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CVE-2021-47435 (GCVE-0-2021-47435)

Vulnerability from cvelistv5 – Published: 2024-05-22 06:19 – Updated: 2026-05-11 13:54
VLAI
Title
dm: fix mempool NULL pointer race when completing IO
Summary
In the Linux kernel, the following vulnerability has been resolved: dm: fix mempool NULL pointer race when completing IO dm_io_dec_pending() calls end_io_acct() first and will then dec md in-flight pending count. But if a task is swapping DM table at same time this can result in a crash due to mempool->elements being NULL: task1 task2 do_resume ->do_suspend ->dm_wait_for_completion bio_endio ->clone_endio ->dm_io_dec_pending ->end_io_acct ->wakeup task1 ->dm_swap_table ->__bind ->__bind_mempools ->bioset_exit ->mempool_exit ->free_io [ 67.330330] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 ...... [ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO) [ 67.330510] pc : mempool_free+0x70/0xa0 [ 67.330515] lr : mempool_free+0x4c/0xa0 [ 67.330520] sp : ffffff8008013b20 [ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004 [ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8 [ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800 [ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800 [ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80 [ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c [ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd [ 67.330563] x15: 000000000093b41e x14: 0000000000000010 [ 67.330569] x13: 0000000000007f7a x12: 0000000034155555 [ 67.330574] x11: 0000000000000001 x10: 0000000000000001 [ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000 [ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a [ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001 [ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8 [ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970 [ 67.330609] Call trace: [ 67.330616] mempool_free+0x70/0xa0 [ 67.330627] bio_put+0xf8/0x110 [ 67.330638] dec_pending+0x13c/0x230 [ 67.330644] clone_endio+0x90/0x180 [ 67.330649] bio_endio+0x198/0x1b8 [ 67.330655] dec_pending+0x190/0x230 [ 67.330660] clone_endio+0x90/0x180 [ 67.330665] bio_endio+0x198/0x1b8 [ 67.330673] blk_update_request+0x214/0x428 [ 67.330683] scsi_end_request+0x2c/0x300 [ 67.330688] scsi_io_completion+0xa0/0x710 [ 67.330695] scsi_finish_command+0xd8/0x110 [ 67.330700] scsi_softirq_done+0x114/0x148 [ 67.330708] blk_done_softirq+0x74/0xd0 [ 67.330716] __do_softirq+0x18c/0x374 [ 67.330724] irq_exit+0xb4/0xb8 [ 67.330732] __handle_domain_irq+0x84/0xc0 [ 67.330737] gic_handle_irq+0x148/0x1b0 [ 67.330744] el1_irq+0xe8/0x190 [ 67.330753] lpm_cpuidle_enter+0x4f8/0x538 [ 67.330759] cpuidle_enter_state+0x1fc/0x398 [ 67.330764] cpuidle_enter+0x18/0x20 [ 67.330772] do_idle+0x1b4/0x290 [ 67.330778] cpu_startup_entry+0x20/0x28 [ 67.330786] secondary_start_kernel+0x160/0x170 Fix this by: 1) Establishing pointers to 'struct dm_io' members in dm_io_dec_pending() so that they may be passed into end_io_acct() _after_ free_io() is called. 2) Moving end_io_acct() after free_io().
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-22 18:48 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < 9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < d35aef9c60d310eff3eaddacce301efe877e2b7c (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < 9e07272cca2ed76f7f6073f4444b1143828c8d87 (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < ad1393b92e5059218d055bfec8f4946d85ad04c4 (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < d29c78d3f9c5d2604548c1065bf1ec212728ea61 (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < 6e506f07c5b561d673dd0b0d8f7f420cc48024fb (git)
Affected: 6a8736d10cb413be95ea443ba40f25c93f4ef9b2 , < d208b89401e073de986dc891037c5a668f5d5d95 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.37
Unaffected: 0 , < 2.6.37 (semver)
Unaffected: 4.9.313 , ≤ 4.9.* (semver)
Unaffected: 4.14.278 , ≤ 4.14.* (semver)
Unaffected: 4.19.242 , ≤ 4.19.* (semver)
Unaffected: 5.4.193 , ≤ 5.4.* (semver)
Unaffected: 5.10.113 , ≤ 5.10.* (semver)
Unaffected: 5.14.14 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix mempool NULL pointer race when completing IO\n\ndm_io_dec_pending() calls end_io_acct() first and will then dec md\nin-flight pending count. But if a task is swapping DM table at same\ntime this can result in a crash due to mempool-\u003eelements being NULL:\n\ntask1                             task2\ndo_resume\n -\u003edo_suspend\n  -\u003edm_wait_for_completion\n                                  bio_endio\n\t\t\t\t   -\u003eclone_endio\n\t\t\t\t    -\u003edm_io_dec_pending\n\t\t\t\t     -\u003eend_io_acct\n\t\t\t\t      -\u003ewakeup task1\n -\u003edm_swap_table\n  -\u003e__bind\n   -\u003e__bind_mempools\n    -\u003ebioset_exit\n     -\u003emempool_exit\n                                     -\u003efree_io\n\n[ 67.330330] Unable to handle kernel NULL pointer dereference at\nvirtual address 0000000000000000\n......\n[ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO)\n[ 67.330510] pc : mempool_free+0x70/0xa0\n[ 67.330515] lr : mempool_free+0x4c/0xa0\n[ 67.330520] sp : ffffff8008013b20\n[ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004\n[ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8\n[ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800\n[ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800\n[ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80\n[ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c\n[ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd\n[ 67.330563] x15: 000000000093b41e x14: 0000000000000010\n[ 67.330569] x13: 0000000000007f7a x12: 0000000034155555\n[ 67.330574] x11: 0000000000000001 x10: 0000000000000001\n[ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000\n[ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a\n[ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001\n[ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8\n[ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970\n[ 67.330609] Call trace:\n[ 67.330616] mempool_free+0x70/0xa0\n[ 67.330627] bio_put+0xf8/0x110\n[ 67.330638] dec_pending+0x13c/0x230\n[ 67.330644] clone_endio+0x90/0x180\n[ 67.330649] bio_endio+0x198/0x1b8\n[ 67.330655] dec_pending+0x190/0x230\n[ 67.330660] clone_endio+0x90/0x180\n[ 67.330665] bio_endio+0x198/0x1b8\n[ 67.330673] blk_update_request+0x214/0x428\n[ 67.330683] scsi_end_request+0x2c/0x300\n[ 67.330688] scsi_io_completion+0xa0/0x710\n[ 67.330695] scsi_finish_command+0xd8/0x110\n[ 67.330700] scsi_softirq_done+0x114/0x148\n[ 67.330708] blk_done_softirq+0x74/0xd0\n[ 67.330716] __do_softirq+0x18c/0x374\n[ 67.330724] irq_exit+0xb4/0xb8\n[ 67.330732] __handle_domain_irq+0x84/0xc0\n[ 67.330737] gic_handle_irq+0x148/0x1b0\n[ 67.330744] el1_irq+0xe8/0x190\n[ 67.330753] lpm_cpuidle_enter+0x4f8/0x538\n[ 67.330759] cpuidle_enter_state+0x1fc/0x398\n[ 67.330764] cpuidle_enter+0x18/0x20\n[ 67.330772] do_idle+0x1b4/0x290\n[ 67.330778] cpu_startup_entry+0x20/0x28\n[ 67.330786] secondary_start_kernel+0x160/0x170\n\nFix this by:\n1) Establishing pointers to \u0027struct dm_io\u0027 members in\ndm_io_dec_pending() so that they may be passed into end_io_acct()\n_after_ free_io() is called.\n2) Moving end_io_acct() after free_io()."
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    "fkie_nvd": {
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm: fix mempool NULL pointer race when completing IO\\n\\ndm_io_dec_pending() calls end_io_acct() first and will then dec md\\nin-flight pending count. But if a task is swapping DM table at same\\ntime this can result in a crash due to mempool-\u003eelements being NULL:\\n\\ntask1                             task2\\ndo_resume\\n -\u003edo_suspend\\n  -\u003edm_wait_for_completion\\n                                  bio_endio\\n\\t\\t\\t\\t   -\u003eclone_endio\\n\\t\\t\\t\\t    -\u003edm_io_dec_pending\\n\\t\\t\\t\\t     -\u003eend_io_acct\\n\\t\\t\\t\\t      -\u003ewakeup task1\\n -\u003edm_swap_table\\n  -\u003e__bind\\n   -\u003e__bind_mempools\\n    -\u003ebioset_exit\\n     -\u003emempool_exit\\n                                     -\u003efree_io\\n\\n[ 67.330330] Unable to handle kernel NULL pointer dereference at\\nvirtual address 0000000000000000\\n......\\n[ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO)\\n[ 67.330510] pc : mempool_free+0x70/0xa0\\n[ 67.330515] lr : mempool_free+0x4c/0xa0\\n[ 67.330520] sp : ffffff8008013b20\\n[ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004\\n[ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8\\n[ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800\\n[ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800\\n[ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80\\n[ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c\\n[ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd\\n[ 67.330563] x15: 000000000093b41e x14: 0000000000000010\\n[ 67.330569] x13: 0000000000007f7a x12: 0000000034155555\\n[ 67.330574] x11: 0000000000000001 x10: 0000000000000001\\n[ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000\\n[ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a\\n[ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001\\n[ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8\\n[ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970\\n[ 67.330609] Call trace:\\n[ 67.330616] mempool_free+0x70/0xa0\\n[ 67.330627] bio_put+0xf8/0x110\\n[ 67.330638] dec_pending+0x13c/0x230\\n[ 67.330644] clone_endio+0x90/0x180\\n[ 67.330649] bio_endio+0x198/0x1b8\\n[ 67.330655] dec_pending+0x190/0x230\\n[ 67.330660] clone_endio+0x90/0x180\\n[ 67.330665] bio_endio+0x198/0x1b8\\n[ 67.330673] blk_update_request+0x214/0x428\\n[ 67.330683] scsi_end_request+0x2c/0x300\\n[ 67.330688] scsi_io_completion+0xa0/0x710\\n[ 67.330695] scsi_finish_command+0xd8/0x110\\n[ 67.330700] scsi_softirq_done+0x114/0x148\\n[ 67.330708] blk_done_softirq+0x74/0xd0\\n[ 67.330716] __do_softirq+0x18c/0x374\\n[ 67.330724] irq_exit+0xb4/0xb8\\n[ 67.330732] __handle_domain_irq+0x84/0xc0\\n[ 67.330737] gic_handle_irq+0x148/0x1b0\\n[ 67.330744] el1_irq+0xe8/0x190\\n[ 67.330753] lpm_cpuidle_enter+0x4f8/0x538\\n[ 67.330759] cpuidle_enter_state+0x1fc/0x398\\n[ 67.330764] cpuidle_enter+0x18/0x20\\n[ 67.330772] do_idle+0x1b4/0x290\\n[ 67.330778] cpu_startup_entry+0x20/0x28\\n[ 67.330786] secondary_start_kernel+0x160/0x170\\n\\nFix this by:\\n1) Establishing pointers to \u0027struct dm_io\u0027 members in\\ndm_io_dec_pending() so that they may be passed into end_io_acct()\\n_after_ free_io() is called.\\n2) Moving end_io_acct() after free_io().\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: dm: corrige la ejecuci\\u00f3n del puntero NULL de mempool al completar IO dm_io_dec_pending() llama a end_io_acct() primero y luego dec md en vuelo conteo pendiente. Pero si una tarea intercambia la tabla DM al mismo tiempo, esto puede provocar un bloqueo debido a que mempool-\u0026gt;elementos son NULL: tarea1 tarea2 do_resume -\u0026gt;do_suspend -\u0026gt;dm_wait_for_completion bio_endio -\u0026gt;clone_endio -\u0026gt;dm_io_dec_pending -\u0026gt;end_io_acct -\u0026gt;wakeup task1 - \u0026gt;dm_swap_table -\u0026gt;__bind -\u0026gt;__bind_mempools -\u0026gt;bioset_exit -\u0026gt;mempool_exit -\u0026gt;free_io [67.330330] No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\\u00f3n virtual 00000000000000000 ...... [67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO ) [67.330510] pc: mempool_free+0x70/0xa0 [67.330515] lr: mempool_free+0x4c/0xa0 [67.330520] sp: ffffff8008013b20 [67.330524] x29: ffffff8008013b20 x28: 000000000000004 [ 67.330530] x27: fffffa8c2ff40a0 x26: 00000000ffff1cc8 [ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800 [ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800 [ 67.330547] x21: 00000000ffff1cc8 x20: 1304d80 [ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c [ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd [ 67.330563] 000000000093b41e x14: 0000000000000010 [ 67.330569] x13: 0000000000007f7a x12: 0000000034155555 [ 67.330574] x11: 00000000000000001 x10: 0000000000000001 [ 67.330579] x9 : 0000000000000000 x8: 0000000000000000 [67.330585] x7: 0000000000000000 x6: ffffff80148b5c1a [67.330590] x5: ffffff8008013ae0 x4: 000000001 [67.330596] x3: ffffff80080139c8 x2: ffffff801083bab8 [67.330601] x1: 0000000000000000 x0: ffffffdada34c970 [67.330609] Rastreo de llamadas: [67.330616] mempool_free+0x70/0xa0 [67.330627] 8/0x110 [67.330638] dec_pending+0x13c/0x230 [67.330644] clone_endio+0x90/0x180 [ 67.330649] bio_endio+0x198/0x1b8 [ 67.330655] dec_pending+0x190/0x230 [ 67.330660] clone_endio+0x90/0x180 [ 67.330665] bio_endio+0x198/0x1b8 [ 67.330673 ] blk_update_request+0x214/0x428 [ 67.330683] scsi_end_request+0x2c/0x300 [ 67.330688 ] scsi_io_completion+0xa0/0x710 [ 67.330695] scsi_finish_command+0xd8/0x110 [ 67.330700] scsi_softirq_done+0x114/0x148 [ 67.330708] blk_done_softirq+0x74/0xd0 [ 67.3307 16] __do_softirq+0x18c/0x374 [ 67.330724] irq_exit+0xb4/0xb8 [ 67.330732] __handle_domain_irq +0x84/0xc0 [ 67.330737] gic_handle_irq+0x148/0x1b0 [ 67.330744] el1_irq+0xe8/0x190 [ 67.330753] lpm_cpuidle_enter+0x4f8/0x538 [ 67.330759] +0x1fc/0x398 [ 67.330764] cpuidle_enter+0x18/0x20 [ 67.330772] do_idle+0x1b4 /0x290 [ 67.330778] cpu_startup_entry+0x20/0x28 [ 67.330786] second_start_kernel+0x160/0x170 Solucione este problema de la siguiente manera: 1) Estableciendo punteros a los miembros \u0027struct dm_io\u0027 en dm_io_dec_pending() para que puedan pasarse a end_io_acct() _despu\\u00e9s_ free_io() se llama. 2) Mover end_io_acct() despu\\u00e9s de free_io().\"}]",
      "id": "CVE-2021-47435",
      "lastModified": "2024-11-21T06:36:08.267",
      "published": "2024-05-22T07:15:08.790",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47435\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T07:15:08.790\",\"lastModified\":\"2026-06-17T04:17:27.853\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm: fix mempool NULL pointer race when completing IO\\n\\ndm_io_dec_pending() calls end_io_acct() first and will then dec md\\nin-flight pending count. But if a task is swapping DM table at same\\ntime this can result in a crash due to mempool-\u003eelements being NULL:\\n\\ntask1                             task2\\ndo_resume\\n -\u003edo_suspend\\n  -\u003edm_wait_for_completion\\n                                  bio_endio\\n\\t\\t\\t\\t   -\u003eclone_endio\\n\\t\\t\\t\\t    -\u003edm_io_dec_pending\\n\\t\\t\\t\\t     -\u003eend_io_acct\\n\\t\\t\\t\\t      -\u003ewakeup task1\\n -\u003edm_swap_table\\n  -\u003e__bind\\n   -\u003e__bind_mempools\\n    -\u003ebioset_exit\\n     -\u003emempool_exit\\n                                     -\u003efree_io\\n\\n[ 67.330330] Unable to handle kernel NULL pointer dereference at\\nvirtual address 0000000000000000\\n......\\n[ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO)\\n[ 67.330510] pc : mempool_free+0x70/0xa0\\n[ 67.330515] lr : mempool_free+0x4c/0xa0\\n[ 67.330520] sp : ffffff8008013b20\\n[ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004\\n[ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8\\n[ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800\\n[ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800\\n[ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80\\n[ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c\\n[ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd\\n[ 67.330563] x15: 000000000093b41e x14: 0000000000000010\\n[ 67.330569] x13: 0000000000007f7a x12: 0000000034155555\\n[ 67.330574] x11: 0000000000000001 x10: 0000000000000001\\n[ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000\\n[ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a\\n[ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001\\n[ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8\\n[ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970\\n[ 67.330609] Call trace:\\n[ 67.330616] mempool_free+0x70/0xa0\\n[ 67.330627] bio_put+0xf8/0x110\\n[ 67.330638] dec_pending+0x13c/0x230\\n[ 67.330644] clone_endio+0x90/0x180\\n[ 67.330649] bio_endio+0x198/0x1b8\\n[ 67.330655] dec_pending+0x190/0x230\\n[ 67.330660] clone_endio+0x90/0x180\\n[ 67.330665] bio_endio+0x198/0x1b8\\n[ 67.330673] blk_update_request+0x214/0x428\\n[ 67.330683] scsi_end_request+0x2c/0x300\\n[ 67.330688] scsi_io_completion+0xa0/0x710\\n[ 67.330695] scsi_finish_command+0xd8/0x110\\n[ 67.330700] scsi_softirq_done+0x114/0x148\\n[ 67.330708] blk_done_softirq+0x74/0xd0\\n[ 67.330716] __do_softirq+0x18c/0x374\\n[ 67.330724] irq_exit+0xb4/0xb8\\n[ 67.330732] __handle_domain_irq+0x84/0xc0\\n[ 67.330737] gic_handle_irq+0x148/0x1b0\\n[ 67.330744] el1_irq+0xe8/0x190\\n[ 67.330753] lpm_cpuidle_enter+0x4f8/0x538\\n[ 67.330759] cpuidle_enter_state+0x1fc/0x398\\n[ 67.330764] cpuidle_enter+0x18/0x20\\n[ 67.330772] do_idle+0x1b4/0x290\\n[ 67.330778] cpu_startup_entry+0x20/0x28\\n[ 67.330786] secondary_start_kernel+0x160/0x170\\n\\nFix this by:\\n1) Establishing pointers to \u0027struct dm_io\u0027 members in\\ndm_io_dec_pending() so that they may be passed into end_io_acct()\\n_after_ free_io() is called.\\n2) Moving end_io_acct() after free_io().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: dm: corrige la ejecuci\u00f3n del puntero NULL de mempool al completar IO dm_io_dec_pending() llama a end_io_acct() primero y luego dec md en vuelo conteo pendiente. Pero si una tarea intercambia la tabla DM al mismo tiempo, esto puede provocar un bloqueo debido a que mempool-\u0026gt;elementos son NULL: tarea1 tarea2 do_resume -\u0026gt;do_suspend -\u0026gt;dm_wait_for_completion bio_endio -\u0026gt;clone_endio -\u0026gt;dm_io_dec_pending -\u0026gt;end_io_acct -\u0026gt;wakeup task1 - \u0026gt;dm_swap_table -\u0026gt;__bind -\u0026gt;__bind_mempools -\u0026gt;bioset_exit -\u0026gt;mempool_exit -\u0026gt;free_io [67.330330] No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 00000000000000000 ...... [67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO ) [67.330510] pc: mempool_free+0x70/0xa0 [67.330515] lr: mempool_free+0x4c/0xa0 [67.330520] sp: ffffff8008013b20 [67.330524] x29: ffffff8008013b20 x28: 000000000000004 [ 67.330530] x27: fffffa8c2ff40a0 x26: 00000000ffff1cc8 [ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800 [ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800 [ 67.330547] x21: 00000000ffff1cc8 x20: 1304d80 [ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c [ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd [ 67.330563] 000000000093b41e x14: 0000000000000010 [ 67.330569] x13: 0000000000007f7a x12: 0000000034155555 [ 67.330574] x11: 00000000000000001 x10: 0000000000000001 [ 67.330579] x9 : 0000000000000000 x8: 0000000000000000 [67.330585] x7: 0000000000000000 x6: ffffff80148b5c1a [67.330590] x5: ffffff8008013ae0 x4: 000000001 [67.330596] x3: ffffff80080139c8 x2: ffffff801083bab8 [67.330601] x1: 0000000000000000 x0: ffffffdada34c970 [67.330609] Rastreo de llamadas: [67.330616] mempool_free+0x70/0xa0 [67.330627] 8/0x110 [67.330638] dec_pending+0x13c/0x230 [67.330644] clone_endio+0x90/0x180 [ 67.330649] bio_endio+0x198/0x1b8 [ 67.330655] dec_pending+0x190/0x230 [ 67.330660] clone_endio+0x90/0x180 [ 67.330665] bio_endio+0x198/0x1b8 [ 67.330673 ] blk_update_request+0x214/0x428 [ 67.330683] scsi_end_request+0x2c/0x300 [ 67.330688 ] scsi_io_completion+0xa0/0x710 [ 67.330695] scsi_finish_command+0xd8/0x110 [ 67.330700] scsi_softirq_done+0x114/0x148 [ 67.330708] blk_done_softirq+0x74/0xd0 [ 67.3307 16] __do_softirq+0x18c/0x374 [ 67.330724] irq_exit+0xb4/0xb8 [ 67.330732] __handle_domain_irq +0x84/0xc0 [ 67.330737] gic_handle_irq+0x148/0x1b0 [ 67.330744] el1_irq+0xe8/0x190 [ 67.330753] lpm_cpuidle_enter+0x4f8/0x538 [ 67.330759] +0x1fc/0x398 [ 67.330764] cpuidle_enter+0x18/0x20 [ 67.330772] do_idle+0x1b4 /0x290 [ 67.330778] cpu_startup_entry+0x20/0x28 [ 67.330786] second_start_kernel+0x160/0x170 Solucione este problema de la siguiente manera: 1) Estableciendo punteros a los miembros \u0027struct dm_io\u0027 en dm_io_dec_pending() para que puedan pasarse a end_io_acct() _despu\u00e9s_ free_io() se llama. 2) Mover end_io_acct() despu\u00e9s de free_io().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/md/dm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\",\"lessThan\":\"9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\",\"lessThan\":\"d35aef9c60d310eff3eaddacce301efe877e2b7c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\",\"lessThan\":\"9e07272cca2ed76f7f6073f4444b1143828c8d87\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\",\"lessThan\":\"ad1393b92e5059218d055bfec8f4946d85ad04c4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\",\"lessThan\":\"d29c78d3f9c5d2604548c1065bf1ec212728ea61\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\",\"lessThan\":\"6e506f07c5b561d673dd0b0d8f7f420cc48024fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6a8736d10cb413be95ea443ba40f25c93f4ef9b2\",\"lessThan\":\"d208b89401e073de986dc891037c5a668f5d5d95\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/md/dm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.37\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.37\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.313\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.278\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.242\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.193\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.113\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.14.14\",\"lessThanOrEqual\":\"5.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-05-22T18:48:43.435062Z\",\"id\":\"CVE-2021-47435\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T06:26:24+00:00",
      "cve": "CVE-2021-47435",
      "id": "CVE-2021-47435",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "390",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm: fix mempool NULL pointer race when completing IO",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47435.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T17:15:38Z",
      "cve": "CVE-2021-47435",
      "id": "CVE-2021-47435",
      "initial_release_date": "2024-05-25T03:34:21Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "130",
      "product_status:recommended": "633",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47435",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47435.json",
      "version": "61"
    },
    "vulnrichment": {
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\"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/md/dm.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed\"}, {\"url\": \"https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c\"}, {\"url\": \"https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87\"}, {\"url\": \"https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4\"}, {\"url\": \"https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61\"}, {\"url\": \"https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb\"}, {\"url\": \"https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndm: fix mempool NULL pointer race when completing IO\\n\\ndm_io_dec_pending() calls end_io_acct() first and will then dec md\\nin-flight pending count. But if a task is swapping DM table at same\\ntime this can result in a crash due to mempool-\u003eelements being NULL:\\n\\ntask1                             task2\\ndo_resume\\n -\u003edo_suspend\\n  -\u003edm_wait_for_completion\\n                                  bio_endio\\n\\t\\t\\t\\t   -\u003eclone_endio\\n\\t\\t\\t\\t    -\u003edm_io_dec_pending\\n\\t\\t\\t\\t     -\u003eend_io_acct\\n\\t\\t\\t\\t      -\u003ewakeup task1\\n -\u003edm_swap_table\\n  -\u003e__bind\\n   -\u003e__bind_mempools\\n    -\u003ebioset_exit\\n     -\u003emempool_exit\\n                                     -\u003efree_io\\n\\n[ 67.330330] Unable to handle kernel NULL pointer dereference at\\nvirtual address 0000000000000000\\n......\\n[ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO)\\n[ 67.330510] pc : mempool_free+0x70/0xa0\\n[ 67.330515] lr : mempool_free+0x4c/0xa0\\n[ 67.330520] sp : ffffff8008013b20\\n[ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004\\n[ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8\\n[ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800\\n[ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800\\n[ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80\\n[ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c\\n[ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd\\n[ 67.330563] x15: 000000000093b41e x14: 0000000000000010\\n[ 67.330569] x13: 0000000000007f7a x12: 0000000034155555\\n[ 67.330574] x11: 0000000000000001 x10: 0000000000000001\\n[ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000\\n[ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a\\n[ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001\\n[ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8\\n[ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970\\n[ 67.330609] Call trace:\\n[ 67.330616] mempool_free+0x70/0xa0\\n[ 67.330627] bio_put+0xf8/0x110\\n[ 67.330638] dec_pending+0x13c/0x230\\n[ 67.330644] clone_endio+0x90/0x180\\n[ 67.330649] bio_endio+0x198/0x1b8\\n[ 67.330655] dec_pending+0x190/0x230\\n[ 67.330660] clone_endio+0x90/0x180\\n[ 67.330665] bio_endio+0x198/0x1b8\\n[ 67.330673] blk_update_request+0x214/0x428\\n[ 67.330683] scsi_end_request+0x2c/0x300\\n[ 67.330688] scsi_io_completion+0xa0/0x710\\n[ 67.330695] scsi_finish_command+0xd8/0x110\\n[ 67.330700] scsi_softirq_done+0x114/0x148\\n[ 67.330708] blk_done_softirq+0x74/0xd0\\n[ 67.330716] __do_softirq+0x18c/0x374\\n[ 67.330724] irq_exit+0xb4/0xb8\\n[ 67.330732] __handle_domain_irq+0x84/0xc0\\n[ 67.330737] gic_handle_irq+0x148/0x1b0\\n[ 67.330744] el1_irq+0xe8/0x190\\n[ 67.330753] lpm_cpuidle_enter+0x4f8/0x538\\n[ 67.330759] cpuidle_enter_state+0x1fc/0x398\\n[ 67.330764] cpuidle_enter+0x18/0x20\\n[ 67.330772] do_idle+0x1b4/0x290\\n[ 67.330778] cpu_startup_entry+0x20/0x28\\n[ 67.330786] secondary_start_kernel+0x160/0x170\\n\\nFix this by:\\n1) Establishing pointers to \u0027struct dm_io\u0027 members in\\ndm_io_dec_pending() so that they may be passed into end_io_acct()\\n_after_ free_io() is called.\\n2) Moving end_io_acct() after free_io().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.313\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.278\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.242\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.193\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.113\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.14\", \"versionStartIncluding\": \"2.6.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"2.6.37\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T08:31:48.566Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47435\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-21T08:31:48.566Z\", \"dateReserved\": \"2024-05-21T14:58:30.830Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-22T06:19:31.562Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.