CVE-2025-38022

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

RDMA/core: Fix "KASAN: slab-use-after-free Read in ibregisterdevice" problem

Call Trace:

__dumpstack lib/dumpstack.c:94 [inline] dump_stacklvl+0x116/0x1f0 lib/dumpstack.c:120 printaddressdescription mm/kasan/report.c:408 [inline] printreport+0xc3/0x670 mm/kasan/report.c:521 kasanreport+0xe0/0x110 mm/kasan/report.c:634 strlen+0x93/0xa0 lib/string.c:420 __fortifystrlen include/linux/fortify-string.h:268 [inline] getkobjpathlength lib/kobject.c:118 [inline] kobjectgetpath+0x3f/0x2a0 lib/kobject.c:158 kobjectueventenv+0x289/0x1870 lib/kobjectuevent.c:545 ibregisterdevice drivers/infiniband/core/device.c:1472 [inline] ibregisterdevice+0x8cf/0xe00 drivers/infiniband/core/device.c:1393 rxeregisterdevice+0x275/0x320 drivers/infiniband/sw/rxe/rxeverbs.c:1552 rxenetadd+0x8e/0xe0 drivers/infiniband/sw/rxe/rxenet.c:550 rxenewlink+0x70/0x190 drivers/infiniband/sw/rxe/rxe.c:225 nldevnewlink+0x3a3/0x680 drivers/infiniband/core/nldev.c:1796 rdmanlrcvmsg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195 rdmanlrcvskb.constprop.0.isra.0+0x2e5/0x450 netlinkunicastkernel net/netlink/afnetlink.c:1313 [inline] netlinkunicast+0x53a/0x7f0 net/netlink/afnetlink.c:1339 netlinksendmsg+0x8d1/0xdd0 net/netlink/afnetlink.c:1883 socksendmsgnosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 _syssendmsg+0x16d/0x220 net/socket.c:2652 dosyscallx64 arch/x86/entry/syscall64.c:63 [inline] dosyscall64+0xcd/0x260 arch/x86/entry/syscall64.c:94 entrySYSCALL64afterhwframe+0x77/0x7f

This problem is similar to the problem that the commit 1d6a9e7449e2 ("RDMA/core: Fix use-after-free when rename device name") fixes.

The root cause is: the function ibdevicerename() renames the name with lock. But in the function kobject_uevent(), this name is accessed without lock protection at the same time.

The solution is to add the lock protection when this name is accessed in the function kobject_uevent().