CVE-2021-47010 (GCVE-0-2021-47010)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-05-11 13:46
VLAI
Title
net: Only allow init netns to set default tcp cong to a restricted algo
Summary
In the Linux kernel, the following vulnerability has been resolved: net: Only allow init netns to set default tcp cong to a restricted algo tcp_set_default_congestion_control() is netns-safe in that it writes to &net->ipv4.tcp_congestion_control, but it also sets ca->flags |= TCP_CONG_NON_RESTRICTED which is not namespaced. This has the unintended side-effect of changing the global net.ipv4.tcp_allowed_congestion_control sysctl, despite the fact that it is read-only: 97684f0970f6 ("net: Make tcp_allowed_congestion_control readonly in non-init netns") Resolve this netns "leak" by only allowing the init netns to set the default algorithm to one that is restricted. This restriction could be removed if tcp_allowed_congestion_control were namespace-ified in the future. This bug was uncovered with https://github.com/JonathonReinhart/linux-netns-sysctl-verify
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6670e152447732ba90626f36dfc015a13fbf150e , < 992de06308d9a9584d59b96d294ac676f924e437 (git)
Affected: 6670e152447732ba90626f36dfc015a13fbf150e , < 9884f745108f7d25b189bbcd6754e284fb29ab68 (git)
Affected: 6670e152447732ba90626f36dfc015a13fbf150e , < 6c1ea8bee75df8fe2184a50fcd0f70bf82986f42 (git)
Affected: 6670e152447732ba90626f36dfc015a13fbf150e , < efe1532a6e1a8e3c343d04fff510f0ed80328f9c (git)
Affected: 6670e152447732ba90626f36dfc015a13fbf150e , < e7d7bedd507bb732e600403b7a96f9fe48d0ca31 (git)
Affected: 6670e152447732ba90626f36dfc015a13fbf150e , < 8d432592f30fcc34ef5a10aac4887b4897884493 (git)
Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.119 , ≤ 5.4.* (semver)
Unaffected: 5.10.37 , ≤ 5.10.* (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
linux linux_kernel Affected: 6670e1524477 , < 992de06308d9 (custom)
Affected: 6670e1524477 , < 9884f745108f (custom)
Affected: 6670e1524477 , < 6c1ea8bee75d (custom)
Affected: 6670e1524477 , < efe1532a6e1a (custom)
Affected: 6670e1524477 , < e7d7bedd507b (custom)
Affected: 6670e1524477 , < 8d432592f30f (custom)
Affected: 4.15
Unaffected: 0 , < 4.15 (custom)
Unaffected: 4.19.191 , ≤ 4.20 (custom)
Unaffected: 5.4.119 , ≤ 5.5 (custom)
Unaffected: 5.10.37 , ≤ 5.11 (custom)
Unaffected: 5.11.21 , ≤ 5.12 (custom)
Unaffected: 5.12.4 , ≤ 5.13 (custom)
Unaffected: 5.13 , ≤ * (custom)
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
 Create a notification for this product.
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This restriction could be\\nremoved if tcp_allowed_congestion_control were namespace-ified in the\\nfuture.\\n\\nThis bug was uncovered with\\nhttps://github.com/JonathonReinhart/linux-netns-sysctl-verify\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: solo permite que init netns establezca la cong tcp predeterminada en un algoritmo restringido tcp_set_default_congestion_control() es seguro para netns porque escribe en \u0026amp;net-\u0026gt;ipv4.tcp_congestion_control, pero tambi\u00e9n establece ca-\u0026gt;flags |= TCP_CONG_NON_RESTRICTED que no tiene espacio de nombres. Esto tiene el efecto secundario no deseado de cambiar el sistema global net.ipv4.tcp_allowed_congestion_control, a pesar de que es de solo lectura: 97684f0970f6 (\\\"net: Make tcp_allowed_congestion_control readonly in non-init netns\\\") Resuelva esta \\\"fuga\\\" de netns solo permite que las redes de inicio establezcan el algoritmo predeterminado en uno restringido. Esta restricci\u00f3n podr\u00eda eliminarse si tcp_allowed_congestion_control tuviera un espacio de nombres en el futuro. 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https://github.com/JonathonReinhart/linux-netns-sysctl-verify\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/tcp_cong.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6670e152447732ba90626f36dfc015a13fbf150e\",\"lessThan\":\"992de06308d9a9584d59b96d294ac676f924e437\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6670e152447732ba90626f36dfc015a13fbf150e\",\"lessThan\":\"9884f745108f7d25b189bbcd6754e284fb29ab68\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6670e152447732ba90626f36dfc015a13fbf150e\",\"lessThan\":\"6c1ea8bee75df8fe2184a50fcd0f70bf82986f42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6670e152447732ba90626f36dfc015a13fbf150e\",\"lessThan\":\"efe1532a6e1a8e3c343d04fff510f0ed80328f9c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6670e152447732ba90626f36dfc015a13fbf150e\",\"lessThan\":\"e7d7bedd507bb732e600403b7a96f9fe48d0ca31\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6670e152447732ba90626f36dfc015a13fbf150e\",\"lessThan\":\"8d432592f30fcc34ef5a10aac4887b4897884493\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/tcp_cong.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.191\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.119\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.37\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.11.21\",\"lessThanOrEqual\":\"5.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.12.4\",\"lessThanOrEqual\":\"5.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"affectedData\":[{\"vendor\":\"linux\",\"product\":\"linux_kernel\",\"defaultStatus\":\"unknown\",\"cpes\":[\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"6670e1524477\",\"lessThan\":\"992de06308d9\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6670e1524477\",\"lessThan\":\"9884f745108f\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6670e1524477\",\"lessThan\":\"6c1ea8bee75d\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6670e1524477\",\"lessThan\":\"efe1532a6e1a\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6670e1524477\",\"lessThan\":\"e7d7bedd507b\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6670e1524477\",\"lessThan\":\"8d432592f30f\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"versionType\":\"custom\",\"status\":\"unaffected\"},{\"version\":\"4.19.191\",\"lessThanOrEqual\":\"4.20\",\"versionType\":\"custom\",\"status\":\"unaffected\"},{\"version\":\"5.4.119\",\"lessThanOrEqual\":\"5.5\",\"versionType\":\"custom\",\"status\":\"unaffected\"},{\"version\":\"5.10.37\",\"lessThanOrEqual\":\"5.11\",\"versionType\":\"custom\",\"status\":\"unaffected\"},{\"version\":\"5.11.21\",\"lessThanOrEqual\":\"5.12\",\"versionType\":\"custom\",\"status\":\"unaffected\"},{\"version\":\"5.12.4\",\"lessThanOrEqual\":\"5.13\",\"versionType\":\"custom\",\"status\":\"unaffected\"},{\"version\":\"5.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"custom\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-07-25T15:24:31.511356Z\",\"id\":\"CVE-2021-47010\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:43:13+00:00",
      "cve": "CVE-2021-47010",
      "id": "CVE-2021-47010",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: Only allow init netns to set default tcp cong to a restricted algo",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47010.json",
      "version": "3"
    },
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      "cveMetadata": "{\"cveId\": \"CVE-2021-47010\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:02:15.538Z\", \"dateReserved\": \"2024-02-27T18:42:55.953Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-28T08:13:29.051Z\", \"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.