CVE-2021-47199

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adds that same set\nof mod hdr actions to reset ct_state until the max of mod hdr\nactions is reached.\n\nAlso the driver never releases the allocated mod hdr actions and\ncausing a memleak.\n\nFix above two issues by moving CT clear mod acts allocation\ninto the parsing actions phase and only use it when offloading the rule.\nThe release of mod acts will be done in the normal flow_put().\n\n backtrace:\n [<000000007316e2f3>] krealloc+0x83/0xd0\n [<00000000ef157de1>] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core]\n [<00000000970ce4ae>] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core]\n [<0000000067c5fa17>] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core]\n [<00000000d032eb98>] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core]\n [<00000000fd23b869>] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core]\n [<000000004fc24acc>] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core]\n [<00000000dc741c17>] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core]\n [<00000000e92e49d7>] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core]\n [<00000000f60f5602>] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c", "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h", "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"], "versions": [{"version": "1ef3018f5af3da6376fae546e4dfc3f05f063815", "lessThan": "486e8de6e233ff2999493533c6259d1cb538653b", "status": "affected", "versionType": "git"}, {"version": "1ef3018f5af3da6376fae546e4dfc3f05f063815", "lessThan": "806401c20a0f9c51b6c8fd7035671e6ca841f6c2", "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/net/ethernet/mellanox/mlx5/core/en/tc_ct.c", "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h", "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.5", "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": "5.7", "versionEndExcluding": "5.15.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b"}, {"url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"}], "title": "net/mlx5e: CT, Fix multiple allocations and memleak of mod acts", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.447Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47199", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:50:01.719714Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:37.887Z"}}]}}

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then reoffload it.\n\nEach time this happens, the ct clear handling adds that same set\nof mod hdr actions to reset ct_state until the max of mod hdr\nactions is reached.\n\nAlso the driver never releases the allocated mod hdr actions and\ncausing a memleak.\n\nFix above two issues by moving CT clear mod acts allocation\ninto the parsing actions phase and only use it when offloading the rule.\nThe release of mod acts will be done in the normal flow_put().\n\n backtrace:\n [<000000007316e2f3>] krealloc+0x83/0xd0\n [<00000000ef157de1>] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core]\n [<00000000970ce4ae>] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core]\n [<0000000067c5fa17>] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core]\n [<00000000d032eb98>] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core]\n [<00000000fd23b869>] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core]\n [<000000004fc24acc>] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core]\n [<00000000dc741c17>] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core]\n [<00000000e92e49d7>] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core]\n [<00000000f60f5602>] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.5", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.16", "versionStartIncluding": "5.7"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:06:14.321Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47199", "state": "PUBLISHED", "dateUpdated": "2025-05-04T07:06:14.321Z", "dateReserved": "2024-03-25T09:12:14.117Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-04-10T18:56:34.529Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c", "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h", "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "486e8de6e233ff2999493533c6259d1cb538653b", "status": "affected", "version": "1ef3018f5af3da6376fae546e4dfc3f05f063815", "versionType": "git"}, {"lessThan": "806401c20a0f9c51b6c8fd7035671e6ca841f6c2", "status": "affected", "version": "1ef3018f5af3da6376fae546e4dfc3f05f063815", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c", "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h", "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.5", "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": "C7729BC6-58CD-4977-A1C7-49E67D2FA006", "versionEndExcluding": "5.15.5", "versionStartIncluding": "5.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*", "matchCriteriaId": "357AA433-37E8-4323-BFB2-3038D6E4B414", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: CT, Fix multiple allocations and memleak of mod acts\n\nCT clear action offload adds additional mod hdr actions to the\nflow's original mod actions in order to clear the registers which\nhold ct_state.\nWhen such flow also includes encap action, a neigh update event\ncan cause the driver to unoffload the flow and then reoffload it.\n\nEach time this happens, the ct clear handling adds that same set\nof mod hdr actions to reset ct_state until the max of mod hdr\nactions is reached.\n\nAlso the driver never releases the allocated mod hdr actions and\ncausing a memleak.\n\nFix above two issues by moving CT clear mod acts allocation\ninto the parsing actions phase and only use it when offloading the rule.\nThe release of mod acts will be done in the normal flow_put().\n\n backtrace:\n [<000000007316e2f3>] krealloc+0x83/0xd0\n [<00000000ef157de1>] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core]\n [<00000000970ce4ae>] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core]\n [<0000000067c5fa17>] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core]\n [<00000000d032eb98>] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core]\n [<00000000fd23b869>] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core]\n [<000000004fc24acc>] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core]\n [<00000000dc741c17>] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core]\n [<00000000e92e49d7>] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core]\n [<00000000f60f5602>] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/mlx5e: CT, corrige asignaciones m\u00faltiples y fuga de memoria de actos mod La descarga de la acci\u00f3n CT clear agrega acciones mod hdr adicionales a las acciones mod originales del flujo para borrar los registros que contienen ct_state. Cuando dicho flujo tambi\u00e9n incluye la acci\u00f3n encap, un evento de actualizaci\u00f3n vecinal puede hacer que el controlador descargue el flujo y luego lo vuelva a descargar. Cada vez que esto sucede, el manejo de ct clear agrega ese mismo conjunto de acciones mod hdr para restablecer ct_state hasta que se alcanza el m\u00e1ximo de acciones mod hdr. Adem\u00e1s, el controlador nunca libera las acciones mod hdr asignadas y causa una fuga de memoria. Corrija los dos problemas anteriores moviendo la asignaci\u00f3n de actos mod de CT clear a la fase de acciones de an\u00e1lisis y solo \u00faselo al descargar la regla. La liberaci\u00f3n de actos mod se realizar\u00e1 en el flow_put() normal. seguimiento inverso: [&lt;000000007316e2f3&gt;] krealloc+0x83/0xd0 [&lt;00000000ef157de1&gt;] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core] [&lt;00000000970ce4ae&gt;] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core] [&lt;0000000067c5fa17&gt;] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core] [&lt;00000000d032eb98&gt;] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core] [&lt;00000000fd23b869&gt;] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core] [&lt;000000004fc24acc&gt;] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core] [&lt;00000000dc741c17&gt;] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core] [&lt;00000000e92e49d7&gt;] mlx5e_rep_actualizaci\u00f3n_flujos+0x6e4/0x9b0 [mlx5_core] [&lt;00000000f60f5602&gt;] mlx5e_rep_neigh_actualizaci\u00f3n+0x39a/0x5d0 [mlx5_core]"}], "id": "CVE-2021-47199", "lastModified": "2026-06-17T04:16:53.560", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47199", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:50:01.719714Z", "version": "2.0.3"}}]}, "published": "2024-04-10T19:15:48.037", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/mlx5e: CT, Fix multiple allocations and memleak of mod acts", "id": "2274610", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2274610"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/mlx5e: CT, Fix multiple allocations and memleak of mod acts\nCT clear action offload adds additional mod hdr actions to the\nflow's original mod actions in order to clear the registers which\nhold ct_state.\nWhen such flow also includes encap action, a neigh update event\ncan cause the driver to unoffload the flow and then reoffload it.\nEach time this happens, the ct clear handling adds that same set\nof mod hdr actions to reset ct_state until the max of mod hdr\nactions is reached.\nAlso the driver never releases the allocated mod hdr actions and\ncausing a memleak.\nFix above two issues by moving CT clear mod acts allocation\ninto the parsing actions phase and only use it when offloading the rule.\nThe release of mod acts will be done in the normal flow_put().\nbacktrace:\n[<000000007316e2f3>] krealloc+0x83/0xd0\n[<00000000ef157de1>] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core]\n[<00000000970ce4ae>] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core]\n[<0000000067c5fa17>] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core]\n[<00000000d032eb98>] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core]\n[<00000000fd23b869>] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core]\n[<000000004fc24acc>] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core]\n[<00000000dc741c17>] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core]\n[<00000000e92e49d7>] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core]\n[<00000000f60f5602>] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]"], "name": "CVE-2021-47199", "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": "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: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": "2024-04-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47199\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47199\nhttps://lore.kernel.org/linux-cve-announce/2024041036-CVE-2021-47199-604a@gregkh/T"], "threat_severity": "Low"}

{}