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CVE-2026-43456 is a Linux kernel vulnerability in the bonding driver caused by type confusion in bond_setup_by_slave(). When a non-Ethernet slave device such as a GRE or IP6GRE tunnel is attached to a bond, the bonding code copies the slave device's header_ops directly into the bond device. Later, when packet header construction callbacks are invoked through dev_hard_header(), tunnel-specific header functions execute with the bond device as their argument. Those functions expect the private device data layout of the tunnel device, but netdev_priv() instead returns the bond device's private structure. This mismatch causes the callback to interpret a struct bonding object as tunnel-specific private data, leading to invalid reads and memory corruption in the networking stack. The issue can manifest as kernel BUG/Oops conditions during packet transmission, and available reporting indicates the flaw was also developed into a reliable local privilege-escalation exploit by leveraging controlled corruption of sk_buff-associated metadata.
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A Linux kernel privilege escalation vulnerability in the net/bonding subsystem caused by type confusion when a bond device copies header_ops from a slave device, enabling reliable local privilege escalation/root via crafted GRE/IP6GRE interface chaining.
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Cross-references every affected SKU, including bundled OEM variants.
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