Vulnerabilidad en kernel de Linux (CVE-2024-26793)

En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: gtp: corrige use-after-free y null-ptr-deref en gtp_newlink() La estructura de operaciones gtp_link_ops para el subSYSTEM debe registrarse después de registrar la estructura de operaciones pernet gtp_net_ops. Syzkaller encontró el error 'fallo de protección general en gtp_genl_dump_pdp': [1010.702740] gtp: módulo GTP descargado [1010.715877] fallo de protección general, probablemente para la dirección no canónica 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI [1010.715888 ] KASAN: ptr nulo -deref en el rango [0x0000000000000008-0x000000000000000f] [ 1010.715895] CPU: 1 PID: 128616 Comm: a.out No contaminado 6.8.0-rc6-std-def-alt1 #1 [ 1010.715899] Nombre de hardware: Estándar QEMU PC (Q35+ ICH9, 2009), BIOS 1.16.0-alt1 01/04/2014 [ 1010.715908] RIP: 0010:gtp_newlink+0x4d7/0x9c0 [gtp] [ 1010.715915] Código: 80 3c 02 00 0f 85 41 04 00 0 0 48 8b bb d8 05 00 00 e8 ed f6 ff ff 48 89 c2 48 89 c5 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 4f 04 00 00 4c 89 e2 4c 8b 6d 00 4 8b8 00 00 00 [ 1010.715920] RSP: 0018:ffff888020fbf180 EFLAGS: 00010203 [ 1010.715929] RAX: dffffc0000000000 RBX: ffff88800399c000 RCX: 0000000000000 000 [ 1010.715933] RDX: 00000000000000001 RSI: ffffffff84805280 RDI: 0000000000000282 [ 1010.715938] RBP: 000000000000000d R08: 000000000000 0001 R09: 0000000000000000 [ 1010.715942] R10: 0000000000000001 R11: 0000000000000001 R12: ffff88800399cc80 [ 1010.715947] R13: 0000000000000000 R14: 00000000000 00000 R15: 0000000000000400 [ 1010.715953] FS: 00007fd1509ab5c0(0000) GS:ffff88805b300000(0000) knlGS:0000000000000000 [ 1010.715958] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1010.715962] CR2: 0000000000000000 CR3: 000000001c07a000 CR4: 0000000000750ee0 [ 1010.715968] PKRU: 55555 554 [1010.715972] Seguimiento de llamadas: [1010.715985]? __die_body.cold+0x1a/0x1f [ 1010.715995] ? die_addr+0x43/0x70 [1010.716002]? exc_general_protection+0x199/0x2f0 [1010.716016]? asm_exc_general_protection+0x1e/0x30 [1010.716026]? gtp_newlink+0x4d7/0x9c0 [gtp] [ 1010.716034] ? gtp_net_exit+0x150/0x150 [gtp] [ 1010.716042] __rtnl_newlink+0x1063/0x1700 [ 1010.716051] ? rtnl_setlink+0x3c0/0x3c0 [1010.716063]? is_bpf_text_address+0xc0/0x1f0 [1010.716070]? kernel_text_address.part.0+0xbb/0xd0 [1010.716076]? __kernel_text_address+0x56/0xa0 [ 1010.716084] ? unwind_get_return_address+0x5a/0xa0 [1010.716091]? create_prof_cpu_mask+0x30/0x30 [1010.716098]? arch_stack_walk+0x9e/0xf0 [1010.716106]? stack_trace_save+0x91/0xd0 [1010.716113]? stack_trace_consume_entry+0x170/0x170 [1010.716121]? __lock_acquire+0x15c5/0x5380 [1010.716139]? mark_held_locks+0x9e/0xe0 [1010.716148]? ¿kmem_cache_alloc_trace+0x35f/0x3c0 [1010.716155]? __rtnl_newlink+0x1700/0x1700 [ 1010.716160] rtnl_newlink+0x69/0xa0 [ 1010.716166] rtnetlink_rcv_msg+0x43b/0xc50 [ 1010.716172] ? rtnl_fdb_dump+0x9f0/0x9f0 [1010.716179]? lock_acquire+0x1fe/0x560 [1010.716188]? netlink_deliver_tap+0x12f/0xd50 [ 1010.716196] netlink_rcv_skb+0x14d/0x440 [ 1010.716202] ? rtnl_fdb_dump+0x9f0/0x9f0 [1010.716208]? netlink_ack+0xab0/0xab0 [1010.716213]? netlink_deliver_tap+0x202/0xd50 [1010.716220]? netlink_deliver_tap+0x218/0xd50 [1010.716226]? __virt_addr_valid+0x30b/0x590 [ 1010.716233] netlink_unicast+0x54b/0x800 [ 1010.716240] ? netlink_attachskb+0x870/0x870 [1010.716248]? __check_object_size+0x2de/0x3b0 [ 1010.716254] netlink_sendmsg+0x938/0xe40 [ 1010.716261] ? netlink_unicast+0x800/0x800 [1010.716269]? __import_iovec+0x292/0x510 [ 1010.716276] ? netlink_unicast+0x800/0x800 [ 1010.716284] __sock_sendmsg+0x159/0x190 [ 1010.716290] ____sys_sendmsg+0x712/0x880 [ 1010.716297] ? sock_write_iter+0x3d0/0x3d0 [1010.716304]? __ia32_sys_recvmmsg+0x270/0x270 [1010.716309]? lock_acquire+0x1fe/0x560 [1010.716315]? Drain_array_locked+0x90/0x90 [ 1010.716324] ___sys_sendmsg+0xf8/0x170 [ 1010.716331] ? sendmsg_copy_msghdr+0x170/0x170 [1010.716337]? lockdep_init_map ---truncado---