Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:EOL][EOL]mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu().[EOL][EOL]As syzbot reported [0], mpls_route_input_rcu() can be called[EOL]from mpls_getroute(), where is under RTNL.[EOL][EOL]net->mpls.platform_label is only updated under RTNL.[EOL][EOL]Let's use rcu_dereference_rtnl() in mpls_route_input_rcu() to[EOL]silence the splat.[EOL][EOL][0]:[EOL]WARNING: suspicious RCU usage[EOL]6.15.0-rc7-syzkaller-00082-g5cdb2c77c4c3 #0 Not tainted[EOL] ----------------------------[EOL]net/mpls/af_mpls.c:84 suspicious rcu_dereference_check() usage![EOL][EOL]other info that might help us debug this:[EOL][EOL]rcu_scheduler_active = 2, debug_locks = 1[EOL]1 lock held by syz.2.4451/17730:[EOL] #0: ffffffff9012a3e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline][EOL] #0: ffffffff9012a3e8 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x371/0xe90 net/core/rtnetlink.c:6961[EOL][EOL]stack backtrace:[EOL]CPU: 1 UID: 0 PID: 17730 Comm: syz.2.4451 Not tainted 6.15.0-rc7-syzkaller-00082-g5cdb2c77c4c3 #0 PREEMPT(full)[EOL]Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025[EOL]Call Trace:[EOL] <TASK>[EOL] __dump_stack lib/dump_stack.c:94 [inline][EOL] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120[EOL] lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6865[EOL] mpls_route_input_rcu+0x1d4/0x200 net/mpls/af_mpls.c:84[EOL] mpls_getroute+0x621/0x1ea0 net/mpls/af_mpls.c:2381[EOL] rtnetlink_rcv_msg+0x3c9/0xe90 net/core/rtnetlink.c:6964[EOL] netlink_rcv_skb+0x16d/0x440 net/netlink/af_netlink.c:2534[EOL] netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline][EOL] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339[EOL] netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883[EOL] sock_sendmsg_nosec net/socket.c:712 [inline][EOL] __sock_sendmsg net/socket.c:727 [inline][EOL] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566[EOL] ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620[EOL] __sys_sendmmsg+0x200/0x420 net/socket.c:2709[EOL] __do_sys_sendmmsg net/socket.c:2736 [inline][EOL] __se_sys_sendmmsg net/socket.c:2733 [inline][EOL] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2733[EOL] do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline][EOL] do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94[EOL] entry_SYSCALL_64_after_hwframe+0x77/0x7f[EOL]RIP: 0033:0x7f0a2818e969[EOL]Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48[EOL]RSP: 002b:00007f0a28f52038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133[EOL]RAX: ffffffffffffffda RBX: 00007f0a283b5fa0 RCX: 00007f0a2818e969[EOL]RDX: 0000000000000003 RSI: 0000200000000080 RDI: 0000000000000003[EOL]RBP: 00007f0a28210ab1 R08: 0000000000000000 R09: 0000000000000000[EOL]R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000[EOL]R13: 0000000000000000 R14: 00007f0a283b5fa0 R15: 00007ffce5e9f268[EOL] </TASK>

CREATE(Triage):(User=admin) [CVE-2025-38324 (https://nvd.nist.gov/vuln/detail/CVE-2025-38324)