CVE-2024-26871

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrige la desreferencia del puntero NULL en f2fs_submit_page_write() ERROR: desreferencia del puntero NULL del kernel, dirección: 0000000000000014 RIP: 0010:f2fs_submit_page_write+0x6cf/0x780 [f2fs] Seguimiento de llamadas: ? show_regs+0x6e/0x80? __morir+0x29/0x70 ? page_fault_oops+0x154/0x4a0? prb_read_valid+0x20/0x30? __irq_work_queue_local+0x39/0xd0 ? irq_work_queue+0x36/0x70? do_user_addr_fault+0x314/0x6c0? exc_page_fault+0x7d/0x190? asm_exc_page_fault+0x2b/0x30? f2fs_submit_page_write+0x6cf/0x780 [f2fs] ? f2fs_submit_page_write+0x736/0x780 [f2fs] do_write_page+0x50/0x170 [f2fs] f2fs_outplace_write_data+0x61/0xb0 [f2fs] f2fs_do_write_data_page+0x3f8/0x660 [f2fs] f2fs_write_single_data_page+0 x5bb/0x7a0 [f2fs] f2fs_write_cache_pages+0x3da/0xbe0 [f2fs] .. Es posible que otros hilos hayan agregado este fio a io->bio y hayan enviado el io->bio antes de ingresar a f2fs_submit_page_write(). En este punto io->bio = NULL. Si is_end_zone_blkaddr(sbi, fio->new_blkaddr) de este fio es verdadero, entonces se produce un error de desreferencia de puntero NULL en bio_get(io->bio). El código original para determinar el final de la zona estaba después de "out:", lo que habría pasado por alto a algún fio que es el final de la zona. Moví este código antes de "omitir:" para asegurarme de que esté hecho para cada fio.

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix NULL pointer dereference in f2fs_submit_page_write() BUG: kernel NULL pointer dereference, address: 0000000000000014 RIP: 0010:f2fs_submit_page_write+0x6cf/0x780 [f2fs] Call Trace: <TASK> ? show_regs+0x6e/0x80 ? __die+0x29/0x70 ? page_fault_oops+0x154/0x4a0 ? prb_read_valid+0x20/0x30 ? __irq_work_queue_local+0x39/0xd0 ? irq_work_queue+0x36/0x70 ? do_user_addr_fault+0x314/0x6c0 ? exc_page_fault+0x7d/0x190 ? asm_exc_page_fault+0x2b/0x30 ? f2fs_submit_page_write+0x6cf/0x780 [f2fs] ? f2fs_submit_page_write+0x736/0x780 [f2fs] do_write_page+0x50/0x170 [f2fs] f2fs_outplace_write_data+0x61/0xb0 [f2fs] f2fs_do_write_data_page+0x3f8/0x660 [f2fs] f2fs_write_single_data_page+0x5bb/0x7a0 [f2fs] f2fs_write_cache_pages+0x3da/0xbe0 [f2fs] ... It is possible that other threads have added this fio to io->bio and submitted the io->bio before entering f2fs_submit_page_write(). At this point io->bio = NULL. If is_end_zone_blkaddr(sbi, fio->new_blkaddr) of this fio is true, then an NULL pointer dereference error occurs at bio_get(io->bio). The original code for determining zone end was after "out:", which would have missed some fio who is zone end. I've moved this code before "skip:" to make sure it's done for each fio.

Ziming Zhang discovered that the DRM driver for VMware Virtual GPU did not properly handle certain error conditions, leading to a NULL pointer dereference. A local attacker could possibly trigger this vulnerability to cause a denial of service. Zheng Wang discovered that the Broadcom FullMAC WLAN driver in the Linux kernel contained a race condition during device removal, leading to a use- after-free vulnerability. A physically proximate attacker could possibly use this to cause a denial of service.