{"id":"CVE-2025-21640","revision":"4cc6e05960184aac80e197679910e4fe","records":[{"revision":"4cc6e05960184aac80e197679910e4fe","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21640","aliases":[],"title":"sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: cookie_hmac_alg: 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, as this is the only\nmember needed from the 'net' structure, but that would increase the size\nof this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is\nused.","state":0,"publishedAt":"2025-01-19T10:17:57.593+00:00","modifiedAt":"2026-10-15T21:51:51.964+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\": \"3c68198e75111a905ac2412be12bf7b29099729b\",\n                            \"lessThan\": \"5599b212d2f4466e1832a94e9932684aaa364587\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3c68198e75111a905ac2412be12bf7b29099729b\",\n                            \"lessThan\": \"03ca51faba2b017bf6c90e139434c4117d0afcdc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3c68198e75111a905ac2412be12bf7b29099729b\",\n                            \"lessThan\": \"86ddf8118123cb58a0fb8724cad6979c4069065b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3c68198e75111a905ac2412be12bf7b29099729b\",\n                            \"lessThan\": \"3cd0659deb9c03535fd61839e91d4d4d3e51ac71\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3c68198e75111a905ac2412be12bf7b29099729b\",\n                            \"lessThan\": \"ad673e514b2793b8d5902f6ba6ab7e890dea23d5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3c68198e75111a905ac2412be12bf7b29099729b\",\n                            \"lessThan\": \"f0bb3935470684306e4e04793a20ac4c4b08de0b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3c68198e75111a905ac2412be12bf7b29099729b\",\n                            \"lessThan\": \"ea62dd1383913b5999f3d16ae99d411f41b528d4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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\": \"3.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.8\",\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/5599b212d2f4466e1832a94e9932684aaa364587","https://git.kernel.org/stable/c/03ca51faba2b017bf6c90e139434c4117d0afcdc","https://git.kernel.org/stable/c/86ddf8118123cb58a0fb8724cad6979c4069065b","https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71","https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5","https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b","https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21640","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21640","identifiers":["CVE-2025-21640"]},"retained":false,"historicalAffected":[]}],"coverage":[]}