CVE-2025-5865Public exploit

Kernel crash and memory access via unchecked pointer

Published Jun 9, 2025 · Updated Jun 9, 2025

Memory corruption in RT-Thread Smart 5.1.0 allows local users to crash the kernel or access kernel memory through sys_select. The sys_select wrapper passes a user-space timeout pointer into select, which dereferences tv_sec and tv_usec after checking only for NULL instead of validating the address or copying the structure into kernel memory. Reachability requires a compromised user thread in an MMU-enabled RT-Thread Smart build; the concrete outcome is a kernel memory fault and crash, while the report describes unauthorized kernel-memory access without a working escalation path.

CVSS severity8.6
High
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in RT-Thread Smart 5.1.0 allows local users to crash the kernel or access kernel memory through sys_select. The sys_select wrapper passes a user-space timeout pointer into select, which dereferences tv_sec and tv_usec after checking only for NULL instead of validating the address or copying the structure into kernel memory. Reachability requires a compromised user thread in an MMU-enabled RT-Thread Smart build; the concrete outcome is a kernel memory fault and crash, while the report describes unauthorized kernel-memory access without a working escalation path.

The record

CVE
CVE-2025-5865
Published
Jun 9, 2025
Updated
Jun 9, 2025
Vendor
RT-Thread
Product
RT-Thread
Classifications
CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2025Record 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=5.1.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

RT-Thread · RT-Threadversion=5.1.0

Published CVSS scores

8.0VulDBCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.7VulDBAV:A/AC:L/Au:S/C:C/I:C/A:C
8.6VulDBCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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 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 exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

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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