CVE-2021-47010

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47010", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-27T18:42:55.953Z", "datePublished": "2024-02-28T08:13:29.051Z", "dateUpdated": "2026-05-11T13:46:12.794Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:46:12.794Z"}, "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 &net->ipv4.tcp_congestion_control, but it also sets\nca->flags |= 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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_cong.c"], "versions": [{"version": "6670e152447732ba90626f36dfc015a13fbf150e", "lessThan": "992de06308d9a9584d59b96d294ac676f924e437", "status": "affected", "versionType": "git"}, {"version": "6670e152447732ba90626f36dfc015a13fbf150e", "lessThan": "9884f745108f7d25b189bbcd6754e284fb29ab68", "status": "affected", "versionType": "git"}, {"version": "6670e152447732ba90626f36dfc015a13fbf150e", "lessThan": "6c1ea8bee75df8fe2184a50fcd0f70bf82986f42", "status": "affected", "versionType": "git"}, {"version": "6670e152447732ba90626f36dfc015a13fbf150e", "lessThan": "efe1532a6e1a8e3c343d04fff510f0ed80328f9c", "status": "affected", "versionType": "git"}, {"version": "6670e152447732ba90626f36dfc015a13fbf150e", "lessThan": "e7d7bedd507bb732e600403b7a96f9fe48d0ca31", "status": "affected", "versionType": "git"}, {"version": "6670e152447732ba90626f36dfc015a13fbf150e", "lessThan": "8d432592f30fcc34ef5a10aac4887b4897884493", "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/ipv4/tcp_cong.c"], "versions": [{"version": "4.15", "status": "affected"}, {"version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.191", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.119", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.37", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.11.21", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.4", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "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": "4.15", "versionEndExcluding": "4.19.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.4.119"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.10.37"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.11.21"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.12.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "5.13"}]}]}], "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"}], "title": "net: Only allow init netns to set default tcp cong to a restricted algo", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.534Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493", "tags": ["x_transferred"]}]}, {"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-400", "lang": "en", "description": "CWE-400 Uncontrolled Resource Consumption"}]}], "affected": [{"vendor": "linux", "product": "linux_kernel", "cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "versions": [{"version": "6670e1524477", "status": "affected", "lessThan": "992de06308d9", "versionType": "custom"}, {"version": "6670e1524477", "status": "affected", "lessThan": "9884f745108f", "versionType": "custom"}, {"version": "6670e1524477", "status": "affected", "lessThan": "6c1ea8bee75d", "versionType": "custom"}, {"version": "6670e1524477", "status": "affected", "lessThan": "efe1532a6e1a", "versionType": "custom"}, {"version": "6670e1524477", "status": "affected", "lessThan": "e7d7bedd507b", "versionType": "custom"}, {"version": "6670e1524477", "status": "affected", "lessThan": "8d432592f30f", "versionType": "custom"}, {"version": "4.15", "status": "affected"}, {"version": "0", "status": "unaffected", "lessThan": "4.15", "versionType": "custom"}, {"version": "4.19.191", "status": "unaffected", "lessThanOrEqual": "4.20", "versionType": "custom"}, {"version": "5.4.119", "status": "unaffected", "lessThanOrEqual": "5.5", "versionType": "custom"}, {"version": "5.10.37", "status": "unaffected", "lessThanOrEqual": "5.11", "versionType": "custom"}, {"version": "5.11.21", "status": "unaffected", "lessThanOrEqual": "5.12", "versionType": "custom"}, {"version": "5.12.4", "status": "unaffected", "lessThanOrEqual": "5.13", "versionType": "custom"}, {"version": "5.13", "status": "unaffected", "lessThanOrEqual": "*", "versionType": "custom"}]}], "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": {"timestamp": "2024-07-25T15:24:31.511356Z", "id": "CVE-2021-47010", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-08-07T15:25:44.662Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.534Z"}}, {"title": "CISA ADP Vulnrichment", "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 &net->ipv4.tcp_congestion_control, but it also sets\nca->flags |= 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"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/tcp_cong.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "992de06308d9a9584d59b96d294ac676f924e437", "status": "affected", "version": "6670e152447732ba90626f36dfc015a13fbf150e", "versionType": "git"}, {"lessThan": "9884f745108f7d25b189bbcd6754e284fb29ab68", "status": "affected", "version": "6670e152447732ba90626f36dfc015a13fbf150e", "versionType": "git"}, {"lessThan": "6c1ea8bee75df8fe2184a50fcd0f70bf82986f42", "status": "affected", "version": "6670e152447732ba90626f36dfc015a13fbf150e", "versionType": "git"}, {"lessThan": "efe1532a6e1a8e3c343d04fff510f0ed80328f9c", "status": "affected", "version": "6670e152447732ba90626f36dfc015a13fbf150e", "versionType": "git"}, {"lessThan": "e7d7bedd507bb732e600403b7a96f9fe48d0ca31", "status": "affected", "version": "6670e152447732ba90626f36dfc015a13fbf150e", "versionType": "git"}, {"lessThan": "8d432592f30fcc34ef5a10aac4887b4897884493", "status": "affected", "version": "6670e152447732ba90626f36dfc015a13fbf150e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/tcp_cong.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.15"}, {"lessThan": "4.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.191", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.119", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.37", "versionType": "semver"}, {"lessThanOrEqual": "5.11.*", "status": "unaffected", "version": "5.11.21", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"cpes": ["cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "linux_kernel", "vendor": "linux", "versions": [{"lessThan": "992de06308d9", "status": "affected", "version": "6670e1524477", "versionType": "custom"}, {"lessThan": "9884f745108f", "status": "affected", "version": "6670e1524477", "versionType": "custom"}, {"lessThan": "6c1ea8bee75d", "status": "affected", "version": "6670e1524477", "versionType": "custom"}, {"lessThan": "efe1532a6e1a", "status": "affected", "version": "6670e1524477", "versionType": "custom"}, {"lessThan": "e7d7bedd507b", "status": "affected", "version": "6670e1524477", "versionType": "custom"}, {"lessThan": "8d432592f30f", "status": "affected", "version": "6670e1524477", "versionType": "custom"}, {"status": "affected", "version": "4.15"}, {"lessThan": "4.15", "status": "unaffected", "version": "0", "versionType": "custom"}, {"lessThanOrEqual": "4.20", "status": "unaffected", "version": "4.19.191", "versionType": "custom"}, {"lessThanOrEqual": "5.5", "status": "unaffected", "version": "5.4.119", "versionType": "custom"}, {"lessThanOrEqual": "5.11", "status": "unaffected", "version": "5.10.37", "versionType": "custom"}, {"lessThanOrEqual": "5.12", "status": "unaffected", "version": "5.11.21", "versionType": "custom"}, {"lessThanOrEqual": "5.13", "status": "unaffected", "version": "5.12.4", "versionType": "custom"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "custom"}]}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5B6E6817-19A8-4C0A-8807-71DA48CF9191", "versionEndExcluding": "4.19.191", "versionStartIncluding": "4.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E07BA880-1043-4674-AC45-266B3B4A44C7", "versionEndExcluding": "5.4.119", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7A4CF5D6-ACBA-4980-ABFD-3D7A53B5BB4E", "versionEndExcluding": "5.10.37", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8CBB94EC-EC33-4464-99C5-03E5542715F0", "versionEndExcluding": "5.11.21", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838", "versionEndExcluding": "5.12.4", "versionStartIncluding": "5.12", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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 &net->ipv4.tcp_congestion_control, but it also sets\nca->flags |= 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"}, {"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 &net->ipv4.tcp_congestion_control, pero tambi\u00e9n establece ca->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. Este error se descubri\u00f3 con https://github.com/JonathonReinhart/linux-netns-sysctl-verify"}], "id": "CVE-2021-47010", "lastModified": "2026-06-17T04:16:10.390", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47010", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-07-25T15:24:31.511356Z", "version": "2.0.3"}}]}, "published": "2024-02-28T09:15:38.657", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c1ea8bee75df8fe2184a50fcd0f70bf82986f42"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d432592f30fcc34ef5a10aac4887b4897884493"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9884f745108f7d25b189bbcd6754e284fb29ab68"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/992de06308d9a9584d59b96d294ac676f924e437"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7d7bedd507bb732e600403b7a96f9fe48d0ca31"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/efe1532a6e1a8e3c343d04fff510f0ed80328f9c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: net: Only allow init netns to set default tcp cong to a restricted algo", "id": "2266849", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266849"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: Only allow init netns to set default tcp cong to a restricted algo\ntcp_set_default_congestion_control() is netns-safe in that it writes\nto &net->ipv4.tcp_congestion_control, but it also sets\nca->flags |= 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\")\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.\nThis bug was uncovered with\nhttps://github.com/JonathonReinhart/linux-netns-sysctl-verify"], "name": "CVE-2021-47010", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "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": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47010\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47010\nhttps://lore.kernel.org/linux-cve-announce/2024022830-CVE-2021-47010-6853@gregkh/T/#u"], "threat_severity": "Low"}

{}