CVE-2021-47536

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47536", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-24T15:02:54.827Z", "datePublished": "2024-05-24T15:09:44.651Z", "dateUpdated": "2026-08-05T08:48:17.750Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:17.750Z"}, "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[ \u00a0231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000\n[ \u00a0231.278222] ------------[ cut here ]------------\n[ \u00a0231.278726] kernel BUG at lib/list_debug.c:53!\n[ \u00a0231.279326] invalid opcode: 0000 [#1] SMP NOPTI\n[ \u00a0231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435\n[ \u00a0231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014\n[ \u00a0231.281248] Workqueue: events smc_link_down_work\n[ \u00a0231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90\n[ \u00a0231.282258] 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[ \u00a0231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292\n[ \u00a0231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000\n[ \u00a0231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040\n[ \u00a0231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001\n[ \u00a0231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001\n[ \u00a0231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003\n[ \u00a0231.288337] FS: \u00a00000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\n[ \u00a0231.289160] CS: \u00a00010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ \u00a0231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0\n[ \u00a0231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ \u00a0231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ \u00a0231.291940] Call Trace:\n[ \u00a0231.292211] \u00a0smc_lgr_terminate_sched+0x53/0xa0\n[ \u00a0231.292677] \u00a0smc_switch_conns+0x75/0x6b0\n[ \u00a0231.293085] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.293517] \u00a0? ttwu_do_wakeup+0x17/0x150\n[ \u00a0231.293907] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.294317] \u00a0? newidle_balance+0xca/0x3d0\n[ \u00a0231.294716] \u00a0smcr_link_down+0x50/0x1a0\n[ \u00a0231.295090] \u00a0? __wake_up_common_lock+0x77/0x90\n[ \u00a0231.295534] \u00a0smc_link_down_work+0x46/0x60\n[ \u00a0231.295933] \u00a0process_one_work+0x18b/0x350"}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:N - smc_lgr_cleanup_early() is reached from smc_listen_decline()/smc_conn_abort() after a remote peer's CLC handshake causes the server to create a first-contact link group and then fail (bad/missing Confirm, disconnect, RDMA finish error). The CLC exchange is ordinary TCP payload to an SMC listener, so a remote peer can trigger it without local access.\nAC:L - The attacker fully controls the handshake: send a valid Proposal so the server creates the lgr and Accepts, then abort Confirm or tear down the TCP session to force cleanup_early. No race or attacker-uncontrollable memory layout is required; RDMA/ISM presence is the victim's normal SMC deployment, not an AC:H condition.\nPR:N - The CLC handshake runs immediately after TCP connect and before any application authentication; socket(AF_SMC)/smc_create() also has no capability check. An unauthenticated remote peer that can reach the SMC listener is sufficient.\nUI:N - smc_listen_work() processes the handshake automatically; the attacker only needs to connect and drive the CLC sequence against an already-listening SMC socket.\nS:U - The corruption is confined to kernel heap/list state in the SMC subsystem on the host; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Wrong list_del_init() on the list head leaves other link groups linked through a freed/memset'd smc_link_group, yielding a classic heap UAF that can expose and be groomed for arbitrary kernel reads.\nI:H - The commit documents memory corruption from failing to unlink the real lgr then zeroing/freeing it while list neighbors still point at it; subsequent list_del/terminate paths write through corrupted list pointers, enabling heap corruption and control-flow hijack.\nA:H - The reported failure is an immediate kernel BUG at lib/list_debug.c (list corruption with NULL prev->next) in smc_link_down_work/smc_lgr_terminate_sched, i.e. a reliable kernel panic the attacker can retrigger."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc_core.c"], "versions": [{"version": "a0a62ee15a829ebf8aeec55a4f1688230439b3e0", "lessThan": "77731fede297a23d26f2d169b4269466b2c82529", "status": "affected", "versionType": "git"}, {"version": "a0a62ee15a829ebf8aeec55a4f1688230439b3e0", "lessThan": "95518fe354d712dca6f431cf2a11b8f63bc9a66c", "status": "affected", "versionType": "git"}, {"version": "a0a62ee15a829ebf8aeec55a4f1688230439b3e0", "lessThan": "789b6cc2a5f9123b9c549b886fdc47c865cfe0ba", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc_core.c"], "versions": [{"version": "5.5", "status": "affected"}, {"version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.84", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.7", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.16", "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": "5.5", "versionEndExcluding": "5.10.84"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.16"}]}]}], "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"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47536", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-28T15:18:35.309729Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:14:10.859Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.717Z"}, "title": "CVE Program Container", "references": [{"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", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"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", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.717Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47536", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-28T15:18:35.309729Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-28T15:18:44.425Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "net/smc: fix wrong list_del in smc_lgr_cleanup_early", "metrics": [{"cvssV3_1": {"version": "3.1", "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"}, "scenarios": [{"lang": "en", "value": "AV:N - smc_lgr_cleanup_early() is reached from smc_listen_decline()/smc_conn_abort() after a remote peer's CLC handshake causes the server to create a first-contact link group and then fail (bad/missing Confirm, disconnect, RDMA finish error). The CLC exchange is ordinary TCP payload to an SMC listener, so a remote peer can trigger it without local access.\nAC:L - The attacker fully controls the handshake: send a valid Proposal so the server creates the lgr and Accepts, then abort Confirm or tear down the TCP session to force cleanup_early. No race or attacker-uncontrollable memory layout is required; RDMA/ISM presence is the victim's normal SMC deployment, not an AC:H condition.\nPR:N - The CLC handshake runs immediately after TCP connect and before any application authentication; socket(AF_SMC)/smc_create() also has no capability check. An unauthenticated remote peer that can reach the SMC listener is sufficient.\nUI:N - smc_listen_work() processes the handshake automatically; the attacker only needs to connect and drive the CLC sequence against an already-listening SMC socket.\nS:U - The corruption is confined to kernel heap/list state in the SMC subsystem on the host; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Wrong list_del_init() on the list head leaves other link groups linked through a freed/memset'd smc_link_group, yielding a classic heap UAF that can expose and be groomed for arbitrary kernel reads.\nI:H - The commit documents memory corruption from failing to unlink the real lgr then zeroing/freeing it while list neighbors still point at it; subsequent list_del/terminate paths write through corrupted list pointers, enabling heap corruption and control-flow hijack.\nA:H - The reported failure is an immediate kernel BUG at lib/list_debug.c (list corruption with NULL prev->next) in smc_link_down_work/smc_lgr_terminate_sched, i.e. a reliable kernel panic the attacker can retrigger."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a0a62ee15a829ebf8aeec55a4f1688230439b3e0", "lessThan": "77731fede297a23d26f2d169b4269466b2c82529", "versionType": "git"}, {"status": "affected", "version": "a0a62ee15a829ebf8aeec55a4f1688230439b3e0", "lessThan": "95518fe354d712dca6f431cf2a11b8f63bc9a66c", "versionType": "git"}, {"status": "affected", "version": "a0a62ee15a829ebf8aeec55a4f1688230439b3e0", "lessThan": "789b6cc2a5f9123b9c549b886fdc47c865cfe0ba", "versionType": "git"}], "programFiles": ["net/smc/smc_core.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.5"}, {"status": "unaffected", "version": "0", "lessThan": "5.5", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.84", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.7", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/smc/smc_core.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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[ \u00a0231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000\n[ \u00a0231.278222] ------------[ cut here ]------------\n[ \u00a0231.278726] kernel BUG at lib/list_debug.c:53!\n[ \u00a0231.279326] invalid opcode: 0000 [#1] SMP NOPTI\n[ \u00a0231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435\n[ \u00a0231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014\n[ \u00a0231.281248] Workqueue: events smc_link_down_work\n[ \u00a0231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90\n[ \u00a0231.282258] 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[ \u00a0231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292\n[ \u00a0231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000\n[ \u00a0231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040\n[ \u00a0231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001\n[ \u00a0231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001\n[ \u00a0231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003\n[ \u00a0231.288337] FS: \u00a00000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\n[ \u00a0231.289160] CS: \u00a00010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ \u00a0231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0\n[ \u00a0231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ \u00a0231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ \u00a0231.291940] Call Trace:\n[ \u00a0231.292211] \u00a0smc_lgr_terminate_sched+0x53/0xa0\n[ \u00a0231.292677] \u00a0smc_switch_conns+0x75/0x6b0\n[ \u00a0231.293085] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.293517] \u00a0? ttwu_do_wakeup+0x17/0x150\n[ \u00a0231.293907] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.294317] \u00a0? newidle_balance+0xca/0x3d0\n[ \u00a0231.294716] \u00a0smcr_link_down+0x50/0x1a0\n[ \u00a0231.295090] \u00a0? __wake_up_common_lock+0x77/0x90\n[ \u00a0231.295534] \u00a0smc_link_down_work+0x46/0x60\n[ \u00a0231.295933] \u00a0process_one_work+0x18b/0x350"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.84", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.7", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16", "versionStartIncluding": "5.5"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:17.750Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47536", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:48:17.750Z", "dateReserved": "2024-05-24T15:02:54.827Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-24T15:09:44.651Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AE5B4333-2C46-40C3-8B42-0168AD91DDE1", "versionEndExcluding": "5.10.84", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A696A60B-2782-4119-83DD-1EFFBC903F02", "versionEndExcluding": "5.15.7", "versionStartIncluding": "5.11", "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", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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[ \u00a0231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000\n[ \u00a0231.278222] ------------[ cut here ]------------\n[ \u00a0231.278726] kernel BUG at lib/list_debug.c:53!\n[ \u00a0231.279326] invalid opcode: 0000 [#1] SMP NOPTI\n[ \u00a0231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435\n[ \u00a0231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014\n[ \u00a0231.281248] Workqueue: events smc_link_down_work\n[ \u00a0231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90\n[ \u00a0231.282258] 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[ \u00a0231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292\n[ \u00a0231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000\n[ \u00a0231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040\n[ \u00a0231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001\n[ \u00a0231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001\n[ \u00a0231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003\n[ \u00a0231.288337] FS: \u00a00000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\n[ \u00a0231.289160] CS: \u00a00010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ \u00a0231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0\n[ \u00a0231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ \u00a0231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ \u00a0231.291940] Call Trace:\n[ \u00a0231.292211] \u00a0smc_lgr_terminate_sched+0x53/0xa0\n[ \u00a0231.292677] \u00a0smc_switch_conns+0x75/0x6b0\n[ \u00a0231.293085] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.293517] \u00a0? ttwu_do_wakeup+0x17/0x150\n[ \u00a0231.293907] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.294317] \u00a0? newidle_balance+0xca/0x3d0\n[ \u00a0231.294716] \u00a0smcr_link_down+0x50/0x1a0\n[ \u00a0231.295090] \u00a0? __wake_up_common_lock+0x77/0x90\n[ \u00a0231.295534] \u00a0smc_link_down_work+0x46/0x60\n[ \u00a0231.295933] \u00a0process_one_work+0x18b/0x350"}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/smc: corrige list_del incorrecto en smc_lgr_cleanup_early smc_lgr_cleanup_early() pretend\u00eda eliminar el grupo de enlaces de la lista de grupos de enlaces, pero elimin\u00f3 el encabezado de la lista por error. Esto puede causar da\u00f1os en la memoria ya que no eliminamos el grupo de enlaces real de la lista y luego integramos la estructura del grupo de enlaces. Recibimos un p\u00e1nico de corrupci\u00f3n de lista al realizar la prueba: [ 231.277259] list_del corruption. prev-&gt;next should be ffff8881398a8000, but was 0000000000000000 [ 231.278222] ------------[ cut here ]------------ [ 231.278726] kernel BUG at lib/list_debug.c:53! [ 231.279326] invalid opcode: 0000 [#1] SMP NOPTI [ 231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435 [ 231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014 [ 231.281248] Workqueue: events smc_link_down_work [ 231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90 [ 231.282258] Code: 4c 60 82 e8 7d cc 6a 00 0f 0b 48 89 fe 48 c7 c7 88 4c 60 82 e8 6c cc 6a 00 0f 0b 48 89 fe 48 c7 c7 c0 4c 60 82 e8 5b cc 6a 00 &lt;0f&gt; 0b 48 89 fe 48 c7 c7 00 4d 60 82 e8 4a cc 6a 00 0f 0b cc cc cc [ 231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292 [ 231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000 [ 231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040 [ 231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001 [ 231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001 [ 231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003 [ 231.288337] FS: 0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 [ 231.289160] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0 [ 231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 231.291940] Call Trace: [ 231.292211] smc_lgr_terminate_sched+0x53/0xa0 [ 231.292677] smc_switch_conns+0x75/0x6b0 [ 231.293085] ? update_load_avg+0x1a6/0x590 [ 231.293517] ? ttwu_do_wakeup+0x17/0x150 [ 231.293907] ? update_load_avg+0x1a6/0x590 [ 231.294317] ? newidle_balance+0xca/0x3d0 [ 231.294716] smcr_link_down+0x50/0x1a0 [ 231.295090] ? __wake_up_common_lock+0x77/0x90 [ 231.295534] smc_link_down_work+0x46/0x60 [ 231.295933] process_one_work+0x18b/0x350 "}], "id": "CVE-2021-47536", "lastModified": "2026-08-04T10:17:07.790", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47536", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-28T15:18:35.309729Z", "version": "2.0.3"}}]}, "published": "2024-05-24T15:15:17.317", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77731fede297a23d26f2d169b4269466b2c82529"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0ba"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77731fede297a23d26f2d169b4269466b2c82529"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0ba"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/smc: fix wrong list_del in smc_lgr_cleanup_early", "id": "2283415", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2283415"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-119", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/smc: fix wrong list_del in smc_lgr_cleanup_early\nsmc_lgr_cleanup_early() meant to delete the link\ngroup from the link group list, but it deleted\nthe list head by mistake.\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[ \u00a0231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000\n[ \u00a0231.278222] ------------[ cut here ]------------\n[ \u00a0231.278726] kernel BUG at lib/list_debug.c:53!\n[ \u00a0231.279326] invalid opcode: 0000 [#1] SMP NOPTI\n[ \u00a0231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435\n[ \u00a0231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014\n[ \u00a0231.281248] Workqueue: events smc_link_down_work\n[ \u00a0231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90\n[ \u00a0231.282258] 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[ \u00a0231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292\n[ \u00a0231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000\n[ \u00a0231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040\n[ \u00a0231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001\n[ \u00a0231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001\n[ \u00a0231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003\n[ \u00a0231.288337] FS: \u00a00000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000\n[ \u00a0231.289160] CS: \u00a00010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ \u00a0231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0\n[ \u00a0231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ \u00a0231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ \u00a0231.291940] Call Trace:\n[ \u00a0231.292211] \u00a0smc_lgr_terminate_sched+0x53/0xa0\n[ \u00a0231.292677] \u00a0smc_switch_conns+0x75/0x6b0\n[ \u00a0231.293085] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.293517] \u00a0? ttwu_do_wakeup+0x17/0x150\n[ \u00a0231.293907] \u00a0? update_load_avg+0x1a6/0x590\n[ \u00a0231.294317] \u00a0? newidle_balance+0xca/0x3d0\n[ \u00a0231.294716] \u00a0smcr_link_down+0x50/0x1a0\n[ \u00a0231.295090] \u00a0? __wake_up_common_lock+0x77/0x90\n[ \u00a0231.295534] \u00a0smc_link_down_work+0x46/0x60\n[ \u00a0231.295933] \u00a0process_one_work+0x18b/0x350"], "name": "CVE-2021-47536", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47536\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47536\nhttps://lore.kernel.org/linux-cve-announce/2024052437-CVE-2021-47536-fa00@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T22:15:44.115588+00:00", "updated": "2025-07-12T22:15:44.115644+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}