CVE-2024-53170

Estado: ModificadaAlta (7.8)—

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

block: fix uaf for flush rq while iterating tags

blk_mq_clear_flush_rq_mapping() is not called during scsi probe, by checking blk_queue_init_done(). However, QUEUE_FLAG_INIT_DONE is cleared in del_gendisk by commit aec89dc5d421 ("block: keep q_usage_counter in atomic mode after del_gendisk"), hence for disk like scsi, following blk_mq_destroy_queue() will not clear flush rq from tags->rqs[] as well, cause following uaf that is found by our syzkaller for v6.6:

Detalles técnicos trazas, registros y código del informe original

==================================================================
BUG: KASAN: slab-use-after-free in blk_mq_find_and_get_req+0x16e/0x1a0 block/blk-mq-tag.c:261
Read of size 4 at addr ffff88811c969c20 by task kworker/1:2H/224909

CPU: 1 PID: 224909 Comm: kworker/1:2H Not tainted 6.6.0-ga836a5060850 #32
Workqueue: kblockd blk_mq_timeout_work
Call Trace:

__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x91/0xf0 lib/dump_stack.c:106
print_address_description.constprop.0+0x66/0x300 mm/kasan/report.c:364
print_report+0x3e/0x70 mm/kasan/report.c:475
kasan_report+0xb8/0xf0 mm/kasan/report.c:588
blk_mq_find_and_get_req+0x16e/0x1a0 block/blk-mq-tag.c:261
bt_iter block/blk-mq-tag.c:288 [inline]
__sbitmap_for_each_set include/linux/sbitmap.h:295 [inline]
sbitmap_for_each_set include/linux/sbitmap.h:316 [inline]
bt_for_each+0x455/0x790 block/blk-mq-tag.c:325
blk_mq_queue_tag_busy_iter+0x320/0x740 block/blk-mq-tag.c:534
blk_mq_timeout_work+0x1a3/0x7b0 block/blk-mq.c:1673
process_one_work+0x7c4/0x1450 kernel/workqueue.c:2631
process_scheduled_works kernel/workqueue.c:2704 [inline]
worker_thread+0x804/0xe40 kernel/workqueue.c:2785
kthread+0x346/0x450 kernel/kthread.c:388
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:293

Allocated by task 942:
kasan_save_stack+0x22/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc mm/kasan/common.c:383 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:380
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc_node+0x69/0x170 mm/slab_common.c:1014
kmalloc_node include/linux/slab.h:620 [inline]
kzalloc_node include/linux/slab.h:732 [inline]
blk_alloc_flush_queue+0x144/0x2f0 block/blk-flush.c:499
blk_mq_alloc_hctx+0x601/0x940 block/blk-mq.c:3788
blk_mq_alloc_and_init_hctx+0x27f/0x330 block/blk-mq.c:4261
blk_mq_realloc_hw_ctxs+0x488/0x5e0 block/blk-mq.c:4294
blk_mq_init_allocated_queue+0x188/0x860 block/blk-mq.c:4350
blk_mq_init_queue_data block/blk-mq.c:4166 [inline]
blk_mq_init_queue+0x8d/0x100 block/blk-mq.c:4176
scsi_alloc_sdev+0x843/0xd50 drivers/scsi/scsi_scan.c:335
scsi_probe_and_add_lun+0x77c/0xde0 drivers/scsi/scsi_scan.c:1189
__scsi_scan_target+0x1fc/0x5a0 drivers/scsi/scsi_scan.c:1727
scsi_scan_channel drivers/scsi/scsi_scan.c:1815 [inline]
scsi_scan_channel+0x14b/0x1e0 drivers/scsi/scsi_scan.c:1791
scsi_scan_host_selected+0x2fe/0x400 drivers/scsi/scsi_scan.c:1844
scsi_scan+0x3a0/0x3f0 drivers/scsi/scsi_sysfs.c:151
store_scan+0x2a/0x60 drivers/scsi/scsi_sysfs.c:191
dev_attr_store+0x5c/0x90 drivers/base/core.c:2388
sysfs_kf_write+0x11c/0x170 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x3fc/0x610 fs/kernfs/file.c:338
call_write_iter include/linux/fs.h:2083 [inline]
new_sync_write+0x1b4/0x2d0 fs/read_write.c:493
vfs_write+0x76c/0xb00 fs/read_write.c:586
ksys_write+0x127/0x250 fs/read_write.c:639
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x70/0x120 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x78/0xe2

Freed by task 244687:
kasan_save_stack+0x22/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x50 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
__kasan_slab_free+0x12a/0x1b0 mm/kasan/common.c:244
kasan_slab_free include/linux/kasan.h:164 [in
---truncated---

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.24%
Percentil entre todas las CVEs puntuadas: 14
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %

Vulnerabilidad local (AV:L/PR:L) de use-after-free en kernel Linux que permite escalada de privilegios y ejecución de código arbitrario desde acceso local sin interacción del usuario.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416
CWE-416

Referencias

JSON original (NVD)

Mostrar

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            {
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: fix uaf for flush rq while iterating tags\n\nblk_mq_clear_flush_rq_mapping() is not called during scsi probe, by\nchecking blk_queue_init_done(). However, QUEUE_FLAG_INIT_DONE is cleared\nin del_gendisk by commit aec89dc5d421 (\"block: keep q_usage_counter in\natomic mode after del_gendisk\"), hence for disk like scsi, following\nblk_mq_destroy_queue() will not clear flush rq from tags->rqs[] as well,\ncause following uaf that is found by our syzkaller for v6.6:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in blk_mq_find_and_get_req+0x16e/0x1a0 block/blk-mq-tag.c:261\nRead of size 4 at addr ffff88811c969c20 by task kworker/1:2H/224909\n\nCPU: 1 PID: 224909 Comm: kworker/1:2H Not tainted 6.6.0-ga836a5060850 #32\nWorkqueue: kblockd blk_mq_timeout_work\nCall Trace:\n\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x91/0xf0 lib/dump_stack.c:106\nprint_address_description.constprop.0+0x66/0x300 mm/kasan/report.c:364\nprint_report+0x3e/0x70 mm/kasan/report.c:475\nkasan_report+0xb8/0xf0 mm/kasan/report.c:588\nblk_mq_find_and_get_req+0x16e/0x1a0 block/blk-mq-tag.c:261\nbt_iter block/blk-mq-tag.c:288 [inline]\n__sbitmap_for_each_set include/linux/sbitmap.h:295 [inline]\nsbitmap_for_each_set include/linux/sbitmap.h:316 [inline]\nbt_for_each+0x455/0x790 block/blk-mq-tag.c:325\nblk_mq_queue_tag_busy_iter+0x320/0x740 block/blk-mq-tag.c:534\nblk_mq_timeout_work+0x1a3/0x7b0 block/blk-mq.c:1673\nprocess_one_work+0x7c4/0x1450 kernel/workqueue.c:2631\nprocess_scheduled_works kernel/workqueue.c:2704 [inline]\nworker_thread+0x804/0xe40 kernel/workqueue.c:2785\nkthread+0x346/0x450 kernel/kthread.c:388\nret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147\nret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:293\n\nAllocated by task 942:\nkasan_save_stack+0x22/0x50 mm/kasan/common.c:45\nkasan_set_track+0x25/0x30 mm/kasan/common.c:52\n____kasan_kmalloc mm/kasan/common.c:374 [inline]\n__kasan_kmalloc mm/kasan/common.c:383 [inline]\n__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:380\nkasan_kmalloc include/linux/kasan.h:198 [inline]\n__do_kmalloc_node mm/slab_common.c:1007 [inline]\n__kmalloc_node+0x69/0x170 mm/slab_common.c:1014\nkmalloc_node include/linux/slab.h:620 [inline]\nkzalloc_node include/linux/slab.h:732 [inline]\nblk_alloc_flush_queue+0x144/0x2f0 block/blk-flush.c:499\nblk_mq_alloc_hctx+0x601/0x940 block/blk-mq.c:3788\nblk_mq_alloc_and_init_hctx+0x27f/0x330 block/blk-mq.c:4261\nblk_mq_realloc_hw_ctxs+0x488/0x5e0 block/blk-mq.c:4294\nblk_mq_init_allocated_queue+0x188/0x860 block/blk-mq.c:4350\nblk_mq_init_queue_data block/blk-mq.c:4166 [inline]\nblk_mq_init_queue+0x8d/0x100 block/blk-mq.c:4176\nscsi_alloc_sdev+0x843/0xd50 drivers/scsi/scsi_scan.c:335\nscsi_probe_and_add_lun+0x77c/0xde0 drivers/scsi/scsi_scan.c:1189\n__scsi_scan_target+0x1fc/0x5a0 drivers/scsi/scsi_scan.c:1727\nscsi_scan_channel drivers/scsi/scsi_scan.c:1815 [inline]\nscsi_scan_channel+0x14b/0x1e0 drivers/scsi/scsi_scan.c:1791\nscsi_scan_host_selected+0x2fe/0x400 drivers/scsi/scsi_scan.c:1844\nscsi_scan+0x3a0/0x3f0 drivers/scsi/scsi_sysfs.c:151\nstore_scan+0x2a/0x60 drivers/scsi/scsi_sysfs.c:191\ndev_attr_store+0x5c/0x90 drivers/base/core.c:2388\nsysfs_kf_write+0x11c/0x170 fs/sysfs/file.c:136\nkernfs_fop_write_iter+0x3fc/0x610 fs/kernfs/file.c:338\ncall_write_iter include/linux/fs.h:2083 [inline]\nnew_sync_write+0x1b4/0x2d0 fs/read_write.c:493\nvfs_write+0x76c/0xb00 fs/read_write.c:586\nksys_write+0x127/0x250 fs/read_write.c:639\ndo_syscall_x64 arch/x86/entry/common.c:51 [inline]\ndo_syscall_64+0x70/0x120 arch/x86/entry/common.c:81\nentry_SYSCALL_64_after_hwframe+0x78/0xe2\n\nFreed by task 244687:\nkasan_save_stack+0x22/0x50 mm/kasan/common.c:45\nkasan_set_track+0x25/0x30 mm/kasan/common.c:52\nkasan_save_free_info+0x2b/0x50 mm/kasan/generic.c:522\n____kasan_slab_free mm/kasan/common.c:236 [inline]\n__kasan_slab_free+0x12a/0x1b0 mm/kasan/common.c:244\nkasan_slab_free include/linux/kasan.h:164 [in\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: corregir uaf para flush rq mientras se itera etiquetas blk_mq_clear_flush_rq_mapping() no se llama durante la sonda scsi, al verificar blk_queue_init_done(). Sin embargo, QUEUE_FLAG_INIT_DONE se borra en del_gendisk por el commit aec89dc5d421 (\"bloque: mantener q_usage_counter en modo atómico después de del_gendisk\"), por lo tanto, para discos como scsi, seguir blk_mq_destroy_queue() tampoco borrará el flush rq de tags-&gt;rqs[], debido al siguiente uaf que nuestro syzkaller encuentra para v6.6: ===================================================================== ERROR: KASAN: slab-use-after-free en blk_mq_find_and_get_req+0x16e/0x1a0 block/blk-mq-tag.c:261 Lectura de tamaño 4 en la dirección ffff88811c969c20 por la tarea kworker/1:2H/224909 CPU: 1 PID: 224909 Comm: kworker/1:2H No contaminado 6.6.0-ga836a5060850 #32 Cola de trabajo: kblockd blk_mq_timeout_work Seguimiento de llamadas: __dump_stack lib/dump_stack.c:88 [en línea] dump_stack_lvl+0x91/0xf0 lib/dump_stack.c:106 print_address_description.constprop.0+0x66/0x300 mm/kasan/report.c:364 print_report+0x3e/0x70 mm/kasan/report.c:475 kasan_report+0xb8/0xf0 mm/kasan/report.c:588 blk_mq_find_and_get_req+0x16e/0x1a0 bloque/blk-mq-tag.c:261 bt_iter bloque/blk-mq-tag.c:288 [en línea] __sbitmap_for_each_set include/linux/sbitmap.h:295 [en línea] sbitmap_for_each_set include/linux/sbitmap.h:316 [en línea] bt_for_each+0x455/0x790 bloque/blk-mq-tag.c:325 blk_mq_queue_tag_busy_iter+0x320/0x740 bloque/blk-mq-tag.c:534 blk_mq_timeout_work+0x1a3/0x7b0 bloque/blk-mq.c:1673 proceso_uno_trabajo+0x7c4/0x1450 kernel/workqueue.c:2631 proceso_trabajos_programados kernel/workqueue.c:2704 [en línea] subproceso_trabajador+0x804/0xe40 kernel/workqueue.c:2785 subproceso_k+0x346/0x450 kernel/kthread.c:388 ret_de_bifurcación+0x4d/0x80 arch/x86/kernel/process.c:147 ret_de_bifurcación_asm+0x1b/0x30 arch/x86/entry/entry_64.S:293 Asignado por la tarea 942: pila_guardada_kasan+0x22/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [en línea] __kasan_kmalloc mm/kasan/common.c:383 [en línea] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:198 [en línea] __do_kmalloc_node mm/slab_common.c:1007 [en línea] __kmalloc_node+0x69/0x170 mm/slab_common.c:1014 kmalloc_node include/linux/slab.h:620 [en línea] kzalloc_node include/linux/slab.h:732 [en línea] blk_alloc_flush_queue+0x144/0x2f0 bloque/blk-flush.c:499 blk_mq_alloc_hctx+0x601/0x940 bloque/blk-mq.c:3788 blk_mq_alloc_and_init_hctx+0x27f/0x330 bloque/blk-mq.c:4261 blk_mq_realloc_hw_ctxs+0x488/0x5e0 bloque/blk-mq.c:4294 blk_mq_init_allocated_queue+0x188/0x860 bloque/blk-mq.c:4350 blk_mq_init_queue_data bloque/blk-mq.c:4166 [en línea] blk_mq_init_queue+0x8d/0x100 block/blk-mq.c:4176 scsi_alloc_sdev+0x843/0xd50 drivers/scsi/scsi_scan.c:335 scsi_probe_and_add_lun+0x77c/0xde0 drivers/scsi/scsi_scan.c:1189 __scsi_scan_target+0x1fc/0x5a0 drivers/scsi/scsi_scan.c:1727 scsi_scan_channel drivers/scsi/scsi_scan.c:1815 [en línea] scsi_scan_channel+0x14b/0x1e0 drivers/scsi/scsi_scan.c:1791 scsi_scan_host_selected+0x2fe/0x400 drivers/scsi/scsi_scan.c:1844 scsi_scan+0x3a0/0x3f0 drivers/scsi/scsi_sysfs.c:151 store_scan+0x2a/0x60 drivers/scsi/scsi_sysfs.c:191 dev_attr_store+0x5c/0x90 drivers/base/core.c:2388 sysfs_kf_write+0x11c/0x170 fs/sysfs/file.c:136 kernfs_fop_write_iter+0x3fc/0x610 fs/kernfs/file.c:338 call_write_iter include/linux/fs.h:2083 [en línea] new_sync_write+0x1b4/0x2d0 fs/read_write.c:493 vfs_write+0x76c/0xb00 fs/read_write.c:586 ksys_write+0x127/0x250 fs/read_write.c:639 do_syscall_x64 arch/x86/entry/common.c:51 [en línea] do_syscall_64+0x70/0x120 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x78/0xe2 Liberado por la tarea 244687: kasan_save_stack+0x22/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x50 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 --truncado---"
    }
  ],
  "lastModified": "2026-07-14T13:17:12.530",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A482F6D5-4DB0-4611-AF23-1D568CE9F2BF",
              "versionEndExcluding": "6.11.11",
              "versionStartIncluding": "5.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D8882B1B-2ABC-4838-AC1D-DBDBB5764776",
              "versionEndExcluding": "6.12.2",
              "versionStartIncluding": "6.12"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}