CVE-2026-43079

Boot-time disruption via offline-die array overflow

Published May 6, 2026 · Updated May 6, 2026

An array overflow in Linux Kernel 5.13 and later allows attackers to disrupt affected Intel systems during uncore discovery at boot. uncore_pci_pmu_register() continues parsing an offline die's discovery table, indexes pmu->boxes with that die, and writes beyond the array. Reachability requires disabled NUMA and fewer online CPUs than die 0 contains; the Linux CNA documents a kernel warning but leaves other consequences unspecified.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An array overflow in Linux Kernel 5.13 and later allows attackers to disrupt affected Intel systems during uncore discovery at boot. uncore_pci_pmu_register() continues parsing an offline die's discovery table, indexes pmu->boxes with that die, and writes beyond the array. Reachability requires disabled NUMA and fewer online CPUs than die 0 contains; the Linux CNA documents a kernel warning but leaves other consequences unspecified.

The record

CVE
CVE-2026-43079
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=5.13
  2. Affected versionversion=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <6cfc187d85f18f976d0fe527d4c6f6171542cc19
  3. Affected versionversion=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <7a2cb02437d92ed14fe494d8994056d5bd2c72b4
  4. Affected versionversion=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <7b568e9eba2fad89a696f22f0413d44cf4a1f892
  5. Affected versionversion=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <cfab2c817d2e7e0bee98d66850246ce842ed5f18
  6. Affected versionversion=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <f34feda8e0c9535fee3f8870ce8bab53c2798f71

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.13; version=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <6cfc187d85f18f976d0fe527d4c6f6171542cc19; version=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <7a2cb02437d92ed14fe494d8994056d5bd2c72b4; version=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <7b568e9eba2fad89a696f22f0413d44cf4a1f892; version=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <cfab2c817d2e7e0bee98d66850246ce842ed5f18; version=edae1f06c2cda41edffc93de6aedc8ba8dc883c3 <f34feda8e0c9535fee3f8870ce8bab53c2798f71

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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