CVE-2024-26862 in Linux
Resumen
por VulDB • 2026-07-03
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
packet: anotar las condiciones de carrera (data-races) alrededor de ignore_outgoing
ignore_outgoing se lee sin bloqueo desde dev_queue_xmit_nit() y packet_getsockopt().
Se han añadido anotaciones READ_ONCE()/WRITE_ONCE() apropiadas.
syzbot informó lo siguiente:
BUG: KCSAN: data-race in dev_queue_xmit_nit / packet_setsockopt
escritura en 0xffff888107804542 de 1 byte por la tarea 22618 en el cpu 0: packet_setsockopt+0xd83/0xfd0 net/packet/af_packet.c:4003 do_sock_setsockopt net/socket.c:2311 [inline]
__sys_setsockopt+0x1d8/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline]
__se_sys_setsockopt net/socket.c:2340 [inline]
__x64_sys_setsockopt+0x66/0x80 net/socket.c:2340 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x6d/0x75
lectura en 0xffff888107804542 de 1 byte por la tarea 27 en el cpu 1: dev_queue_xmit_nit+0x82/0x620 net/core/dev.c:2248 xmit_one net/core/dev.c:3527 [inline]
dev_hard_start_xmit+0xcc/0x3f0 net/core/dev.c:3547 __dev_queue_xmit+0xf24/0x1dd0 net/core/dev.c:4335 dev_queue_xmit include/linux/netdevice.h:3091 [inline]
batadv_send_skb_packet+0x264/0x300 net/batman-adv/send.c:108 batadv_send_broadcast_skb+0x24/0x30 net/batman-adv/send.c:127 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x3f0/0x4b0 net/batman-adv/bat_iv_ogm.c:1700 process_one_work kernel/workqueue.c:3254 [inline]
process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335 worker_thread+0x526/0x730 kernel/workqueue.c:3416 kthread+0x1d1/0x210 kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
valor cambiado: 0x00 -> 0x01
Informado por Kernel Concurrency Sanitizer en: CPU: 1 PID: 27 Comm: kworker/u8:1 Tainted: G W 6.8.0-syzkaller-08073-g480e035fc4c7 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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