CVE-2026-53069

In the Linux kernel, the following vulnerability has been resolved:

net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master

syzkaller reported a kernel panic in bond_rr_gen_slave_id() reached via

xdp_master_redirect(). Full decoded trace:

https://syzkaller.appspot.com/bug?extid=80e046b8da2820b6ba73

bond_rr_gen_slave_id() dereferences bond->rr_tx_counter, a per-CPU

counter that bonding only allocates in bond_open() when the mode is

round-robin. If the bond device was never brought up, rr_tx_counter

stays NULL.

The XDP redirect path can still reach that code on a bond that was

never opened: bpf_master_redirect_enabled_key is a global static key,

so as soon as any bond device has native XDP attached, the

XDP_TX -> xdp_master_redirect() interception is enabled for every

slave system-wide. The path xdp_master_redirect() ->

bond_xdp_get_xmit_slave() -> bond_xdp_xmit_roundrobin_slave_get() ->

bond_rr_gen_slave_id() then runs against a bond that has no

rr_tx_counter and crashes.

Fix this in the generic xdp_master_redirect() by refusing to call into

the master's ->ndo_xdp_get_xmit_slave() when the master device is not

up. IFF_UP is only set after ->ndo_open() has successfully returned,

so this reliably excludes masters whose XDP state has not been fully

initialized. Drop the frame with XDP_ABORTED so the exception is

visible via trace_xdp_exception() rather than silently falling through.

This is not specific to bonding: any current or future master that

defers XDP state allocation to ->ndo_open() is protected.