CVE-2026-31559

Boot interruption via unchecked allocation failure

Published Apr 24, 2026 · Updated Apr 24, 2026

NULL pointer dereference in Linux Kernel LoongArch code allows local users to interrupt boot when memory allocation fails during CPU model parsing. The init_cpu_fullname function passes an unchecked NULL result from kstrdup to strsep while reading the device-tree model property. Reachability requires an affected LoongArch kernel to encounter the allocation failure during early boot, producing a kernel oops that can prevent startup.

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

NULL pointer dereference in Linux Kernel LoongArch code allows local users to interrupt boot when memory allocation fails during CPU model parsing. The init_cpu_fullname function passes an unchecked NULL result from kstrdup to strsep while reading the device-tree model property. Reachability requires an affected LoongArch kernel to encounter the allocation failure during early boot, producing a kernel oops that can prevent startup.

The record

CVE
CVE-2026-31559
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3a28daa9b7d7c2ddf2c722e9e95d7e0928bf0cd1
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5e7fde2c551f86e6c3de3fd7a9b1f52806ac8db0
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1da957c25cf751a2dce8fb7777f82ccbac0cb3e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b61a309743322fb57fb9afa9aa3495ac758e4f5e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3a28daa9b7d7c2ddf2c722e9e95d7e0928bf0cd1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5e7fde2c551f86e6c3de3fd7a9b1f52806ac8db0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a1da957c25cf751a2dce8fb7777f82ccbac0cb3e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b61a309743322fb57fb9afa9aa3495ac758e4f5e

Published CVSS scores

5.5NVDCVSS: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

CWE-476NULL Pointer Dereference

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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