Type Confusion in Linux kernel - CVE-2026-43456
Published: May 8, 2026
Vulnerability identifier: #VU130723
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-43456
CWE-ID: CWE-843
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-43456
Install security update from vendor's repository.