CVE-2021-47010 (GCVE-0-2021-47010)
Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2025-05-04 07:02
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)
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) |
|||||||
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\"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47010\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-07-25T15:24:31.511356Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*\"], \"vendor\": \"linux\", \"product\": \"linux_kernel\", \"versions\": [{\"status\": \"affected\", \"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\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.15\", \"versionType\": \"custom\"}, {\"status\": \"unaffected\", \"version\": \"4.19.191\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"5.4.119\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"5.10.37\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.12\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.13\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"*\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-08-07T15:14:36.709Z\"}}], \"cna\": {\"title\": \"net: Only allow init netns to set default tcp cong to a restricted algo\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"programFiles\": [\"net/ipv4/tcp_cong.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.191\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.119\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.37\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/tcp_cong.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437\"}, {\"url\": \"https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68\"}, {\"url\": \"https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42\"}, {\"url\": \"https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c\"}, {\"url\": \"https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31\"}, {\"url\": \"https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: Only allow init netns to set default tcp cong to a restricted algo\\n\\ntcp_set_default_congestion_control() is netns-safe in that it writes\\nto \u0026net-\u003eipv4.tcp_congestion_control, but it also sets\\nca-\u003eflags |= TCP_CONG_NON_RESTRICTED which is not namespaced.\\nThis has the unintended side-effect of changing the global\\nnet.ipv4.tcp_allowed_congestion_control sysctl, despite the fact that it\\nis read-only: 97684f0970f6 (\\\"net: Make tcp_allowed_congestion_control\\nreadonly in non-init netns\\\")\\n\\nResolve this netns \\\"leak\\\" by only allowing the init netns to set the\\ndefault algorithm to one that is restricted. 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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.119\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"4.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:02:15.538Z\"}}}",
"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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Sightings
| Author | Source | Type | Date |
|---|
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.
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