CVE-2024-35969

System crash via IPv6 address lookup race

Published May 20, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel IPv6 address subsystem allows attackers to crash affected systems via concurrent address lookup and deletion. ipv6_get_ifaddr can retain an RCU-removed inet6_ifaddr after ipv6_del_addr drops its final reference, then increment and return the stale object. Reachability requires IPv6 NDP traffic from the same link or local netlink activity to race address deletion; the observed result is a kernel warning, panic, or slab corruption.

CVSS severity8.8
High
EPSS probability0.38%
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 kernel IPv6 address subsystem allows attackers to crash affected systems via concurrent address lookup and deletion. ipv6_get_ifaddr can retain an RCU-removed inet6_ifaddr after ipv6_del_addr drops its final reference, then increment and return the stale object. Reachability requires IPv6 NDP traffic from the same link or local netlink activity to race address deletion; the observed result is a kernel warning, panic, or slab corruption.

The record

CVE
CVE-2024-35969
Published
May 20, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-770, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=2.6.35; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <01b11a0566670612bd464a932e5ac2eae53d8652; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <3fb02ec57ead2891a2306af8c51a306bc5945e70; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <4b19e9507c275de0cfe61c24db69179dc52cf9fb; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <6cdb20c342cd0193d3e956e3d83981d0f438bb83; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <7633c4da919ad51164acbf1aa322cc1a3ead6129; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <b4b3b69a19016d4e7fbdbd1dbcc184915eb862e1; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <cca606e14264098cba65efa82790825dbf69e903; version=5c578aedcb21d79eeb4e9cf04ca5b276ac82614c <de76ae9ea1a6cf9e77fcec4f2df2904e26c23ceb
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.8Linux Kernel CVE TeamCVSS:3.1/AV:A/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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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