CVE-2024-49949

Kernel crash via UFO packet length underflow

Published Oct 21, 2024 · Updated May 23, 2026

Buffer underwrite in Linux kernel qdisc_pkt_len_init() allows local users to crash the kernel through a crafted UFO GSO packet. When the packet's headers consume its full length, the segment calculation returns zero and the subsequent unsigned adjustment resets qdisc packet length to zero. Low-privileged local access and the ability to inject the crafted GSO packet are required; the resulting fq_codel fault interrupts the affected host or appliance.

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

Buffer underwrite in Linux kernel qdisc_pkt_len_init() allows local users to crash the kernel through a crafted UFO GSO packet. When the packet's headers consume its full length, the segment calculation returns zero and the subsequent unsigned adjustment resets qdisc packet length to zero. Low-privileged local access and the ability to inject the crafted GSO packet are required; the resulting fq_codel fault interrupts the affected host or appliance.

The record

CVE
CVE-2024-49949
Published
Oct 21, 2024
Updated
May 23, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-124, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=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 · SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familyversion=0 <V3.2
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=0f810d06b507aa40fef8d1ac0a88e6d0590dbfc3 <939c88cbdc668dadd8cfa7a35d9066331239041c; version=2128303bff700c857739a0af8cc39c1a41840650; version=4.14.256 <4.15; version=4.19.218 <4.19.323; version=5.10.82 <5.10.227; version=5.15.5 <5.15.168; version=5.16; version=5.4.162 <5.4.285; version=8e6bae950da9dc2d2c6c18b1c6b206dc00dc8772 <ba26060a29d3ca1bfc737aa79f7125128f35147c; version=960b360ca7463921c1a6b72e7066a706d6406223 <d70ca7598943572d5e384227bd268acb5109bf72; version=cf9acc90c80ecbee00334aa85d92f4e74014bcff <25ab0b87dbd89cecef8a9c60a02bb97832e471d1; version=cf9acc90c80ecbee00334aa85d92f4e74014bcff <81fd007dcd47c34471766249853e4d4bce8eea4b; version=cf9acc90c80ecbee00334aa85d92f4e74014bcff <c20029db28399ecc50e556964eaba75c43b1e2f1; version=cf9acc90c80ecbee00334aa85d92f4e74014bcff <d6114993e0a89fde84a60a60a8329a571580b174; version=cf9acc90c80ecbee00334aa85d92f4e74014bcff <f959cce8a2a04ce776aa8b78e83ce339e0d7fbac; version=fb2dbc124a7f800cd0e4f901a1bbb769a017104c <1598d70ad9c7d0a4d9d54b82094e9f45908fda6d
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 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2
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
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-124Buffer Underwrite ('Buffer Underflow')
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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