CVE-2026-43212

Out-of-bounds kernel read via negative NUMA node

Published May 6, 2026 · Updated May 6, 2026

An out-of-bounds read in the LoongArch Linux kernel allows local users to access memory before a CPU-mask array via NUMA_NO_NODE. The arch-specific cpumask_of_node() macro indexes cpus_on_node directly with the supplied node value, so the valid sentinel value -1 selects an element before the array instead of the all-CPU mask. Exploitation requires low-privileged local access on a LoongArch system; public sources identify no specific trigger or demonstrated exploit outcome.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in the LoongArch Linux kernel allows local users to access memory before a CPU-mask array via NUMA_NO_NODE. The arch-specific cpumask_of_node() macro indexes cpus_on_node directly with the supplied node value, so the valid sentinel value -1 selects an element before the array instead of the all-CPU mask. Exploitation requires low-privileged local access on a LoongArch system; public sources identify no specific trigger or demonstrated exploit outcome.

The record

CVE
CVE-2026-43212
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1d8f2f024801019d85159a020b72a4424b46bcf4
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61a56df2fbaad3a4d00f0c6a904b5d1ee8982eb4
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <92adfb707beec0fe956424373654a70aad35ea13
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <94b0c831eda778ae9e4f2164a8b3de485d8977bb
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b5bf05e05cdf489a04137e4da407de9d4cca5295
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bb1a54f7f011f19ed936632698eae574e0b91063

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1d8f2f024801019d85159a020b72a4424b46bcf4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61a56df2fbaad3a4d00f0c6a904b5d1ee8982eb4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <92adfb707beec0fe956424373654a70aad35ea13; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <94b0c831eda778ae9e4f2164a8b3de485d8977bb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b5bf05e05cdf489a04137e4da407de9d4cca5295; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bb1a54f7f011f19ed936632698eae574e0b91063

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
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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