CVE-2021-46913 (GCVE-0-2021-46913)

Vulnerability from cvelistv5 – Published: 2024-02-27 06:53 – Updated: 2026-05-11 13:44
VLAI
Title
netfilter: nftables: clone set element expression template
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: clone set element expression template memcpy() breaks when using connlimit in set elements. Use nft_expr_clone() to initialize the connlimit expression list, otherwise connlimit garbage collector crashes when walking on the list head copy. [ 493.064656] Workqueue: events_power_efficient nft_rhash_gc [nf_tables] [ 493.064685] RIP: 0010:find_or_evict+0x5a/0x90 [nf_conncount] [ 493.064694] Code: 2b 43 40 83 f8 01 77 0d 48 c7 c0 f5 ff ff ff 44 39 63 3c 75 df 83 6d 18 01 48 8b 43 08 48 89 de 48 8b 13 48 8b 3d ee 2f 00 00 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 03 48 83 [ 493.064699] RSP: 0018:ffffc90000417dc0 EFLAGS: 00010297 [ 493.064704] RAX: 0000000000000000 RBX: ffff888134f38410 RCX: 0000000000000000 [ 493.064708] RDX: 0000000000000000 RSI: ffff888134f38410 RDI: ffff888100060cc0 [ 493.064711] RBP: ffff88812ce594a8 R08: ffff888134f38438 R09: 00000000ebb9025c [ 493.064714] R10: ffffffff8219f838 R11: 0000000000000017 R12: 0000000000000001 [ 493.064718] R13: ffffffff82146740 R14: ffff888134f38410 R15: 0000000000000000 [ 493.064721] FS: 0000000000000000(0000) GS:ffff88840e440000(0000) knlGS:0000000000000000 [ 493.064725] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 493.064729] CR2: 0000000000000008 CR3: 00000001330aa002 CR4: 00000000001706e0 [ 493.064733] Call Trace: [ 493.064737] nf_conncount_gc_list+0x8f/0x150 [nf_conncount] [ 493.064746] nft_rhash_gc+0x106/0x390 [nf_tables]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4094445229760d0d31a4190dfe88fe815c9fc34e , < e51ff3ffc316377cca21de8b80404eed0c37b3c3 (git)
Affected: 4094445229760d0d31a4190dfe88fe815c9fc34e , < 47d8de3c226574a3ddb8b87d0c152028d1bafef4 (git)
Affected: 4094445229760d0d31a4190dfe88fe815c9fc34e , < 4d8f9065830e526c83199186c5f56a6514f457d2 (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.64 , ≤ 5.10.* (semver)
Unaffected: 5.11.16 , ≤ 5.11.* (semver)
Unaffected: 5.12 , ≤ * (original_commit_for_fix)
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      "id": "CVE-2021-46913",
      "lastModified": "2024-11-21T06:34:55.137",
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Use\\nnft_expr_clone() to initialize the connlimit expression list, otherwise\\nconnlimit garbage collector crashes when walking on the list head copy.\\n\\n[  493.064656] Workqueue: events_power_efficient nft_rhash_gc [nf_tables]\\n[  493.064685] RIP: 0010:find_or_evict+0x5a/0x90 [nf_conncount]\\n[  493.064694] Code: 2b 43 40 83 f8 01 77 0d 48 c7 c0 f5 ff ff ff 44 39 63 3c 75 df 83 6d 18 01 48 8b 43 08 48 89 de 48 8b 13 48 8b 3d ee 2f 00 00 \u003c48\u003e 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 03 48 83\\n[  493.064699] RSP: 0018:ffffc90000417dc0 EFLAGS: 00010297\\n[  493.064704] RAX: 0000000000000000 RBX: ffff888134f38410 RCX: 0000000000000000\\n[  493.064708] RDX: 0000000000000000 RSI: ffff888134f38410 RDI: ffff888100060cc0\\n[  493.064711] RBP: ffff88812ce594a8 R08: ffff888134f38438 R09: 00000000ebb9025c\\n[  493.064714] R10: ffffffff8219f838 R11: 0000000000000017 R12: 0000000000000001\\n[  493.064718] R13: ffffffff82146740 R14: ffff888134f38410 R15: 0000000000000000\\n[  493.064721] FS:  0000000000000000(0000) GS:ffff88840e440000(0000) knlGS:0000000000000000\\n[  493.064725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[  493.064729] CR2: 0000000000000008 CR3: 00000001330aa002 CR4: 00000000001706e0\\n[  493.064733] Call Trace:\\n[  493.064737]  nf_conncount_gc_list+0x8f/0x150 [nf_conncount]\\n[  493.064746]  nft_rhash_gc+0x106/0x390 [nf_tables]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nftables: clonar la plantilla de expresi\u00f3n de elementos establecidos memcpy() se rompe cuando se usa connlimit en elementos establecidos. Utilice nft_expr_clone() para inicializar la lista de expresiones connlimit; de lo contrario, el recolector de basura connlimit se bloquea al caminar sobre la copia del encabezado de la lista. [ 493.064656] Cola de trabajo: events_power_ficient nft_rhash_gc [nf_tables] [ 493.064685] RIP: 0010:find_or_evict+0x5a/0x90 [nf_conncount] [ 493.064694] C\u00f3digo: 2b 43 40 83 f8 01 77 0d 48 c7 c0 f5 ff ff ff 44 39 63 3c 75 df 83 6d 18 01 48 8b 43 08 48 89 de 48 8b 13 48 8b 3d ee 2f 00 00 \u0026lt;48\u0026gt; 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 03 48 83 [ 493.064699] RSP : 0018:ffffc90000417dc0 EFLAGS: 00010297 [ 493.064704] RAX: 0000000000000000 RBX: ffff888134f38410 RCX: 00000000000000000 [ 493.064708] RDX: 0000000000000000 RSI: ffff888134f38410 RDI: ffff888100060cc0 [ 493.064711] RBP: ffff88812ce594a8 R08: ffff888134f38438 R09: 00000000ebb9025c [ 49 3.064714] R10: ffffffff8219f838 R11 : 0000000000000017 R12: 0000000000000001 [ 493.064718] R13: ffffffff82146740 R14: ffff888134f38410 R15: 0000000000000000 [ 493.064721] FS : 0000000000000000(0000) GS:ffff88840e440000(0000) knlGS:0000000000000000 [ 493.064725] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 493.064729] CR2: 0000000000000008 CR3: 00000001330aa002 CR4: 00000000001706e0 [ 493.064733] Seguimiento de llamadas: [ 493.064737] nf_conncount_gc_list+0x8f/0x15 0 [nf_conncount] [493.064746] nft_rhash_gc+0x106/0x390 [nf_tables]\"}],\"metrics\":{\"cvssMetricV31\":[{\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7.0\",\"versionEndExcluding\":\"5.10.64\",\"matchCriteriaId\":\"8DD75BE1-7823-4425-A1E2-473E92C55F3E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.11.16\",\"matchCriteriaId\":\"3C5242B9-B5BD-4578-AD66-69DF59D54A14\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/47d8de3c226574a3ddb8b87d0c152028d1bafef4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4d8f9065830e526c83199186c5f56a6514f457d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e51ff3ffc316377cca21de8b80404eed0c37b3c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/47d8de3c226574a3ddb8b87d0c152028d1bafef4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4d8f9065830e526c83199186c5f56a6514f457d2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e51ff3ffc316377cca21de8b80404eed0c37b3c3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e51ff3ffc316377cca21de8b80404eed0c37b3c3\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/47d8de3c226574a3ddb8b87d0c152028d1bafef4\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/4d8f9065830e526c83199186c5f56a6514f457d2\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:17:42.990Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46913\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-07-25T16:05:03.441249Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-25T16:05:08.728Z\"}}], \"cna\": {\"title\": \"netfilter: nftables: clone set element expression template\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4094445229760d0d31a4190dfe88fe815c9fc34e\", \"lessThan\": \"e51ff3ffc316377cca21de8b80404eed0c37b3c3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4094445229760d0d31a4190dfe88fe815c9fc34e\", \"lessThan\": \"47d8de3c226574a3ddb8b87d0c152028d1bafef4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4094445229760d0d31a4190dfe88fe815c9fc34e\", \"lessThan\": \"4d8f9065830e526c83199186c5f56a6514f457d2\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nf_tables_api.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nf_tables_api.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e51ff3ffc316377cca21de8b80404eed0c37b3c3\"}, {\"url\": \"https://git.kernel.org/stable/c/47d8de3c226574a3ddb8b87d0c152028d1bafef4\"}, {\"url\": \"https://git.kernel.org/stable/c/4d8f9065830e526c83199186c5f56a6514f457d2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nftables: clone set element expression template\\n\\nmemcpy() breaks when using connlimit in set elements. Use\\nnft_expr_clone() to initialize the connlimit expression list, otherwise\\nconnlimit garbage collector crashes when walking on the list head copy.\\n\\n[  493.064656] Workqueue: events_power_efficient nft_rhash_gc [nf_tables]\\n[  493.064685] RIP: 0010:find_or_evict+0x5a/0x90 [nf_conncount]\\n[  493.064694] Code: 2b 43 40 83 f8 01 77 0d 48 c7 c0 f5 ff ff ff 44 39 63 3c 75 df 83 6d 18 01 48 8b 43 08 48 89 de 48 8b 13 48 8b 3d ee 2f 00 00 \u003c48\u003e 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 03 48 83\\n[  493.064699] RSP: 0018:ffffc90000417dc0 EFLAGS: 00010297\\n[  493.064704] RAX: 0000000000000000 RBX: ffff888134f38410 RCX: 0000000000000000\\n[  493.064708] RDX: 0000000000000000 RSI: ffff888134f38410 RDI: ffff888100060cc0\\n[  493.064711] RBP: ffff88812ce594a8 R08: ffff888134f38438 R09: 00000000ebb9025c\\n[  493.064714] R10: ffffffff8219f838 R11: 0000000000000017 R12: 0000000000000001\\n[  493.064718] R13: ffffffff82146740 R14: ffff888134f38410 R15: 0000000000000000\\n[  493.064721] FS:  0000000000000000(0000) GS:ffff88840e440000(0000) knlGS:0000000000000000\\n[  493.064725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[  493.064729] CR2: 0000000000000008 CR3: 00000001330aa002 CR4: 00000000001706e0\\n[  493.064733] Call Trace:\\n[  493.064737]  nf_conncount_gc_list+0x8f/0x150 [nf_conncount]\\n[  493.064746]  nft_rhash_gc+0x106/0x390 [nf_tables]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.64\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.16\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:44:18.810Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46913\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:44:18.810Z\", \"dateReserved\": \"2024-02-25T13:45:52.718Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T06:53:52.780Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.