CVE-2026-31600Network attack vector

Kernel panic via mishandled invalid leaf mappings

Published Apr 24, 2026 · Updated Apr 24, 2026

NULL pointer dereference in the arm64 memory manager in Linux Kernel allows remote attackers to cause a kernel panic. Page-table helpers treat invalid large leaf entries as usable after PTE_VALID is cleared, then access the invalid linear mapping. The demonstrated failure occurs while booting an arm64 realm guest on a BBML2_NOABORT system with memory encryption and DMA bounce buffering; no network trigger is publicly described.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the arm64 memory manager in Linux Kernel allows remote attackers to cause a kernel panic. Page-table helpers treat invalid large leaf entries as usable after PTE_VALID is cleared, then access the invalid linear mapping. The demonstrated failure occurs while booting an arm64 realm guest on a BBML2_NOABORT system with memory encryption and DMA bounce buffering; no network trigger is publicly described.

The record

CVE
CVE-2026-31600
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <747b6482e4e227fd351197dde6f64a97107a9e52
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8140b21d19015227a28c255404462f2d3e6edc9a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbea627ea634f41c79d18f0c6d20db66fa93514c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <747b6482e4e227fd351197dde6f64a97107a9e52; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8140b21d19015227a28c255404462f2d3e6edc9a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbea627ea634f41c79d18f0c6d20db66fa93514c

Published CVSS scores

7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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