CVE-2024-50085

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

mptcp: pm: fix UaF read in mptcp_pm_nl_rm_addr_or_subflow

Syzkaller reported this splat:

==================================================================

BUG: KASAN: slab-use-after-free in mptcp_pm_nl_rm_addr_or_subflow+0xb44/0xcc0 net/mptcp/pm_netlink.c:881

Read of size 4 at addr ffff8880569ac858 by task syz.1.2799/14662

CPU: 0 UID: 0 PID: 14662 Comm: syz.1.2799 Not tainted 6.12.0-rc2-syzkaller-00307-g36c254515dc6 #0

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120

print_address_description mm/kasan/report.c:377 [inline]

print_report+0xc3/0x620 mm/kasan/report.c:488

kasan_report+0xd9/0x110 mm/kasan/report.c:601

mptcp_pm_nl_rm_addr_or_subflow+0xb44/0xcc0 net/mptcp/pm_netlink.c:881

mptcp_pm_nl_rm_subflow_received net/mptcp/pm_netlink.c:914 [inline]

mptcp_nl_remove_id_zero_address+0x305/0x4a0 net/mptcp/pm_netlink.c:1572

mptcp_pm_nl_del_addr_doit+0x5c9/0x770 net/mptcp/pm_netlink.c:1603

genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115

genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]

genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210

netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2551

genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219

netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]

netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1357

netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1901

sock_sendmsg_nosec net/socket.c:729 [inline]

__sock_sendmsg net/socket.c:744 [inline]

____sys_sendmsg+0x9ae/0xb40 net/socket.c:2607

___sys_sendmsg+0x135/0x1e0 net/socket.c:2661

__sys_sendmsg+0x117/0x1f0 net/socket.c:2690

do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]

__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386

do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411

entry_SYSENTER_compat_after_hwframe+0x84/0x8e

RIP: 0023:0xf7fe4579

Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00

RSP: 002b:00000000f574556c EFLAGS: 00000296 ORIG_RAX: 0000000000000172

RAX: ffffffffffffffda RBX: 000000000000000b RCX: 0000000020000140

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000

R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

</TASK>

Allocated by task 5387:

kasan_save_stack+0x33/0x60 mm/kasan/common.c:47

kasan_save_track+0x14/0x30 mm/kasan/common.c:68

poison_kmalloc_redzone mm/kasan/common.c:377 [inline]

__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394

kmalloc_noprof include/linux/slab.h:878 [inline]

kzalloc_noprof include/linux/slab.h:1014 [inline]

subflow_create_ctx+0x87/0x2a0 net/mptcp/subflow.c:1803

subflow_ulp_init+0xc3/0x4d0 net/mptcp/subflow.c:1956

__tcp_set_ulp net/ipv4/tcp_ulp.c:146 [inline]

tcp_set_ulp+0x326/0x7f0 net/ipv4/tcp_ulp.c:167

mptcp_subflow_create_socket+0x4ae/0x10a0 net/mptcp/subflow.c:1764

__mptcp_subflow_connect+0x3cc/0x1490 net/mptcp/subflow.c:1592

mptcp_pm_create_subflow_or_signal_addr+0xbda/0x23a0 net/mptcp/pm_netlink.c:642

mptcp_pm_nl_fully_established net/mptcp/pm_netlink.c:650 [inline]

mptcp_pm_nl_work+0x3a1/0x4f0 net/mptcp/pm_netlink.c:943

mptcp_worker+0x15a/0x1240 net/mptcp/protocol.c:2777

process_one_work+0x958/0x1b30 kernel/workqueue.c:3229

process_scheduled_works kernel/workqueue.c:3310 [inline]

worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391

kthread+0x2c1/0x3a0 kernel/kthread.c:389

ret_from_fork+0x45/0x80 arch/x86/ke

---truncated---