{"api_version":"1","generated_at":"2026-08-09T15:32:50+00:00","cve":"CVE-2021-47536","urls":{"html":"https://cve.report/CVE-2021-47536","api":"https://cve.report/api/cve/CVE-2021-47536.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-47536","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-47536"},"summary":{"title":"net/smc: fix wrong list_del in smc_lgr_cleanup_early","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix wrong list_del in smc_lgr_cleanup_early\n\nsmc_lgr_cleanup_early() meant to delete the link\ngroup from the link group list, but it deleted\nthe list head by mistake.\n\nThis may cause memory corruption since we didn't\nremove the real link group from the list and later\nmemseted the link group structure.\nWe got a list corruption panic when testing:\n\n[  231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000\n[  231.278222] ------------[ cut here ]------------\n[  231.278726] kernel BUG at lib/list_debug.c:53!\n[  231.279326] invalid opcode: 0000 [#1] SMP NOPTI\n[  231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435\n[  231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014\n[  231.281248] Workqueue: events smc_link_down_work\n[  231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90\n[  231.282258] Code: 4c 60 82 e8 7d cc 6a 00 0f 0b 48 89 fe 48 c7 c7 88 4c\n60 82 e8 6c cc 6a 00 0f 0b 48 89 fe 48 c7 c7 c0 4c 60 82 e8 5b cc 6a 00 <0f>\n0b 48 89 fe 48 c7 c7 00 4d 60 82 e8 4a cc 6a 00 0f 0b cc cc cc\n[  231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292\n[  231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000\n[  231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040\n[  231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001\n[  231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001\n[  231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003\n[  231.288337] FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\n[  231.289160] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0\n[  231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  231.291940] Call Trace:\n[  231.292211]  smc_lgr_terminate_sched+0x53/0xa0\n[  231.292677]  smc_switch_conns+0x75/0x6b0\n[  231.293085]  ? update_load_avg+0x1a6/0x590\n[  231.293517]  ? ttwu_do_wakeup+0x17/0x150\n[  231.293907]  ? update_load_avg+0x1a6/0x590\n[  231.294317]  ? newidle_balance+0xca/0x3d0\n[  231.294716]  smcr_link_down+0x50/0x1a0\n[  231.295090]  ? __wake_up_common_lock+0x77/0x90\n[  231.295534]  smc_link_down_work+0x46/0x60\n[  231.295933]  process_one_work+0x18b/0x350","state":"PUBLISHED","assigner":"Linux","published_at":"2024-05-24 15:15:17","updated_at":"2026-08-04 10:17:07"},"problem_types":["CWE-787"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/77731fede297a23d26f2d169b4269466b2c82529","name":"https://git.kernel.org/stable/c/77731fede297a23d26f2d169b4269466b2c82529","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0ba","name":"https://git.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0ba","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66c","name":"https://git.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66c","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-47536","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47536","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a0a62ee15a829ebf8aeec55a4f1688230439b3e0 77731fede297a23d26f2d169b4269466b2c82529 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a0a62ee15a829ebf8aeec55a4f1688230439b3e0 95518fe354d712dca6f431cf2a11b8f63bc9a66c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a0a62ee15a829ebf8aeec55a4f1688230439b3e0 789b6cc2a5f9123b9c549b886fdc47c865cfe0ba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.84 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.7 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.16 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"47536","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2021-47536","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2024-05-28T15:18:35.309729Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2024-06-04T17:14:10.859Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"},{"providerMetadata":{"dateUpdated":"2024-08-04T05:39:59.717Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"tags":["x_transferred"],"url":"https://git.kernel.org/stable/c/77731fede297a23d26f2d169b4269466b2c82529"},{"tags":["x_transferred"],"url":"https://git.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66c"},{"tags":["x_transferred"],"url":"https://git.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0ba"}],"title":"CVE Program Container"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/smc/smc_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"77731fede297a23d26f2d169b4269466b2c82529","status":"affected","version":"a0a62ee15a829ebf8aeec55a4f1688230439b3e0","versionType":"git"},{"lessThan":"95518fe354d712dca6f431cf2a11b8f63bc9a66c","status":"affected","version":"a0a62ee15a829ebf8aeec55a4f1688230439b3e0","versionType":"git"},{"lessThan":"789b6cc2a5f9123b9c549b886fdc47c865cfe0ba","status":"affected","version":"a0a62ee15a829ebf8aeec55a4f1688230439b3e0","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/smc/smc_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.5"},{"lessThan":"5.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.84","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"5.16","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.84","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.7","versionStartIncluding":"5.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.16","versionStartIncluding":"5.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix wrong list_del in smc_lgr_cleanup_early\n\nsmc_lgr_cleanup_early() meant to delete the link\ngroup from the link group list, but it deleted\nthe list head by mistake.\n\nThis may cause memory corruption since we didn't\nremove the real link group from the list and later\nmemseted the link group structure.\nWe got a list corruption panic when testing:\n\n[  231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000\n[  231.278222] ------------[ cut here ]------------\n[  231.278726] kernel BUG at lib/list_debug.c:53!\n[  231.279326] invalid opcode: 0000 [#1] SMP NOPTI\n[  231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435\n[  231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014\n[  231.281248] Workqueue: events smc_link_down_work\n[  231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90\n[  231.282258] Code: 4c 60 82 e8 7d cc 6a 00 0f 0b 48 89 fe 48 c7 c7 88 4c\n60 82 e8 6c cc 6a 00 0f 0b 48 89 fe 48 c7 c7 c0 4c 60 82 e8 5b cc 6a 00 <0f>\n0b 48 89 fe 48 c7 c7 00 4d 60 82 e8 4a cc 6a 00 0f 0b cc cc cc\n[  231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292\n[  231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000\n[  231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040\n[  231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001\n[  231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001\n[  231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003\n[  231.288337] FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\n[  231.289160] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0\n[  231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  231.291940] Call Trace:\n[  231.292211]  smc_lgr_terminate_sched+0x53/0xa0\n[  231.292677]  smc_switch_conns+0x75/0x6b0\n[  231.293085]  ? update_load_avg+0x1a6/0x590\n[  231.293517]  ? ttwu_do_wakeup+0x17/0x150\n[  231.293907]  ? update_load_avg+0x1a6/0x590\n[  231.294317]  ? newidle_balance+0xca/0x3d0\n[  231.294716]  smcr_link_down+0x50/0x1a0\n[  231.295090]  ? __wake_up_common_lock+0x77/0x90\n[  231.295534]  smc_link_down_work+0x46/0x60\n[  231.295933]  process_one_work+0x18b/0x350"}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:01:12.407Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/77731fede297a23d26f2d169b4269466b2c82529"},{"url":"https://git.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66c"},{"url":"https://git.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0ba"}],"title":"net/smc: fix wrong list_del in smc_lgr_cleanup_early","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2021-47536","datePublished":"2024-05-24T15:09:44.651Z","dateReserved":"2024-05-24T15:02:54.827Z","dateUpdated":"2026-08-04T09:01:12.407Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-05-24 15:15:17","lastModifiedDate":"2026-08-04 10:17:07","problem_types":["CWE-787"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2024-05-28T15:18:35.309729Z","id":"CVE-2021-47536","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.84","matchCriteriaId":"AE5B4333-2C46-40C3-8B42-0168AD91DDE1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.7","matchCriteriaId":"A696A60B-2782-4119-83DD-1EFFBC903F02"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*","matchCriteriaId":"357AA433-37E8-4323-BFB2-3038D6E4B414"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*","matchCriteriaId":"A73429BA-C2D9-4D0C-A75F-06A1CA8B3983"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*","matchCriteriaId":"F621B5E3-E99D-49E7-90B9-EC3B77C95383"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"47536","Ordinal":"1","Title":"net/smc: fix wrong list_del in smc_lgr_cleanup_early","CVE":"CVE-2021-47536","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"47536","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix wrong list_del in smc_lgr_cleanup_early\n\nsmc_lgr_cleanup_early() meant to delete the link\ngroup from the link group list, but it deleted\nthe list head by mistake.\n\nThis may cause memory corruption since we didn't\nremove the real link group from the list and later\nmemseted the link group structure.\nWe got a list corruption panic when testing:\n\n[  231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000\n[  231.278222] ------------[ cut here ]------------\n[  231.278726] kernel BUG at lib/list_debug.c:53!\n[  231.279326] invalid opcode: 0000 [#1] SMP NOPTI\n[  231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435\n[  231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014\n[  231.281248] Workqueue: events smc_link_down_work\n[  231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90\n[  231.282258] Code: 4c 60 82 e8 7d cc 6a 00 0f 0b 48 89 fe 48 c7 c7 88 4c\n60 82 e8 6c cc 6a 00 0f 0b 48 89 fe 48 c7 c7 c0 4c 60 82 e8 5b cc 6a 00 <0f>\n0b 48 89 fe 48 c7 c7 00 4d 60 82 e8 4a cc 6a 00 0f 0b cc cc cc\n[  231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292\n[  231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000\n[  231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040\n[  231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001\n[  231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001\n[  231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003\n[  231.288337] FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\n[  231.289160] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0\n[  231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  231.291940] Call Trace:\n[  231.292211]  smc_lgr_terminate_sched+0x53/0xa0\n[  231.292677]  smc_switch_conns+0x75/0x6b0\n[  231.293085]  ? update_load_avg+0x1a6/0x590\n[  231.293517]  ? ttwu_do_wakeup+0x17/0x150\n[  231.293907]  ? update_load_avg+0x1a6/0x590\n[  231.294317]  ? newidle_balance+0xca/0x3d0\n[  231.294716]  smcr_link_down+0x50/0x1a0\n[  231.295090]  ? __wake_up_common_lock+0x77/0x90\n[  231.295534]  smc_link_down_work+0x46/0x60\n[  231.295933]  process_one_work+0x18b/0x350","Type":"Description","Title":"net/smc: fix wrong list_del in smc_lgr_cleanup_early"}]}}}