CVE-2025-71133

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

RDMA/irdma: avoid invalid read in irdma_net_event

irdma_net_event() should not dereference anything from "neigh" (alias

"ptr") until it has checked that the event is NETEVENT_NEIGH_UPDATE.

Other events come with different structures pointed to by "ptr" and they

may be smaller than struct neighbour.

Move the read of neigh->dev under the NETEVENT_NEIGH_UPDATE case.

The bug is mostly harmless, but it triggers KASAN on debug kernels:

BUG: KASAN: stack-out-of-bounds in irdma_net_event+0x32e/0x3b0 [irdma]

Read of size 8 at addr ffffc900075e07f0 by task kworker/27:2/542554

CPU: 27 PID: 542554 Comm: kworker/27:2 Kdump: loaded Not tainted 5.14.0-630.el9.x86_64+debug #1

Hardware name: [...]

Workqueue: events rt6_probe_deferred

Call Trace:

<IRQ>

dump_stack_lvl+0x60/0xb0

print_address_description.constprop.0+0x2c/0x3f0

print_report+0xb4/0x270

kasan_report+0x92/0xc0

irdma_net_event+0x32e/0x3b0 [irdma]

notifier_call_chain+0x9e/0x180

atomic_notifier_call_chain+0x5c/0x110

rt6_do_redirect+0xb91/0x1080

tcp_v6_err+0xe9b/0x13e0

icmpv6_notify+0x2b2/0x630

ndisc_redirect_rcv+0x328/0x530

icmpv6_rcv+0xc16/0x1360

ip6_protocol_deliver_rcu+0xb84/0x12e0

ip6_input_finish+0x117/0x240

ip6_input+0xc4/0x370

ipv6_rcv+0x420/0x7d0

__netif_receive_skb_one_core+0x118/0x1b0

process_backlog+0xd1/0x5d0

__napi_poll.constprop.0+0xa3/0x440

net_rx_action+0x78a/0xba0

handle_softirqs+0x2d4/0x9c0

do_softirq+0xad/0xe0

</IRQ>