CVE-2026-43441Network attack vector

Kernel crash via disabled-IPv6 bonding validation

Published May 8, 2026 · Updated May 8, 2026

NULL pointer dereference in Linux Kernel allows remote attackers to crash the kernel via a crafted IPv6 NS/NA frame. With IPv6 disabled, nd_tbl remains uninitialized, but bond_rcv_validate dispatches the frame through bond_validate_na to ipv6_chk_addr. Reachability requires the ipv6.disable=1 boot parameter, enabled bonding ARP/NS validation, and receipt of the frame on a bond slave; the reported consequence is a kernel crash.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

NULL pointer dereference in Linux Kernel allows remote attackers to crash the kernel via a crafted IPv6 NS/NA frame. With IPv6 disabled, nd_tbl remains uninitialized, but bond_rcv_validate dispatches the frame through bond_validate_na to ipv6_chk_addr. Reachability requires the ipv6.disable=1 boot parameter, enabled bonding ARP/NS validation, and receipt of the frame on a bond slave; the reported consequence is a kernel crash.

The record

CVE
CVE-2026-43441
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 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=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <30021e969d48e5819d5ae56936c2f34c0f7ce997
  2. Affected versionversion=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <49dbfcb70eca5f6f9043594e1e323c74c39e3863
  3. Affected versionversion=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <95faa1459b83fa544191e82ccc73856f03b7741f
  4. Affected versionversion=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <c78f01abe535853f13f0b26cd5b1d2f19bf52e2f
  5. Affected versionversion=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <c9c238066fb254dabf65e27379f93c56112c5b96
  6. Affected versionversion=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <cf6099ef493b94e140b0fad52482a78853115318
  7. Affected versionversion=5.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <30021e969d48e5819d5ae56936c2f34c0f7ce997; version=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <49dbfcb70eca5f6f9043594e1e323c74c39e3863; version=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <95faa1459b83fa544191e82ccc73856f03b7741f; version=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <c78f01abe535853f13f0b26cd5b1d2f19bf52e2f; version=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <c9c238066fb254dabf65e27379f93c56112c5b96; version=4e24be018eb9dbcefa4b01c07e298b147dc1a4d7 <cf6099ef493b94e140b0fad52482a78853115318; version=5.18

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo