CVE-2025-39691
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: fs/buffer: fix use-after-free when call bh_read() helper There's issue as follows: BUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110 Read of size 8 at addr ffffc9000168f7f8 by task swapper/3/0 CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Call Trace: <IRQ> dump_stack_lvl+0x55/0x70 print_address_description.constprop.0+0x2c/0x390 print_report+0xb4/0x270 kasan_report+0xb8/0xf0 end_buffer_read_sync+0xe3/0x110 end_bio_bh_io_sync+0x56/0x80 blk_update_request+0x30a/0x720 scsi_end_request+0x51/0x2b0 scsi_io_completion+0xe3/0x480 ? scsi_device_unbusy+0x11e/0x160 blk_complete_reqs+0x7b/0x90 handle_softirqs+0xef/0x370 irq_exit_rcu+0xa5/0xd0 sysvec_apic_timer_interrupt+0x6e/0x90 </IRQ> Above issue happens when do ntfs3 filesystem mount, issue may happens as follows: mount IRQ ntfs_fill_super read_cache_page do_read_cache_folio filemap_read_folio mpage_read_folio do_mpage_readpage ntfs_get_block_vbo bh_read submit_bh wait_on_buffer(bh); blk_complete_reqs scsi_io_completion scsi_end_request blk_update_request end_bio_bh_io_sync end_buffer_read_sync __end_buffer_read_notouch unlock_buffer wait_on_buffer(bh);--> return will return to caller put_bh --> trigger stack-out-of-bounds In the mpage_read_folio() function, the stack variable 'map_bh' is passed to ntfs_get_block_vbo(). Once unlock_buffer() unlocks and wait_on_buffer() returns to continue processing, the stack variable is likely to be reclaimed. Consequently, during the end_buffer_read_sync() process, calling put_bh() may result in stack overrun. If the bh is not allocated on the stack, it belongs to a folio. Freeing a buffer head which belongs to a folio is done by drop_buffers() which will fail to free buffers which are still locked. So it is safe to call put_bh() before __end_buffer_read_notouch().
View original CVE JSON
{
"id": "CVE-2025-39691",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-09-05T18:15:45.840",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/buffer: fix use-after-free when call bh_read() helper\n\nThere's issue as follows:\nBUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110\nRead of size 8 at addr ffffc9000168f7f8 by task swapper/3/0\nCPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nCall Trace:\n <IRQ>\n dump_stack_lvl+0x55/0x70\n print_address_description.constprop.0+0x2c/0x390\n print_report+0xb4/0x270\n kasan_report+0xb8/0xf0\n end_buffer_read_sync+0xe3/0x110\n end_bio_bh_io_sync+0x56/0x80\n blk_update_request+0x30a/0x720\n scsi_end_request+0x51/0x2b0\n scsi_io_completion+0xe3/0x480\n ? scsi_device_unbusy+0x11e/0x160\n blk_complete_reqs+0x7b/0x90\n handle_softirqs+0xef/0x370\n irq_exit_rcu+0xa5/0xd0\n sysvec_apic_timer_interrupt+0x6e/0x90\n </IRQ>\n\n Above issue happens when do ntfs3 filesystem mount, issue may happens\n as follows:\n mount IRQ\nntfs_fill_super\n read_cache_page\n do_read_cache_folio\n filemap_read_folio\n mpage_read_folio\n\t do_mpage_readpage\n\t ntfs_get_block_vbo\n\t bh_read\n\t submit_bh\n\t wait_on_buffer(bh);\n\t blk_complete_reqs\n\t\t\t\t scsi_io_completion\n\t\t\t\t scsi_end_request\n\t\t\t\t blk_update_request\n\t\t\t\t end_bio_bh_io_sync\n\t\t\t\t\t end_buffer_read_sync\n\t\t\t\t\t __end_buffer_read_notouch\n\t\t\t\t\t unlock_buffer\n\n wait_on_buffer(bh);--> return will return to caller\n\n\t\t\t\t\t put_bh\n\t\t\t\t\t --> trigger stack-out-of-bounds\nIn the mpage_read_folio() function, the stack variable 'map_bh' is\npassed to ntfs_get_block_vbo(). Once unlock_buffer() unlocks and\nwait_on_buffer() returns to continue processing, the stack variable\nis likely to be reclaimed. Consequently, during the end_buffer_read_sync()\nprocess, calling put_bh() may result in stack overrun.\n\nIf the bh is not allocated on the stack, it belongs to a folio. Freeing\na buffer head which belongs to a folio is done by drop_buffers() which\nwill fail to free buffers which are still locked. So it is safe to call\nput_bh() before __end_buffer_read_notouch()."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs/buffer: corrige el uso después de liberación al llamar a la función auxiliar bh_read()\n\nExiste un problema como sigue:\nERROR: KASAN: desbordamiento de pila en end_buffer_read_sync+0xe3/0x110\nLectura de tamaño 8 en la dirección ffffc9000168f7f8 por la tarea swapper/3/0\nCPU: 3 UID: 0 PID: 0 Comm: swapper/3 No contaminado 6.16.0-862.14.0.6.x86_64\nNombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996)\nTraza de llamada:\n <IRQ>\n dump_stack_lvl+0x55/0x70\n print_address_description.constprop.0+0x2c/0x390\n print_report+0xb4/0x270\n kasan_report+0xb8/0xf0\n end_buffer_read_sync+0xe3/0x110\n end_bio_bh_io_sync+0x56/0x80\n blk_update_request+0x30a/0x720\n scsi_end_request+0x51/0x2b0\n scsi_io_completion+0xe3/0x480\n ? scsi_device_unbusy+0x11e/0x160\n blk_complete_reqs+0x7b/0x90\n handle_softirqs+0xef/0x370\n irq_exit_rcu+0xa5/0xd0\n sysvec_apic_timer_interrupt+0x6e/0x90\n </IRQ>\n\nEl problema anterior ocurre al montar el sistema de archivos ntfs3, el problema puede ocurrir de la siguiente manera:\n montar IRQ\nntfs_fill_super\n read_cache_page\n do_read_cache_folio\n filemap_read_folio\n mpage_read_folio\n\t do_mpage_readpage\n\t ntfs_get_block_vbo\n\t bh_read\n\t submit_bh\n\t wait_on_buffer(bh);\n\t blk_complete_reqs\n\t\t\t\t scsi_io_completion\n\t\t\t\t scsi_end_request\n\t\t\t\t blk_update_request\n\t\t\t\t end_bio_bh_io_sync\n\t\t\t\t\t end_buffer_read_sync\n\t\t\t\t\t __end_buffer_read_notouch\n\t\t\t\t\t unlock_buffer\n\n wait_on_buffer(bh);--> el retorno volverá al llamador\n\n\t\t\t\t\t put_bh\n\t\t\t\t\t --> desencadena el desbordamiento de pila\nEn la función mpage_read_folio(), la variable de pila map_bh se pasa a ntfs_get_block_vbo(). Una vez que unlock_buffer() desbloquea y wait_on_buffer() regresa para continuar el procesamiento, es probable que la variable de pila sea reclamada. En consecuencia, durante el proceso de end_buffer_read_sync(), llamar a put_bh() puede resultar en un desbordamiento de pila.\n\nSi el bh no se asigna en la pila, pertenece a un folio. La liberación de una cabecera de búfer que pertenece a un folio se realiza mediante drop_buffers(), que fallará al liberar los búferes que aún están bloqueados. Por lo tanto, es seguro llamar a put_bh() antes de __end_buffer_read_notouch()."
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