CVE-2021-47129 (GCVE-0-2021-47129)

Vulnerability from cvelistv5 – Published: 2024-03-15 20:14 – Updated: 2026-05-11 13:48
VLAI
Title
netfilter: nft_ct: skip expectations for confirmed conntrack
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_ct: skip expectations for confirmed conntrack nft_ct_expect_obj_eval() calls nf_ct_ext_add() for a confirmed conntrack entry. However, nf_ct_ext_add() can only be called for !nf_ct_is_confirmed(). [ 1825.349056] WARNING: CPU: 0 PID: 1279 at net/netfilter/nf_conntrack_extend.c:48 nf_ct_xt_add+0x18e/0x1a0 [nf_conntrack] [ 1825.351391] RIP: 0010:nf_ct_ext_add+0x18e/0x1a0 [nf_conntrack] [ 1825.351493] Code: 41 5c 41 5d 41 5e 41 5f c3 41 bc 0a 00 00 00 e9 15 ff ff ff ba 09 00 00 00 31 f6 4c 89 ff e8 69 6c 3d e9 eb 96 45 31 ed eb cd <0f> 0b e9 b1 fe ff ff e8 86 79 14 e9 eb bf 0f 1f 40 00 0f 1f 44 00 [ 1825.351721] RSP: 0018:ffffc90002e1f1e8 EFLAGS: 00010202 [ 1825.351790] RAX: 000000000000000e RBX: ffff88814f5783c0 RCX: ffffffffc0e4f887 [ 1825.351881] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88814f578440 [ 1825.351971] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88814f578447 [ 1825.352060] R10: ffffed1029eaf088 R11: 0000000000000001 R12: ffff88814f578440 [ 1825.352150] R13: ffff8882053f3a00 R14: 0000000000000000 R15: 0000000000000a20 [ 1825.352240] FS: 00007f992261c900(0000) GS:ffff889faec00000(0000) knlGS:0000000000000000 [ 1825.352343] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1825.352417] CR2: 000056070a4d1158 CR3: 000000015efe0000 CR4: 0000000000350ee0 [ 1825.352508] Call Trace: [ 1825.352544] nf_ct_helper_ext_add+0x10/0x60 [nf_conntrack] [ 1825.352641] nft_ct_expect_obj_eval+0x1b8/0x1e0 [nft_ct] [ 1825.352716] nft_do_chain+0x232/0x850 [nf_tables] Add the ct helper extension only for unconfirmed conntrack. Skip rule evaluation if the ct helper extension does not exist. Thus, you can only create expectations from the first packet. It should be possible to remove this limitation by adding a new action to attach a generic ct helper to the first packet. Then, use this ct helper extension from follow up packets to create the ct expectation. While at it, add a missing check to skip the template conntrack too and remove check for IPCT_UNTRACK which is implicit to !ct.
Severity
4.6 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-273 - Improper Check for Dropped Privileges
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 857b46027d6f91150797295752581b7155b9d0e1 , < da8d31e80ff425f5a65dab7060d5c4aba749e562 (git)
Affected: 857b46027d6f91150797295752581b7155b9d0e1 , < 5f3429c05e4028a0e241afdad856dd15dec2ffb9 (git)
Affected: 857b46027d6f91150797295752581b7155b9d0e1 , < 2c0e6b35b88a961127066a1028bce9c727cbc3e5 (git)
Affected: 857b46027d6f91150797295752581b7155b9d0e1 , < 1710eb913bdcda3917f44d383c32de6bdabfc836 (git)
Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.125 , ≤ 5.4.* (semver)
Unaffected: 5.10.43 , ≤ 5.10.* (semver)
Unaffected: 5.12.10 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nft_ct: skip expectations for confirmed conntrack\\n\\nnft_ct_expect_obj_eval() calls nf_ct_ext_add() for a confirmed\\nconntrack entry. However, nf_ct_ext_add() can only be called for\\n!nf_ct_is_confirmed().\\n\\n[ 1825.349056] WARNING: CPU: 0 PID: 1279 at net/netfilter/nf_conntrack_extend.c:48 nf_ct_xt_add+0x18e/0x1a0 [nf_conntrack]\\n[ 1825.351391] RIP: 0010:nf_ct_ext_add+0x18e/0x1a0 [nf_conntrack]\\n[ 1825.351493] Code: 41 5c 41 5d 41 5e 41 5f c3 41 bc 0a 00 00 00 e9 15 ff ff ff ba 09 00 00 00 31 f6 4c 89 ff e8 69 6c 3d e9 eb 96 45 31 ed eb cd \u003c0f\u003e 0b e9 b1 fe ff ff e8 86 79 14 e9 eb bf 0f 1f 40 00 0f 1f 44 00\\n[ 1825.351721] RSP: 0018:ffffc90002e1f1e8 EFLAGS: 00010202\\n[ 1825.351790] RAX: 000000000000000e RBX: ffff88814f5783c0 RCX: ffffffffc0e4f887\\n[ 1825.351881] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88814f578440\\n[ 1825.351971] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88814f578447\\n[ 1825.352060] R10: ffffed1029eaf088 R11: 0000000000000001 R12: ffff88814f578440\\n[ 1825.352150] R13: ffff8882053f3a00 R14: 0000000000000000 R15: 0000000000000a20\\n[ 1825.352240] FS:  00007f992261c900(0000) GS:ffff889faec00000(0000) knlGS:0000000000000000\\n[ 1825.352343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[ 1825.352417] CR2: 000056070a4d1158 CR3: 000000015efe0000 CR4: 0000000000350ee0\\n[ 1825.352508] Call Trace:\\n[ 1825.352544]  nf_ct_helper_ext_add+0x10/0x60 [nf_conntrack]\\n[ 1825.352641]  nft_ct_expect_obj_eval+0x1b8/0x1e0 [nft_ct]\\n[ 1825.352716]  nft_do_chain+0x232/0x850 [nf_tables]\\n\\nAdd the ct helper extension only for unconfirmed conntrack. Skip rule\\nevaluation if the ct helper extension does not exist. Thus, you can\\nonly create expectations from the first packet.\\n\\nIt should be possible to remove this limitation by adding a new action\\nto attach a generic ct helper to the first packet. Then, use this ct\\nhelper extension from follow up packets to create the ct expectation.\\n\\nWhile at it, add a missing check to skip the template conntrack too\\nand remove check for IPCT_UNTRACK which is implicit to !ct.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nft_ct: omitir expectativas para conntrack confirmado nft_ct_expect_obj_eval() llama a nf_ct_ext_add() para una entrada de conntrack confirmada. Sin embargo, nf_ct_ext_add() solo se puede invocar para !nf_ct_is_confirmed(). [1825.349056] ADVERTENCIA: CPU: 0 PID: 1279 en net/netfilter/nf_conntrack_extend.c:48 nf_ct_xt_add+0x18e/0x1a0 [nf_conntrack] [1825.351391] RIP: 0010:nf_ct_ext_add+0x18e/0x 1a0 [nf_conntrack] [ 1825.351493] C\\u00f3digo: 41 5c 41 5d 41 5e 41 5f c3 41 bc 0a 00 00 00 e9 15 ff ff ff ba 09 00 00 00 31 f6 4c 89 ff e8 69 6c 3d e9 eb 96 45 31 ed eb cd \u0026lt;0f\u0026gt; 0b e9 b1 fe ff ff e8 86 79 14 e9 eb bf 0f 1f 40 00 0f 1f 44 00 [ 1825.351721] RSP: 0018:ffffc90002e1f1e8 EFLAGS: 00010202 [ 1825.351790] RAX: 00000000000000 0e RBX: ffff88814f5783c0 RCX: ffffffffc0e4f887 [ 1825.351881] RDX: dffffc0000000000 RSI: 00000000000000008 RDI: ffff88814f578440 [ 1825.351971] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88814f578447 [ 1825.352060] R10: ffffed1029eaf088 R11: 00000000000000 01 R12: ffff88814f578440 [ 1825.352150] R13: ffff8882053f3a00 R14: 0000000000000000 R15: 0000000000000a20 [ 1825.352240] FS: 00007f99226 1c900(0000) GS:ffff889faec00000(0000 ) knlGS:0000000000000000 [ 1825.352343] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1825.352417] CR2: 000056070a4d1158 CR3: 00000001 5efe0000 CR4: 0000000000350ee0 [1825.352508] Seguimiento de llamadas: [1825.352544] nf_ct_helper_ext_add+0x10/0x60 [nf_conntrack] [1825.352641 ] nft_ct_expect_obj_eval+0x1b8/0x1e0 [nft_ct] [ 1825.352716] nft_do_chain+0x232/0x850 [nf_tables] Agregue la extensi\\u00f3n ct helper solo para conntrack no confirmado. Omita la evaluaci\\u00f3n de la regla si la extensi\\u00f3n ct helper no existe. Por lo tanto, s\\u00f3lo puedes crear expectativas desde el primer paquete. Deber\\u00eda ser posible eliminar esta limitaci\\u00f3n agregando una nueva acci\\u00f3n para adjuntar un asistente ct gen\\u00e9rico al primer paquete. Luego, use esta extensi\\u00f3n de ayuda de ct de los paquetes de seguimiento para crear la expectativa de ct. Mientras lo hace, agregue una marca faltante para omitir tambi\\u00e9n la plantilla conntrack y elimine la marca IPCT_UNTRACK que est\\u00e1 impl\\u00edcita en !ct.\"}]",
      "id": "CVE-2021-47129",
      "lastModified": "2024-11-21T06:35:27.327",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N\", \"baseScore\": 4.6, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 2.1, \"impactScore\": 2.5}]}",
      "published": "2024-03-15T21:15:07.523",
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      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis",
      "weaknesses": "[{\"source\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-273\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47129\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-15T21:15:07.523\",\"lastModified\":\"2026-06-17T04:16:35.870\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nft_ct: skip expectations for confirmed conntrack\\n\\nnft_ct_expect_obj_eval() calls nf_ct_ext_add() for a confirmed\\nconntrack entry. However, nf_ct_ext_add() can only be called for\\n!nf_ct_is_confirmed().\\n\\n[ 1825.349056] WARNING: CPU: 0 PID: 1279 at net/netfilter/nf_conntrack_extend.c:48 nf_ct_xt_add+0x18e/0x1a0 [nf_conntrack]\\n[ 1825.351391] RIP: 0010:nf_ct_ext_add+0x18e/0x1a0 [nf_conntrack]\\n[ 1825.351493] Code: 41 5c 41 5d 41 5e 41 5f c3 41 bc 0a 00 00 00 e9 15 ff ff ff ba 09 00 00 00 31 f6 4c 89 ff e8 69 6c 3d e9 eb 96 45 31 ed eb cd \u003c0f\u003e 0b e9 b1 fe ff ff e8 86 79 14 e9 eb bf 0f 1f 40 00 0f 1f 44 00\\n[ 1825.351721] RSP: 0018:ffffc90002e1f1e8 EFLAGS: 00010202\\n[ 1825.351790] RAX: 000000000000000e RBX: ffff88814f5783c0 RCX: ffffffffc0e4f887\\n[ 1825.351881] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88814f578440\\n[ 1825.351971] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88814f578447\\n[ 1825.352060] R10: ffffed1029eaf088 R11: 0000000000000001 R12: ffff88814f578440\\n[ 1825.352150] R13: ffff8882053f3a00 R14: 0000000000000000 R15: 0000000000000a20\\n[ 1825.352240] FS:  00007f992261c900(0000) GS:ffff889faec00000(0000) knlGS:0000000000000000\\n[ 1825.352343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[ 1825.352417] CR2: 000056070a4d1158 CR3: 000000015efe0000 CR4: 0000000000350ee0\\n[ 1825.352508] Call Trace:\\n[ 1825.352544]  nf_ct_helper_ext_add+0x10/0x60 [nf_conntrack]\\n[ 1825.352641]  nft_ct_expect_obj_eval+0x1b8/0x1e0 [nft_ct]\\n[ 1825.352716]  nft_do_chain+0x232/0x850 [nf_tables]\\n\\nAdd the ct helper extension only for unconfirmed conntrack. Skip rule\\nevaluation if the ct helper extension does not exist. Thus, you can\\nonly create expectations from the first packet.\\n\\nIt should be possible to remove this limitation by adding a new action\\nto attach a generic ct helper to the first packet. Then, use this ct\\nhelper extension from follow up packets to create the ct expectation.\\n\\nWhile at it, add a missing check to skip the template conntrack too\\nand remove check for IPCT_UNTRACK which is implicit to !ct.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nft_ct: omitir expectativas para conntrack confirmado nft_ct_expect_obj_eval() llama a nf_ct_ext_add() para una entrada de conntrack confirmada. Sin embargo, nf_ct_ext_add() solo se puede invocar para !nf_ct_is_confirmed(). [1825.349056] ADVERTENCIA: CPU: 0 PID: 1279 en net/netfilter/nf_conntrack_extend.c:48 nf_ct_xt_add+0x18e/0x1a0 [nf_conntrack] [1825.351391] RIP: 0010:nf_ct_ext_add+0x18e/0x 1a0 [nf_conntrack] [ 1825.351493] C\u00f3digo: 41 5c 41 5d 41 5e 41 5f c3 41 bc 0a 00 00 00 e9 15 ff ff ff ba 09 00 00 00 31 f6 4c 89 ff e8 69 6c 3d e9 eb 96 45 31 ed eb cd \u0026lt;0f\u0026gt; 0b e9 b1 fe ff ff e8 86 79 14 e9 eb bf 0f 1f 40 00 0f 1f 44 00 [ 1825.351721] RSP: 0018:ffffc90002e1f1e8 EFLAGS: 00010202 [ 1825.351790] RAX: 00000000000000 0e RBX: ffff88814f5783c0 RCX: ffffffffc0e4f887 [ 1825.351881] RDX: dffffc0000000000 RSI: 00000000000000008 RDI: ffff88814f578440 [ 1825.351971] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88814f578447 [ 1825.352060] R10: ffffed1029eaf088 R11: 00000000000000 01 R12: ffff88814f578440 [ 1825.352150] R13: ffff8882053f3a00 R14: 0000000000000000 R15: 0000000000000a20 [ 1825.352240] FS: 00007f99226 1c900(0000) GS:ffff889faec00000(0000 ) knlGS:0000000000000000 [ 1825.352343] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1825.352417] CR2: 000056070a4d1158 CR3: 00000001 5efe0000 CR4: 0000000000350ee0 [1825.352508] Seguimiento de llamadas: [1825.352544] nf_ct_helper_ext_add+0x10/0x60 [nf_conntrack] [1825.352641 ] nft_ct_expect_obj_eval+0x1b8/0x1e0 [nft_ct] [ 1825.352716] nft_do_chain+0x232/0x850 [nf_tables] Agregue la extensi\u00f3n ct helper solo para conntrack no confirmado. Omita la evaluaci\u00f3n de la regla si la extensi\u00f3n ct helper no existe. Por lo tanto, s\u00f3lo puedes crear expectativas desde el primer paquete. Deber\u00eda ser posible eliminar esta limitaci\u00f3n agregando una nueva acci\u00f3n para adjuntar un asistente ct gen\u00e9rico al primer paquete. Luego, use esta extensi\u00f3n de ayuda de ct de los paquetes de seguimiento para crear la expectativa de ct. Mientras lo hace, agregue una marca faltante para omitir tambi\u00e9n la plantilla conntrack y elimine la marca IPCT_UNTRACK que est\u00e1 impl\u00edcita en !ct.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/nft_ct.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"857b46027d6f91150797295752581b7155b9d0e1\",\"lessThan\":\"da8d31e80ff425f5a65dab7060d5c4aba749e562\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"857b46027d6f91150797295752581b7155b9d0e1\",\"lessThan\":\"5f3429c05e4028a0e241afdad856dd15dec2ffb9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"857b46027d6f91150797295752581b7155b9d0e1\",\"lessThan\":\"2c0e6b35b88a961127066a1028bce9c727cbc3e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"857b46027d6f91150797295752581b7155b9d0e1\",\"lessThan\":\"1710eb913bdcda3917f44d383c32de6bdabfc836\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/nft_ct.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.125\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.43\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.12.10\",\"lessThanOrEqual\":\"5.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N\",\"baseScore\":4.6,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.1,\"impactScore\":2.5}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-03-19T16:02:32.498750Z\",\"id\":\"CVE-2021-47129\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-273\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.3\",\"versionEndExcluding\":\"5.4.125\",\"matchCriteriaId\":\"A7346D80-57B1-4BA2-9844-4EB353EC1DFF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.43\",\"matchCriteriaId\":\"B2136BD5-4F86-40C8-96C8-5C90A015490C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.12.10\",\"matchCriteriaId\":\"27384800-AB48-4C08-891E-34B66F5FC4AA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"96AC23B2-D46A-49D9-8203-8E1BEDCA8532\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"DA610E30-717C-4700-9F77-A3C9244F3BFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"1ECD33F5-85BE-430B-8F86-8D7BD560311D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1710eb913bdcda3917f44d383c32de6bdabfc836\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2c0e6b35b88a961127066a1028bce9c727cbc3e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5f3429c05e4028a0e241afdad856dd15dec2ffb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/da8d31e80ff425f5a65dab7060d5c4aba749e562\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1710eb913bdcda3917f44d383c32de6bdabfc836\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2c0e6b35b88a961127066a1028bce9c727cbc3e5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5f3429c05e4028a0e241afdad856dd15dec2ffb9\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/da8d31e80ff425f5a65dab7060d5c4aba749e562\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:46:11+00:00",
      "cve": "CVE-2021-47129",
      "id": "CVE-2021-47129",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nft_ct: skip expectations for confirmed conntrack",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47129.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/da8d31e80ff425f5a65dab7060d5c4aba749e562\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5f3429c05e4028a0e241afdad856dd15dec2ffb9\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2c0e6b35b88a961127066a1028bce9c727cbc3e5\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/1710eb913bdcda3917f44d383c32de6bdabfc836\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:39.894Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.6, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47129\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-19T16:02:32.498750Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-273\", \"description\": \"CWE-273 Improper Check for Dropped Privileges\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:18.845Z\"}}], \"cna\": {\"title\": \"netfilter: nft_ct: skip expectations for confirmed conntrack\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"857b46027d6f91150797295752581b7155b9d0e1\", \"lessThan\": \"da8d31e80ff425f5a65dab7060d5c4aba749e562\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"857b46027d6f91150797295752581b7155b9d0e1\", \"lessThan\": \"5f3429c05e4028a0e241afdad856dd15dec2ffb9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"857b46027d6f91150797295752581b7155b9d0e1\", \"lessThan\": \"2c0e6b35b88a961127066a1028bce9c727cbc3e5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"857b46027d6f91150797295752581b7155b9d0e1\", \"lessThan\": \"1710eb913bdcda3917f44d383c32de6bdabfc836\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nft_ct.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.3\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.3\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.125\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.43\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nft_ct.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/da8d31e80ff425f5a65dab7060d5c4aba749e562\"}, {\"url\": \"https://git.kernel.org/stable/c/5f3429c05e4028a0e241afdad856dd15dec2ffb9\"}, {\"url\": \"https://git.kernel.org/stable/c/2c0e6b35b88a961127066a1028bce9c727cbc3e5\"}, {\"url\": \"https://git.kernel.org/stable/c/1710eb913bdcda3917f44d383c32de6bdabfc836\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nft_ct: skip expectations for confirmed conntrack\\n\\nnft_ct_expect_obj_eval() calls nf_ct_ext_add() for a confirmed\\nconntrack entry. However, nf_ct_ext_add() can only be called for\\n!nf_ct_is_confirmed().\\n\\n[ 1825.349056] WARNING: CPU: 0 PID: 1279 at net/netfilter/nf_conntrack_extend.c:48 nf_ct_xt_add+0x18e/0x1a0 [nf_conntrack]\\n[ 1825.351391] RIP: 0010:nf_ct_ext_add+0x18e/0x1a0 [nf_conntrack]\\n[ 1825.351493] Code: 41 5c 41 5d 41 5e 41 5f c3 41 bc 0a 00 00 00 e9 15 ff ff ff ba 09 00 00 00 31 f6 4c 89 ff e8 69 6c 3d e9 eb 96 45 31 ed eb cd \u003c0f\u003e 0b e9 b1 fe ff ff e8 86 79 14 e9 eb bf 0f 1f 40 00 0f 1f 44 00\\n[ 1825.351721] RSP: 0018:ffffc90002e1f1e8 EFLAGS: 00010202\\n[ 1825.351790] RAX: 000000000000000e RBX: ffff88814f5783c0 RCX: ffffffffc0e4f887\\n[ 1825.351881] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88814f578440\\n[ 1825.351971] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88814f578447\\n[ 1825.352060] R10: ffffed1029eaf088 R11: 0000000000000001 R12: ffff88814f578440\\n[ 1825.352150] R13: ffff8882053f3a00 R14: 0000000000000000 R15: 0000000000000a20\\n[ 1825.352240] FS:  00007f992261c900(0000) GS:ffff889faec00000(0000) knlGS:0000000000000000\\n[ 1825.352343] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[ 1825.352417] CR2: 000056070a4d1158 CR3: 000000015efe0000 CR4: 0000000000350ee0\\n[ 1825.352508] Call Trace:\\n[ 1825.352544]  nf_ct_helper_ext_add+0x10/0x60 [nf_conntrack]\\n[ 1825.352641]  nft_ct_expect_obj_eval+0x1b8/0x1e0 [nft_ct]\\n[ 1825.352716]  nft_do_chain+0x232/0x850 [nf_tables]\\n\\nAdd the ct helper extension only for unconfirmed conntrack. Skip rule\\nevaluation if the ct helper extension does not exist. Thus, you can\\nonly create expectations from the first packet.\\n\\nIt should be possible to remove this limitation by adding a new action\\nto attach a generic ct helper to the first packet. Then, use this ct\\nhelper extension from follow up packets to create the ct expectation.\\n\\nWhile at it, add a missing check to skip the template conntrack too\\nand remove check for IPCT_UNTRACK which is implicit to !ct.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.125\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.43\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.10\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:04:42.677Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47129\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:04:42.677Z\", \"dateReserved\": \"2024-03-04T18:12:48.839Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-15T20:14:33.102Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.