CVE-2021-47394

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nftables is fully usable per-netns.\nUI:N - Exploitation needs no victim action; the attacker creates the owned table, drives concurrent GET requests, and closes their own netlink socket to trigger the UAF.\nS:U - Impact is confined to the local kernel privilege boundary (heap UAF / local privilege escalation) with no VM, IOMMU, or cross-authority escape.\nC:H - The race frees the still-linked nft_table (and its name/contents) while lockless nft_table_lookup reads it via nla_strcmp; this classic UAF enables heap spray and arbitrary kernel read primitives.\nI:H - __nft_release_table destroys the table and nested objects while concurrent GET paths can still observe and follow those pointers, yielding reclaimable UAF/write primitives suitable for control-flow hijacking.\nA:H - Use-after-free of the table during GET lookup causes kernel oops/panic (as shown by the KASAN report in memcmp/nla_strcmp), and the attacker can trigger it repeatedly."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_tables_api.c"], "versions": [{"version": "6001a930ce0378b62210d4f83583fc88a903d89d", "lessThan": "f65c73d3aabb87d4353e0bc4a718b5ae8c43fd04", "status": "affected", "versionType": "git"}, {"version": "6001a930ce0378b62210d4f83583fc88a903d89d", "lessThan": "a499b03bf36b0c2e3b958a381d828678ab0ffc5e", "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/netfilter/nf_tables_api.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.10", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "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": "5.12", "versionEndExcluding": "5.14.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f65c73d3aabb87d4353e0bc4a718b5ae8c43fd04"}, {"url": "https://git.kernel.org/stable/c/a499b03bf36b0c2e3b958a381d828678ab0ffc5e"}], "title": "netfilter: nf_tables: unlink table before deleting it", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47394", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-28T18:27:57.258962Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:40.569Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.375Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/f65c73d3aabb87d4353e0bc4a718b5ae8c43fd04", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a499b03bf36b0c2e3b958a381d828678ab0ffc5e", "tags": ["x_transferred"]}]}]}}

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nftables is fully usable per-netns.\nUI:N - Exploitation needs no victim action; the attacker creates the owned table, drives concurrent GET requests, and closes their own netlink socket to trigger the UAF.\nS:U - Impact is confined to the local kernel privilege boundary (heap UAF / local privilege escalation) with no VM, IOMMU, or cross-authority escape.\nC:H - The race frees the still-linked nft_table (and its name/contents) while lockless nft_table_lookup reads it via nla_strcmp; this classic UAF enables heap spray and arbitrary kernel read primitives.\nI:H - __nft_release_table destroys the table and nested objects while concurrent GET paths can still observe and follow those pointers, yielding reclaimable UAF/write primitives suitable for control-flow hijacking.\nA:H - Use-after-free of the table during GET lookup causes kernel oops/panic (as shown by the KASAN report in memcmp/nla_strcmp), and the attacker can trigger it repeatedly."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6001a930ce0378b62210d4f83583fc88a903d89d", "lessThan": "f65c73d3aabb87d4353e0bc4a718b5ae8c43fd04", "versionType": "git"}, {"status": "affected", "version": "6001a930ce0378b62210d4f83583fc88a903d89d", "lessThan": "a499b03bf36b0c2e3b958a381d828678ab0ffc5e", "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": "5.12"}, {"status": "unaffected", "version": "0", "lessThan": "5.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.14.10", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/netfilter/nf_tables_api.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/f65c73d3aabb87d4353e0bc4a718b5ae8c43fd04"}, {"url": "https://git.kernel.org/stable/c/a499b03bf36b0c2e3b958a381d828678ab0ffc5e"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: unlink table before deleting it\n\nsyzbot reports following UAF:\nBUG: KASAN: use-after-free in memcmp+0x18f/0x1c0 lib/string.c:955\n nla_strcmp+0xf2/0x130 lib/nlattr.c:836\n nft_table_lookup.part.0+0x1a2/0x460 net/netfilter/nf_tables_api.c:570\n nft_table_lookup net/netfilter/nf_tables_api.c:4064 [inline]\n nf_tables_getset+0x1b3/0x860 net/netfilter/nf_tables_api.c:4064\n nfnetlink_rcv_msg+0x659/0x13f0 net/netfilter/nfnetlink.c:285\n netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\n\nProblem is that all get operations are lockless, so the commit_mutex\nheld by nft_rcv_nl_event() isn't enough to stop a parallel GET request\nfrom doing read-accesses to the table object even after synchronize_rcu().\n\nTo avoid this, unlink the table first and store the table objects in\non-stack scratch space."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.10", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "5.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:37.812Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47394", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:47:37.812Z", "dateReserved": "2024-05-21T14:58:30.814Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:03:51.503Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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UAF: BUG: KASAN: use-after-free en memcmp+0x18f/0x1c0 lib/string.c:955 nla_strcmp+ 0xf2/0x130 lib/nlattr.c:836 nft_table_lookup.part.0+0x1a2/0x460 net/netfilter/nf_tables_api.c:570 nft_table_lookup net/netfilter/nf_tables_api.c:4064 [en l\u00ednea] nf_tables_getset+0x1b3/0x860 net /filtro de red/ nf_tables_api.c:4064 nfnetlink_rcv_msg+0x659/0x13f0 net/netfilter/nfnetlink.c:285 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 El problema es que todas las operaciones de obtenci\u00f3n no tienen bloqueo, por lo que el commit_mutex mantenido por () no es suficiente para evitar que una solicitud GET paralela realice accesos de lectura al objeto de la tabla incluso despu\u00e9s de sincronizar_rcu(). Para evitar esto, primero desvincule la tabla y almacene los objetos de la tabla en el espacio temporal de la pila."}], "id": "CVE-2021-47394", "lastModified": "2026-08-04T10:17:01.600", "metrics": {"cvssMetricV31": [{"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": "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-2021-47394", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-28T18:27:57.258962Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:24.710", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a499b03bf36b0c2e3b958a381d828678ab0ffc5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f65c73d3aabb87d4353e0bc4a718b5ae8c43fd04"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a499b03bf36b0c2e3b958a381d828678ab0ffc5e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f65c73d3aabb87d4353e0bc4a718b5ae8c43fd04"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfilter: nf_tables: unlink table before deleting it", "id": "2282344", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282344"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nf_tables: unlink table before deleting it\nsyzbot reports following UAF:\nBUG: KASAN: use-after-free in memcmp+0x18f/0x1c0 lib/string.c:955\nnla_strcmp+0xf2/0x130 lib/nlattr.c:836\nnft_table_lookup.part.0+0x1a2/0x460 net/netfilter/nf_tables_api.c:570\nnft_table_lookup net/netfilter/nf_tables_api.c:4064 [inline]\nnf_tables_getset+0x1b3/0x860 net/netfilter/nf_tables_api.c:4064\nnfnetlink_rcv_msg+0x659/0x13f0 net/netfilter/nfnetlink.c:285\nnetlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504\nProblem is that all get operations are lockless, so the commit_mutex\nheld by nft_rcv_nl_event() isn't enough to stop a parallel GET request\nfrom doing read-accesses to the table object even after synchronize_rcu().\nTo avoid this, unlink the table first and store the table objects in\non-stack scratch space."], "name": "CVE-2021-47394", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47394\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47394\nhttps://lore.kernel.org/linux-cve-announce/2024052147-CVE-2021-47394-9ec5@gregkh/T"], "threat_severity": "Moderate"}

{}