CVE-2024-40957Network attack vector

Kernel crash via reversed Netfilter device arguments

Published Jul 12, 2024 · Updated Aug 5, 2026

NULL pointer dereference in Linux seg6 End.DX4 and End.DX6 handling allows remote attackers to crash the kernel via an IPv6 packet. The two input handlers pass NULL as the inbound device and the real inbound device as the outbound device to the Netfilter PREROUTING hook, causing rpfilter_is_loopback() to dereference the NULL input pointer. Reachability requires an SRv6 End.DX4 or End.DX6 SID plus netfilter processing; one routed packet can panic or render the host unusable without disclosing or modifying data.

CVSS severity7.5
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux seg6 End.DX4 and End.DX6 handling allows remote attackers to crash the kernel via an IPv6 packet. The two input handlers pass NULL as the inbound device and the real inbound device as the outbound device to the Netfilter PREROUTING hook, causing rpfilter_is_loopback() to dereference the NULL input pointer. Reachability requires an SRv6 End.DX4 or End.DX6 SID plus netfilter processing; one routed packet can panic or render the host unusable without disclosing or modifying data.

The record

CVE
CVE-2024-40957
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 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=5.15
  2. Affected versionversion=7a3f5b0de3647c854e34269c3332d7a1e902901a <561475d53aa7e4511ee7cdba8728ded81cf1db1c
  3. Affected versionversion=7a3f5b0de3647c854e34269c3332d7a1e902901a <9a3bc8d16e0aacd65c31aaf23a2bced3288a7779
  4. Affected versionversion=7a3f5b0de3647c854e34269c3332d7a1e902901a <af90e3d73dc45778767b2fb6e7edd57ebe34380d
  5. Affected versionversion=7a3f5b0de3647c854e34269c3332d7a1e902901a <d62df86c172033679d744f07d89e93e367dd11f6
  6. Affected versionversion=7a3f5b0de3647c854e34269c3332d7a1e902901a <ec4d970b597ee5e17b0d8d73b7875197ce9a04d4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=7a3f5b0de3647c854e34269c3332d7a1e902901a <561475d53aa7e4511ee7cdba8728ded81cf1db1c; version=7a3f5b0de3647c854e34269c3332d7a1e902901a <9a3bc8d16e0aacd65c31aaf23a2bced3288a7779; version=7a3f5b0de3647c854e34269c3332d7a1e902901a <af90e3d73dc45778767b2fb6e7edd57ebe34380d; version=7a3f5b0de3647c854e34269c3332d7a1e902901a <d62df86c172033679d744f07d89e93e367dd11f6; version=7a3f5b0de3647c854e34269c3332d7a1e902901a <ec4d970b597ee5e17b0d8d73b7875197ce9a04d4

Published CVSS scores

7.5Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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