CVE-2026-31542

Kernel panic via invalid UV NUMA node

Published Apr 24, 2026 · Updated Apr 24, 2026

Denial of service in affected Linux Kernel releases from 6.5 allows local users to crash x86 UV systems during UV hub allocation. The uv_system_init_hub() path passes SOCK_EMPTY (0xffff) from a deconfigured socket to kzalloc_node() as though it were a valid NUMA node. Triggering requires an x86 UV machine whose firmware marks a socket as deconfigured; the resulting panic interrupts the host without data disclosure or modification.

CVSS severity5.5
Medium
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

Denial of service in affected Linux Kernel releases from 6.5 allows local users to crash x86 UV systems during UV hub allocation. The uv_system_init_hub() path passes SOCK_EMPTY (0xffff) from a deconfigured socket to kzalloc_node() as though it were a valid NUMA node. Triggering requires an x86 UV machine whose firmware marks a socket as deconfigured; the resulting panic interrupts the host without data disclosure or modification.

The record

CVE
CVE-2026-31542
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=6.5
  2. Affected versionversion=8a50c58519271dd24ba760bb282875f6ad66ee71 <1f6aa5bbf1d0f81a8a2aafc16136e7dd9a609ff3
  3. Affected versionversion=8a50c58519271dd24ba760bb282875f6ad66ee71 <79f0faf81d3bbbe5f07bf6892450d3740a1b290d
  4. Affected versionversion=8a50c58519271dd24ba760bb282875f6ad66ee71 <9956d4892e78812246336c7ea51f5aa62018049e
  5. Affected versionversion=8a50c58519271dd24ba760bb282875f6ad66ee71 <c1cf2218d2fa40a49921a7460981e5faab26f04e
  6. Affected versionversion=8a50c58519271dd24ba760bb282875f6ad66ee71 <c51957601d32c0d195bce0b9345dfe93ef5728cc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.5; version=8a50c58519271dd24ba760bb282875f6ad66ee71 <1f6aa5bbf1d0f81a8a2aafc16136e7dd9a609ff3; version=8a50c58519271dd24ba760bb282875f6ad66ee71 <79f0faf81d3bbbe5f07bf6892450d3740a1b290d; version=8a50c58519271dd24ba760bb282875f6ad66ee71 <9956d4892e78812246336c7ea51f5aa62018049e; version=8a50c58519271dd24ba760bb282875f6ad66ee71 <c1cf2218d2fa40a49921a7460981e5faab26f04e; version=8a50c58519271dd24ba760bb282875f6ad66ee71 <c51957601d32c0d195bce0b9345dfe93ef5728cc

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

T1499Endpoint Denial of Service

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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