CVE-2026-64477

Unspecified impact via out-of-bounds NUMA node lookup

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds access in resctrl monitoring in Linux Kernel allows attackers to cause unspecified impact during CPU offlining. When an SNC monitoring domain's empty cpu_mask is offlined, the limbo handler reads a busy RMID and passes nr_cpu_ids to cpu_to_node(), producing an invalid lookup. The path requires x86 Sub-NUMA Clustering, resctrl LLC occupancy monitoring, a busy RMID, and removal of the domain's last online CPU; no concrete security consequence or attacker privilege is published.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in resctrl monitoring in Linux Kernel allows attackers to cause unspecified impact during CPU offlining. When an SNC monitoring domain's empty cpu_mask is offlined, the limbo handler reads a busy RMID and passes nr_cpu_ids to cpu_to_node(), producing an invalid lookup. The path requires x86 Sub-NUMA Clustering, resctrl LLC occupancy monitoring, a busy RMID, and removal of the domain's last online CPU; no concrete security consequence or attacker privilege is published.

The record

CVE
CVE-2026-64477
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=6.11
  2. Affected versionversion=e13db55b5a0d447dea63cde772c1078405bbbf96 <58c5ec23b1a238eb75cb0aba6f69d8f9e68ef0b2
  3. Affected versionversion=e13db55b5a0d447dea63cde772c1078405bbbf96 <be1567992417dc92133e74126de7a6066c825ac9
  4. Affected versionversion=e13db55b5a0d447dea63cde772c1078405bbbf96 <ebc300b7ee0c669fa76a7a8858298ff32e296103
  5. Affected versionversion=e13db55b5a0d447dea63cde772c1078405bbbf96 <fc16126cc11d9f507130bf84ab137ee0938c900e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11; version=e13db55b5a0d447dea63cde772c1078405bbbf96 <58c5ec23b1a238eb75cb0aba6f69d8f9e68ef0b2; version=e13db55b5a0d447dea63cde772c1078405bbbf96 <be1567992417dc92133e74126de7a6066c825ac9; version=e13db55b5a0d447dea63cde772c1078405bbbf96 <ebc300b7ee0c669fa76a7a8858298ff32e296103; version=e13db55b5a0d447dea63cde772c1078405bbbf96 <fc16126cc11d9f507130bf84ab137ee0938c900e

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
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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