{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-47435", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.830Z", "datePublished": "2024-05-22T06:19:31.562Z", "dateUpdated": "2024-11-04T12:05:51.756Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T12:05:51.756Z"}, "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->elements being NULL:\n\ntask1 task2\ndo_resume\n ->do_suspend\n ->dm_wait_for_completion\n bio_endio\n\t\t\t\t ->clone_endio\n\t\t\t\t ->dm_io_dec_pending\n\t\t\t\t ->end_io_acct\n\t\t\t\t ->wakeup task1\n ->dm_swap_table\n ->__bind\n ->__bind_mempools\n ->bioset_exit\n ->mempool_exit\n ->free_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 'struct dm_io' 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()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm.c"], "versions": [{"version": "1da177e4c3f4", "lessThan": "9fb7cd5c7fef", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "d35aef9c60d3", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "9e07272cca2e", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "ad1393b92e50", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "d29c78d3f9c5", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "6e506f07c5b5", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "d208b89401e0", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm.c"], "versions": [{"version": "4.9.313", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.278", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.242", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.193", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.113", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.14", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "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"}], "title": "dm: fix mempool NULL pointer race when completing IO", "x_generator": {"engine": "bippy-9e1c9544281a"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47435", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-22T18:48:43.435062Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:25.705Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.225Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d35aef9c60d310eff3eaddacce301efe877e2b7c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9e07272cca2ed76f7f6073f4444b1143828c8d87", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/ad1393b92e5059218d055bfec8f4946d85ad04c4", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d29c78d3f9c5d2604548c1065bf1ec212728ea61", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/6e506f07c5b561d673dd0b0d8f7f420cc48024fb", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/d208b89401e073de986dc891037c5a668f5d5d95", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.225Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47435", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-22T18:48:43.435062Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-22T18:48:58.118Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "dm: fix mempool NULL pointer race when completing IO", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f4", "lessThan": "9fb7cd5c7fef", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "d35aef9c60d3", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "9e07272cca2e", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "ad1393b92e50", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "d29c78d3f9c5", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "6e506f07c5b5", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f4", "lessThan": "d208b89401e0", "versionType": "git"}], "programFiles": ["drivers/md/dm.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "unaffected", "version": "4.9.313", "versionType": "semver", "lessThanOrEqual": "4.9.*"}, {"status": "unaffected", "version": "4.14.278", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.242", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.193", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.113", "versionType": "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-9e1c9544281a"}, "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->elements being NULL:\n\ntask1 task2\ndo_resume\n ->do_suspend\n ->dm_wait_for_completion\n bio_endio\n\t\t\t\t ->clone_endio\n\t\t\t\t ->dm_io_dec_pending\n\t\t\t\t ->end_io_acct\n\t\t\t\t ->wakeup task1\n ->dm_swap_table\n ->__bind\n ->__bind_mempools\n ->bioset_exit\n ->mempool_exit\n ->free_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 'struct dm_io' 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()."}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T12:05:51.756Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47435", "state": "PUBLISHED", "dateUpdated": "2024-11-04T12:05:51.756Z", "dateReserved": "2024-05-21T14:58:30.830Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-22T06:19:31.562Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"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->elements being NULL:\n\ntask1 task2\ndo_resume\n ->do_suspend\n ->dm_wait_for_completion\n bio_endio\n\t\t\t\t ->clone_endio\n\t\t\t\t ->dm_io_dec_pending\n\t\t\t\t ->end_io_acct\n\t\t\t\t ->wakeup task1\n ->dm_swap_table\n ->__bind\n ->__bind_mempools\n ->bioset_exit\n ->mempool_exit\n ->free_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 'struct dm_io' 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->elementos son NULL: tarea1 tarea2 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] 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 'struct dm_io' 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": "2024-05-22T12:46:53.887", "metrics": {}, "published": "2024-05-22T07:15:08.790", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"affected_release": [{"advisory": "RHSA-2022:1975", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-372.9.1.rt7.166.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2022:1988", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-372.9.1.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-05-10T00:00:00Z"}, {"advisory": "RHSA-2022:5220", "cpe": "cpe:/o:redhat:rhel_eus:8.2", "package": "kernel-0:4.18.0-193.87.1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-06-28T00:00:00Z"}, {"advisory": "RHSA-2022:5626", "cpe": "cpe:/o:redhat:rhel_eus:8.4", "package": "kernel-0:4.18.0-305.57.1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-07-19T00:00:00Z"}], "bugzilla": {"description": "kernel: dm: fix mempool NULL pointer race when completing IO", "id": "2282879", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282879"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndm: fix mempool NULL pointer race when completing IO\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->elements being NULL:\ntask1 task2\ndo_resume\n->do_suspend\n->dm_wait_for_completion\nbio_endio\n->clone_endio\n->dm_io_dec_pending\n->end_io_acct\n->wakeup task1\n->dm_swap_table\n->__bind\n->__bind_mempools\n->bioset_exit\n->mempool_exit\n->free_io\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\nFix this by:\n1) Establishing pointers to 'struct dm_io' 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()."], "name": "CVE-2021-47435", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47435\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47435"], "threat_severity": "Moderate", "upstream_fix": "kernel 4.9.313, kernel 4.14.278, kernel 4.19.242, kernel 5.4.193, kernel 5.10.113, kernel 5.14.14, kernel 5.15"}