; version=6.12.101 <6.12.110; version=6.18.42 <6.18.51; version=7.1.6 <7.2; version=7.2; version=f18992be262d6515c94bf4bf6ce7598135076771 <0195e04b1eec8fb00e2db9c5e55655a3f5e76f60

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.

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

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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