CVE-2026-23273

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

macvlan: observe an RCU grace period in macvlan_common_newlink() error path

valis reported that a race condition still happens after my prior patch.

macvlan_common_newlink() might have made @dev visible before

detecting an error, and its caller will directly call free_netdev(dev).

We must respect an RCU period, either in macvlan or the core networking

stack.

After adding a temporary mdelay(1000) in macvlan_forward_source_one()

to open the race window, valis repro was:

ip link add p1 type veth peer p2

ip link set address 00:00:00:00:00:20 dev p1

ip link set up dev p1

ip link set up dev p2

ip link add mv0 link p2 type macvlan mode source

(ip link add invalid% link p2 type macvlan mode source macaddr add

00:00:00:00:00:20 &) ; sleep 0.5 ; ping -c1 -I p1 1.2.3.4

PING 1.2.3.4 (1.2.3.4): 56 data bytes

RTNETLINK answers: Invalid argument

BUG: KASAN: slab-use-after-free in macvlan_forward_source

(drivers/net/macvlan.c:408 drivers/net/macvlan.c:444)

Read of size 8 at addr ffff888016bb89c0 by task e/175

CPU: 1 UID: 1000 PID: 175 Comm: e Not tainted 6.19.0-rc8+ #33 NONE

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014

Call Trace:

<IRQ>

dump_stack_lvl (lib/dump_stack.c:123)

print_report (mm/kasan/report.c:379 mm/kasan/report.c:482)

? macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444)

kasan_report (mm/kasan/report.c:597)

? macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444)

macvlan_forward_source (drivers/net/macvlan.c:408 drivers/net/macvlan.c:444)

? tasklet_init (kernel/softirq.c:983)

macvlan_handle_frame (drivers/net/macvlan.c:501)

Allocated by task 169:

kasan_save_stack (mm/kasan/common.c:58)

kasan_save_track (./arch/x86/include/asm/current.h:25

mm/kasan/common.c:70 mm/kasan/common.c:79)

__kasan_kmalloc (mm/kasan/common.c:419)

__kvmalloc_node_noprof (./include/linux/kasan.h:263 mm/slub.c:5657

mm/slub.c:7140)

alloc_netdev_mqs (net/core/dev.c:12012)

rtnl_create_link (net/core/rtnetlink.c:3648)

rtnl_newlink (net/core/rtnetlink.c:3830 net/core/rtnetlink.c:3957

net/core/rtnetlink.c:4072)

rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)

netlink_rcv_skb (net/netlink/af_netlink.c:2550)

netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)

netlink_sendmsg (net/netlink/af_netlink.c:1894)

__sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2206)

__x64_sys_sendto (net/socket.c:2209)

do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)

entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)

Freed by task 169:

kasan_save_stack (mm/kasan/common.c:58)

kasan_save_track (./arch/x86/include/asm/current.h:25

mm/kasan/common.c:70 mm/kasan/common.c:79)

kasan_save_free_info (mm/kasan/generic.c:587)

__kasan_slab_free (mm/kasan/common.c:287)

kfree (mm/slub.c:6674 mm/slub.c:6882)

rtnl_newlink (net/core/rtnetlink.c:3845 net/core/rtnetlink.c:3957

net/core/rtnetlink.c:4072)

rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)

netlink_rcv_skb (net/netlink/af_netlink.c:2550)

netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)

netlink_sendmsg (net/netlink/af_netlink.c:1894)

__sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2206)

__x64_sys_sendto (net/socket.c:2209)

do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)

entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)