CVE-2024-56631

Local system compromise via premature reference release

Published Dec 27, 2024 · Updated Sep 8, 2026

Use-after-free in the Linux SCSI generic driver allows local users to compromise confidentiality, integrity, and availability. sg_release drops the final sfp reference before unlocking open_rel_lock, so deferred cleanup can free sfp while the function still accesses sfp or sdp. Exploitation requires local low-privileged access and winning the cleanup race while closing an sg file descriptor.

CVSS severity7.8
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

Use-after-free in the Linux SCSI generic driver allows local users to compromise confidentiality, integrity, and availability. sg_release drops the final sfp reference before unlocking open_rel_lock, so deferred cleanup can free sfp while the function still accesses sfp or sdp. Exploitation requires local low-privileged access and winning the cleanup race while closing an sg file descriptor.

The record

CVE
CVE-2024-56631
Published
Dec 27, 2024
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=3.16.85 <3.17; version=3.17; version=3a27c0defb0315760100f8b1adc7c4acbe04c884; version=cc833acbee9db5ca8c6162b015b4c93863c6f821 <198b89dd5a595ee3f96e5ce5c448b0484cd0e53c; version=cc833acbee9db5ca8c6162b015b4c93863c6f821 <1f5e2f1ca5875728fcf62bc1a054707444ab4960; version=cc833acbee9db5ca8c6162b015b4c93863c6f821 <275b8347e21ab8193e93223a8394a806e4ba8918; version=cc833acbee9db5ca8c6162b015b4c93863c6f821 <285ce1f89f8d414e7eecab5ef5118cd512596318; version=cc833acbee9db5ca8c6162b015b4c93863c6f821 <59b30afa578637169e2819536bb66459fdddc39d; version=cc833acbee9db5ca8c6162b015b4c93863c6f821 <e19acb1926c4a1f30ee1ec84d8afba2d975bd534; version=cc833acbee9db5ca8c6162b015b4c93863c6f821 <f10593ad9bc36921f623361c9e3dd96bd52d85ee
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

7.8Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3Siemens ProductCERTCVSS:4.0/AV:L/AC:H/AT:P/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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