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CVE-2021-47546 (GCVE-0-2021-47546)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:09 – Updated: 2026-05-23 15:20
VLAI
Title
ipv6: fix memory leak in fib6_rule_suppress
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix memory leak in fib6_rule_suppress The kernel leaks memory when a `fib` rule is present in IPv6 nftables firewall rules and a suppress_prefix rule is present in the IPv6 routing rules (used by certain tools such as wg-quick). In such scenarios, every incoming packet will leak an allocation in `ip6_dst_cache` slab cache. After some hours of `bpftrace`-ing and source code reading, I tracked down the issue to ca7a03c41753 ("ipv6: do not free rt if FIB_LOOKUP_NOREF is set on suppress rule"). The problem with that change is that the generic `args->flags` always have `FIB_LOOKUP_NOREF` set[1][2] but the IPv6-specific flag `RT6_LOOKUP_F_DST_NOREF` might not be, leading to `fib6_rule_suppress` not decreasing the refcount when needed. How to reproduce: - Add the following nftables rule to a prerouting chain: meta nfproto ipv6 fib saddr . mark . iif oif missing drop This can be done with: sudo nft create table inet test sudo nft create chain inet test test_chain '{ type filter hook prerouting priority filter + 10; policy accept; }' sudo nft add rule inet test test_chain meta nfproto ipv6 fib saddr . mark . iif oif missing drop - Run: sudo ip -6 rule add table main suppress_prefixlength 0 - Watch `sudo slabtop -o | grep ip6_dst_cache` to see memory usage increase with every incoming ipv6 packet. This patch exposes the protocol-specific flags to the protocol specific `suppress` function, and check the protocol-specific `flags` argument for RT6_LOOKUP_F_DST_NOREF instead of the generic FIB_LOOKUP_NOREF when decreasing the refcount, like this. [1]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L71 [2]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L99
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 17:34 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ca7a03c4175366a92cee0ccc4fec0038c3266e26 , < ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29 (git)
Affected: ca7a03c4175366a92cee0ccc4fec0038c3266e26 , < 209d35ee34e25f9668c404350a1c86d914c54ffa (git)
Affected: ca7a03c4175366a92cee0ccc4fec0038c3266e26 , < 8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 (git)
Affected: ca7a03c4175366a92cee0ccc4fec0038c3266e26 , < cdef485217d30382f3bf6448c54b4401648fe3f1 (git)
Affected: d37c966752043733eb847dd897d6e3405084c559 (git)
Affected: ecc265624956ea784cb2bd2b31a95bd54c4f5f13 (git)
Affected: 5.2.19 , < 5.3 (semver)
Affected: 5.3.4 , < 5.4 (semver)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.164 , ≤ 5.4.* (semver)
Unaffected: 5.10.84 , ≤ 5.10.* (semver)
Unaffected: 5.15.7 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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In such scenarios, every\\nincoming packet will leak an allocation in `ip6_dst_cache` slab cache.\\n\\nAfter some hours of `bpftrace`-ing and source code reading, I tracked\\ndown the issue to ca7a03c41753 (\\\"ipv6: do not free rt if\\nFIB_LOOKUP_NOREF is set on suppress rule\\\").\\n\\nThe problem with that change is that the generic `args-\u003eflags` always have\\n`FIB_LOOKUP_NOREF` set[1][2] but the IPv6-specific flag\\n`RT6_LOOKUP_F_DST_NOREF` might not be, leading to `fib6_rule_suppress` not\\ndecreasing the refcount when needed.\\n\\nHow to reproduce:\\n - Add the following nftables rule to a prerouting chain:\\n     meta nfproto ipv6 fib saddr . mark . iif oif missing drop\\n   This can be done with:\\n     sudo nft create table inet test\\n     sudo nft create chain inet test test_chain \u0027{ type filter hook prerouting priority filter + 10; policy accept; }\u0027\\n     sudo nft add rule inet test test_chain meta nfproto ipv6 fib saddr . mark . iif oif missing drop\\n - Run:\\n     sudo ip -6 rule add table main suppress_prefixlength 0\\n - Watch `sudo slabtop -o | grep ip6_dst_cache` to see memory usage increase\\n   with every incoming ipv6 packet.\\n\\nThis patch exposes the protocol-specific flags to the protocol\\nspecific `suppress` function, and check the protocol-specific `flags`\\nargument for RT6_LOOKUP_F_DST_NOREF instead of the generic\\nFIB_LOOKUP_NOREF when decreasing the refcount, like this.\\n\\n[1]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L71\\n[2]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L99\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ipv6: corrige la p\u00e9rdida de memoria en fib6_rule_suppress El kernel pierde memoria cuando una regla `fib` est\u00e1 presente en las reglas de firewall de nftables de IPv6 y una regla de supresi\u00f3n_prefix est\u00e1 presente en las reglas de enrutamiento de IPv6 (utilizadas por ciertas herramientas como wg-quick). En tales escenarios, cada paquete entrante perder\u00e1 una asignaci\u00f3n en el cach\u00e9 de losa `ip6_dst_cache`. Despu\u00e9s de algunas horas de `bpftrace`-ing y lectura del c\u00f3digo fuente, rastre\u00e9 el problema hasta ca7a03c41753 (\\\"ipv6: no libere rt si FIB_LOOKUP_NOREF est\u00e1 configurado en la regla de supresi\u00f3n\\\"). El problema con ese cambio es que los `args-\u0026gt;flags` gen\u00e9ricos siempre tienen `FIB_LOOKUP_NOREF` configurado[1][2] pero el indicador espec\u00edfico de IPv6 `RT6_LOOKUP_F_DST_NOREF` podr\u00eda no estarlo, lo que lleva a que `fib6_rule_suppress` no disminuya el recuento cuando necesario. C\u00f3mo reproducir: - Agregue la siguiente regla nftables a una cadena de enrutamiento previo: meta nfproto ipv6 fib saddr. marca . iif oif falta gota Esto se puede hacer con: sudo nft create table inet test sudo nft create chain inet test test_chain \u0027{ tipo filtro gancho prerouting filtro de prioridad + 10; aceptar pol\u00edtica; }\u0027 sudo nft agregar regla inet test test_chain meta nfproto ipv6 fib saddr. marca . iif oif falta gota - Ejecutar: sudo ip -6 regla agregar tabla principal suprimir_prefixlength 0 - Ver `sudo slabtop -o | grep ip6_dst_cache` para ver el aumento del uso de memoria con cada paquete ipv6 entrante. Este parche expone los indicadores espec\u00edficos del protocolo a la funci\u00f3n `suprimir` espec\u00edfica del protocolo y verifica el argumento `flags` espec\u00edfico del protocolo para RT6_LOOKUP_F_DST_NOREF en lugar del FIB_LOOKUP_NOREF gen\u00e9rico al disminuir el recuento, de esta manera. [1]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L71 [2]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038 c3266e26/net 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:40:06+00:00",
      "cve": "CVE-2021-47546",
      "id": "CVE-2021-47546",
      "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: ipv6: fix memory leak in fib6_rule_suppress",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47546.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T02:37:14Z",
      "cve": "CVE-2021-47546",
      "id": "CVE-2021-47546",
      "initial_release_date": "2024-05-28T15:29:31Z",
      "product_status:known_affected": "363",
      "product_status:known_not_affected": "218",
      "product_status:recommended": "302",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47546",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47546.json",
      "version": "65"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/209d35ee34e25f9668c404350a1c86d914c54ffa\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/cdef485217d30382f3bf6448c54b4401648fe3f1\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.755Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47546\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-17T17:34:31.593424Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T17:34:32.582Z\"}}], \"cna\": {\"title\": \"ipv6: fix memory leak in fib6_rule_suppress\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ca7a03c4175366a92cee0ccc4fec0038c3266e26\", \"lessThan\": \"ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca7a03c4175366a92cee0ccc4fec0038c3266e26\", \"lessThan\": \"209d35ee34e25f9668c404350a1c86d914c54ffa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca7a03c4175366a92cee0ccc4fec0038c3266e26\", \"lessThan\": \"8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca7a03c4175366a92cee0ccc4fec0038c3266e26\", \"lessThan\": \"cdef485217d30382f3bf6448c54b4401648fe3f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d37c966752043733eb847dd897d6e3405084c559\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ecc265624956ea784cb2bd2b31a95bd54c4f5f13\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.2.19\", \"lessThan\": \"5.3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.3.4\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}], \"programFiles\": [\"include/net/fib_rules.h\", \"net/core/fib_rules.c\", \"net/ipv4/fib_rules.c\", \"net/ipv6/fib6_rules.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.164\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"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\": [\"include/net/fib_rules.h\", \"net/core/fib_rules.c\", \"net/ipv4/fib_rules.c\", \"net/ipv6/fib6_rules.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29\"}, {\"url\": \"https://git.kernel.org/stable/c/209d35ee34e25f9668c404350a1c86d914c54ffa\"}, {\"url\": \"https://git.kernel.org/stable/c/8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383\"}, {\"url\": \"https://git.kernel.org/stable/c/cdef485217d30382f3bf6448c54b4401648fe3f1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: fix memory leak in fib6_rule_suppress\\n\\nThe kernel leaks memory when a `fib` rule is present in IPv6 nftables\\nfirewall rules and a suppress_prefix rule is present in the IPv6 routing\\nrules (used by certain tools such as wg-quick). In such scenarios, every\\nincoming packet will leak an allocation in `ip6_dst_cache` slab cache.\\n\\nAfter some hours of `bpftrace`-ing and source code reading, I tracked\\ndown the issue to ca7a03c41753 (\\\"ipv6: do not free rt if\\nFIB_LOOKUP_NOREF is set on suppress rule\\\").\\n\\nThe problem with that change is that the generic `args-\u003eflags` always have\\n`FIB_LOOKUP_NOREF` set[1][2] but the IPv6-specific flag\\n`RT6_LOOKUP_F_DST_NOREF` might not be, leading to `fib6_rule_suppress` not\\ndecreasing the refcount when needed.\\n\\nHow to reproduce:\\n - Add the following nftables rule to a prerouting chain:\\n     meta nfproto ipv6 fib saddr . mark . iif oif missing drop\\n   This can be done with:\\n     sudo nft create table inet test\\n     sudo nft create chain inet test test_chain \u0027{ type filter hook prerouting priority filter + 10; policy accept; }\u0027\\n     sudo nft add rule inet test test_chain meta nfproto ipv6 fib saddr . mark . iif oif missing drop\\n - Run:\\n     sudo ip -6 rule add table main suppress_prefixlength 0\\n - Watch `sudo slabtop -o | grep ip6_dst_cache` to see memory usage increase\\n   with every incoming ipv6 packet.\\n\\nThis patch exposes the protocol-specific flags to the protocol\\nspecific `suppress` function, and check the protocol-specific `flags`\\nargument for RT6_LOOKUP_F_DST_NOREF instead of the generic\\nFIB_LOOKUP_NOREF when decreasing the refcount, like this.\\n\\n[1]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L71\\n[2]: https://github.com/torvalds/linux/blob/ca7a03c4175366a92cee0ccc4fec0038c3266e26/net/ipv6/fib6_rules.c#L99\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.164\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.84\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.7\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.2.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.3.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:20:10.607Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47546\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:20:10.607Z\", \"dateReserved\": \"2024-05-24T15:02:54.829Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:09:51.286Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.