{"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":"2025-05-21T08:31:48.566Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-21T08:31:48.566Z"},"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":"6a8736d10cb413be95ea443ba40f25c93f4ef9b2","lessThan":"9fb7cd5c7fef0f1c982e3cd27745a0dec260eaed","status":"affected","versionType":"git"},{"version":"6a8736d10cb413be95ea443ba40f25c93f4ef9b2","lessThan":"d35aef9c60d310eff3eaddacce301efe877e2b7c","status":"affected","versionType":"git"},{"version":"6a8736d10cb413be95ea443ba40f25c93f4ef9b2","lessThan":"9e07272cca2ed76f7f6073f4444b1143828c8d87","status":"affected","versionType":"git"},{"version":"6a8736d10cb413be95ea443ba40f25c93f4ef9b2","lessThan":"ad1393b92e5059218d055bfec8f4946d85ad04c4","status":"affected","versionType":"git"},{"version":"6a8736d10cb413be95ea443ba40f25c93f4ef9b2","lessThan":"d29c78d3f9c5d2604548c1065bf1ec212728ea61","status":"affected","versionType":"git"},{"version":"6a8736d10cb413be95ea443ba40f25c93f4ef9b2","lessThan":"6e506f07c5b561d673dd0b0d8f7f420cc48024fb","status":"affected","versionType":"git"},{"version":"6a8736d10cb413be95ea443ba40f25c93f4ef9b2","lessThan":"d208b89401e073de986dc891037c5a668f5d5d95","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":"2.6.37","status":"affected"},{"version":"0","lessThan":"2.6.37","status":"unaffected","versionType":"semver"},{"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"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.37","versionEndExcluding":"4.9.313"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.37","versionEndExcluding":"4.14.278"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.37","versionEndExcluding":"4.19.242"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.37","versionEndExcluding":"5.4.193"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.37","versionEndExcluding":"5.10.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.37","versionEndExcluding":"5.14.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.37","versionEndExcluding":"5.15"}]}]}],"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-1.2.0"}},"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 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