CVE-2026-23359

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

bpf: Fix stack-out-of-bounds write in devmap

get_upper_ifindexes() iterates over all upper devices and writes their

indices into an array without checking bounds.

Also the callers assume that the max number of upper devices is

MAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack,

but that assumption is not correct and the number of upper devices could

be larger than MAX_NEST_DEV (e.g., many macvlans), causing a

stack-out-of-bounds write.

Add a max parameter to get_upper_ifindexes() to avoid the issue.

When there are too many upper devices, return -EOVERFLOW and abort the

redirect.

To reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with

an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS.

Then send a packet to the device to trigger the XDP redirect path.