CVE-2025-40164

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

usbnet: Fix using smp_processor_id() in preemptible code warnings

Syzbot reported the following warning:

BUG: using smp_processor_id() in preemptible [00000000] code: dhcpcd/2879

caller is usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331

CPU: 1 UID: 0 PID: 2879 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller-00098-g615dca38c2ea #0 PREEMPT(voluntary)

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120

check_preemption_disabled+0xd0/0xe0 lib/smp_processor_id.c:49

usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331

usbnet_resume_rx+0x4b/0x170 drivers/net/usb/usbnet.c:708

usbnet_change_mtu+0x1be/0x220 drivers/net/usb/usbnet.c:417

__dev_set_mtu net/core/dev.c:9443 [inline]

netif_set_mtu_ext+0x369/0x5c0 net/core/dev.c:9496

netif_set_mtu+0xb0/0x160 net/core/dev.c:9520

dev_set_mtu+0xae/0x170 net/core/dev_api.c:247

dev_ifsioc+0xa31/0x18d0 net/core/dev_ioctl.c:572

dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:821

sock_do_ioctl+0x19d/0x280 net/socket.c:1204

sock_ioctl+0x42f/0x6a0 net/socket.c:1311

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:906 [inline]

__se_sys_ioctl fs/ioctl.c:892 [inline]

__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892

do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]

do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94

entry_SYSCALL_64_after_hwframe+0x77/0x7f

For historical and portability reasons, the netif_rx() is usually

run in the softirq or interrupt context, this commit therefore add

local_bh_disable/enable() protection in the usbnet_resume_rx().