{"id":"CVE-2025-21638","revision":"dae1a656233d44df87af880b08264cdc","records":[{"revision":"dae1a656233d44df87af880b08264cdc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21638","aliases":[],"title":"sctp: sysctl: auth_enable: avoid using current->nsproxy","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: auth_enable: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n  from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n  (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n  syzbot [1] using acct(2).\n\nThe 'net' structure can be obtained from the table->data using\ncontainer_of().\n\nNote that table->data could also be used directly, but that would\nincrease the size of this fix, while 'sctp.ctl_sock' still needs to be\nretrieved from 'net' structure.","state":0,"publishedAt":"2025-01-19T10:17:56.084+00:00","modifiedAt":"2026-10-15T21:51:51.834+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sctp/sysctl.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b14878ccb7fac0242db82720b784ab62c467c0dc\",\n                            \"lessThan\": \"cf387cdebfaebae228dfba162f94c567a67610c3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b14878ccb7fac0242db82720b784ab62c467c0dc\",\n                            \"lessThan\": \"dc583e7e5f8515ca489c0df28e4362a70eade382\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b14878ccb7fac0242db82720b784ab62c467c0dc\",\n                            \"lessThan\": \"bd2a2939423566c654545fa3e96a656662a0af9e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b14878ccb7fac0242db82720b784ab62c467c0dc\",\n                            \"lessThan\": \"1b67030d39f2b00f94ac1f0af11ba6657589e4d3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b14878ccb7fac0242db82720b784ab62c467c0dc\",\n                            \"lessThan\": \"7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b14878ccb7fac0242db82720b784ab62c467c0dc\",\n                            \"lessThan\": \"c184bc621e3cef03ac9ba81a50dda2dae6a21d36\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b14878ccb7fac0242db82720b784ab62c467c0dc\",\n                            \"lessThan\": \"15649fd5415eda664ef35780c2013adeb5d9c695\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e5eae4a0511241959498b180fa0df0d4f1b11b9c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"88830f227a1f96e44d82ddfcb0cc81d517ec6dd8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3938b0336a93fa5faa242dc9e5823ac69df9e066\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3.10.41\",\n                            \"lessThan\": \"3.11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.12.21\",\n                            \"lessThan\": \"3.13\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.14.5\",\n                            \"lessThan\": \"3.15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sctp/sysctl.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.292\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.234\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.177\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.125\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.72\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.10\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.13\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/cf387cdebfaebae228dfba162f94c567a67610c3","https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382","https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e","https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3","https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6","https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36","https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21638","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21638","identifiers":["CVE-2025-21638"]},"retained":false,"historicalAffected":[]}],"coverage":[]}