CVE-2024-47734

/// Technical description

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

bonding: Fix unnecessary warnings and logs from bond_xdp_get_xmit_slave()

syzbot reported a WARNING in bond_xdp_get_xmit_slave. To reproduce

this[1], one bond device (bond1) has xdpdrv, which increases

bpf_master_redirect_enabled_key. Another bond device (bond0) which is

unsupported by XDP but its slave (veth3) has xdpgeneric that returns

XDP_TX. This triggers WARN_ON_ONCE() from the xdp_master_redirect().

To reduce unnecessary warnings and improve log management, we need to

delete the WARN_ON_ONCE() and add ratelimit to the netdev_err().

[1] Steps to reproduce:

# Needs tx_xdp with return XDP_TX;

ip l add veth0 type veth peer veth1

ip l add veth3 type veth peer veth4

ip l add bond0 type bond mode 6 # BOND_MODE_ALB, unsupported by XDP

ip l add bond1 type bond # BOND_MODE_ROUNDROBIN by default

ip l set veth0 master bond1

ip l set bond1 up

# Increases bpf_master_redirect_enabled_key

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References