CVE-2026-43103
Analyzed Analyzed - Analysis Complete
LAPB over Ethernet Type Change Handling in Linux Kernel

Publication date: 2026-05-06

Last updated on: 2026-06-01

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: net: lapbether: handle NETDEV_PRE_TYPE_CHANGE lapbeth_data_transmit() expects the underlying device type to be ARPHRD_ETHER. Returning NOTIFY_BAD from lapbeth_device_event() makes sure bonding driver can not break this expectation.
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Meta Information
Published
2026-05-06
Last Modified
2026-06-01
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-43103
EUVD
EUVD-2026-27616
Affected Vendors & Products
Showing 11 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.13 (inc) to 6.18.24 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.14 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.83 (exc)
linux linux_kernel From 2.6.24 (inc) to 6.6.136 (exc)
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Exploitability
CWE
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability in the Linux kernel involves the lapbether network driver. Specifically, the function lapbeth_data_transmit() expects the underlying device type to be ARPHRD_ETHER (Ethernet). The issue was that without proper handling of the NETDEV_PRE_TYPE_CHANGE event, this expectation could be broken. The fix ensures that returning NOTIFY_BAD from lapbeth_device_event() prevents the bonding driver from violating this expectation.

Impact Analysis

If the lapbeth_data_transmit() function's expectation about the device type is broken, it could lead to improper handling of network data transmission in bonded network interfaces. This might cause network communication issues or instability in systems relying on the lapbether driver and bonding functionality.

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