CVE-2024-35884

Kernel crash via premature UDP GRO

Published May 19, 2024 · Updated Aug 5, 2026

Improper tunnel-packet handling in the Linux kernel allows local users to corrupt packets or crash the kernel during UDP forwarding. udp4_gro_lookup_skb and udp6_gro_lookup_skb search only the current network namespace, allowing non-tunnel GSO packets to be coalesced before a tunnel removes its header without correcting frag_list offsets. Reachability requires rx-udp-gro-forwarding or rx-gro-list plus a UDP tunnel whose endpoint is in another network namespace.

CVSS severity9.8
Critical
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper tunnel-packet handling in the Linux kernel allows local users to corrupt packets or crash the kernel during UDP forwarding. udp4_gro_lookup_skb and udp6_gro_lookup_skb search only the current network namespace, allowing non-tunnel GSO packets to be coalesced before a tunnel removes its header without correcting frag_list offsets. Reachability requires rx-udp-gro-forwarding or rx-gro-list plus a UDP tunnel whose endpoint is in another network namespace.

The record

CVE
CVE-2024-35884
Published
May 19, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-923, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 19, 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

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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=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=5.6; version=9fd1ff5d2ac7181844735806b0a703c942365291 <3001e7aa43d6691db2a878b0745b854bf12ddd19; version=9fd1ff5d2ac7181844735806b0a703c942365291 <3391b157780bbedf8ef9f202cbf10ee90bf6b0f8; version=9fd1ff5d2ac7181844735806b0a703c942365291 <35fe0e0b5c00bef7dde74842a2564c43856fbce4; version=9fd1ff5d2ac7181844735806b0a703c942365291 <3d010c8031e39f5fa1e8b13ada77e0321091011f; version=9fd1ff5d2ac7181844735806b0a703c942365291 <d12245080cb259d82b34699f6cd4ec11bdb688bd; version=9fd1ff5d2ac7181844735806b0a703c942365291 <d49ae15a5767d4e9ef8bbb79e42df1bfebc94670

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
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-923Improper Restriction of Communication Channel to Intended Endpoints
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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