SB2026050871 - Type Confusion in Linux kernel net bonding driver

Description

This security bulletin contains information about 1 vulnerability.

1) Type Confusion (CVE-ID: CVE-2026-43456)

CWE-ID: CWE-843 - Type confusion

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to type confusion in bond_setup_by_slave() when handling header operations for a bonded non-Ethernet slave device. A local user can enslave a non-Ethernet device such as a GRE tunnel to a bond and trigger packet transmission to cause a denial of service.

The issue is triggered because header callbacks from the slave device are invoked with the bond device context, causing device-specific private data to be interpreted as the wrong type.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6ac890f1d60ac3707ee8dae15a67d9a833e49956
• https://git.kernel.org/stable/c/950803f7254721c1c15858fbbfae3deaaeeecb11
• https://git.kernel.org/stable/c/95597d11dc8bddb2b9a051c9232000bfbb5e43ba
• https://git.kernel.org/stable/c/9baf26a91565b7bb2b1d9f99aaf884a2b28c2f6d