CVE-2024-36286

Local system crash via missing RCU read lock

Published Jun 21, 2024 · Updated Aug 5, 2026

Improper locking in Linux kernel netfilter allows local users to crash the system through Netfilter queue-instance teardown. The instance_destroy_rcu() callback calls nfqnl_flush() and nf_reinject() without holding rcu_read_lock(), leaving RCU-protected dereferences unsafely exposed. Low-privileged local access is required, and exploitation is limited to service interruption through a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux kernel netfilter allows local users to crash the system through Netfilter queue-instance teardown. The instance_destroy_rcu() callback calls nfqnl_flush() and nf_reinject() without holding rcu_read_lock(), leaving RCU-protected dereferences unsafely exposed. Low-privileged local access is required, and exploitation is limited to service interruption through a kernel crash.

The record

CVE
CVE-2024-36286
Published
Jun 21, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-1287, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=V3.1.0 <V3.1.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=2.6.25; version=9872bec773c2e8503fec480c1e8a0c732517e257 <215df6490e208bfdd5b3012f5075e7f8736f3e7a; version=9872bec773c2e8503fec480c1e8a0c732517e257 <25ea5377e3d2921a0f96ae2551f5ab1b36825dd4; version=9872bec773c2e8503fec480c1e8a0c732517e257 <3989b817857f4890fab9379221a9d3f52bf5c256; version=9872bec773c2e8503fec480c1e8a0c732517e257 <68f40354a3851df46c27be96b84f11ae193e36c5; version=9872bec773c2e8503fec480c1e8a0c732517e257 <8658bd777cbfcb0c13df23d0ea120e70517761b9; version=9872bec773c2e8503fec480c1e8a0c732517e257 <8f365564af898819a523f1a8cf5c6ce053e9f718; version=9872bec773c2e8503fec480c1e8a0c732517e257 <dc21c6cc3d6986d938efbf95de62473982c98dec; version=9872bec773c2e8503fec480c1e8a0c732517e257 <e01065b339e323b3dfa1be217fd89e9b3208b0ab
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.0 <V3.1.5
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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

CWE-1287Improper Validation of Specified Type of Input
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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