{"id":"CVE-2025-21638","summary":"sctp: sysctl: auth_enable: avoid using current-\u003ensproxy","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: auth_enable: avoid using current-\u003ensproxy\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-\u003ensproxy 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-\u003edata using\ncontainer_of().\n\nNote that table-\u003edata 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.","modified":"2026-04-16T04:30:50.449014810Z","published":"2025-01-19T10:17:56.084Z","related":["SUSE-SU-2025:0784-1","SUSE-SU-2025:0834-1","SUSE-SU-2025:0847-1","SUSE-SU-2025:0856-1","SUSE-SU-2025:0955-1","SUSE-SU-2025:20190-1","SUSE-SU-2025:20192-1","SUSE-SU-2025:20260-1","SUSE-SU-2025:20270-1","USN-7379-2","USN-7380-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21638.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/15649fd5415eda664ef35780c2013adeb5d9c695"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1b67030d39f2b00f94ac1f0af11ba6657589e4d3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bd2a2939423566c654545fa3e96a656662a0af9e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c184bc621e3cef03ac9ba81a50dda2dae6a21d36"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf387cdebfaebae228dfba162f94c567a67610c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc583e7e5f8515ca489c0df28e4362a70eade382"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21638.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21638"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b14878ccb7fac0242db82720b784ab62c467c0dc"},{"fixed":"cf387cdebfaebae228dfba162f94c567a67610c3"},{"fixed":"dc583e7e5f8515ca489c0df28e4362a70eade382"},{"fixed":"bd2a2939423566c654545fa3e96a656662a0af9e"},{"fixed":"1b67030d39f2b00f94ac1f0af11ba6657589e4d3"},{"fixed":"7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6"},{"fixed":"c184bc621e3cef03ac9ba81a50dda2dae6a21d36"},{"fixed":"15649fd5415eda664ef35780c2013adeb5d9c695"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"e5eae4a0511241959498b180fa0df0d4f1b11b9c"},{"last_affected":"88830f227a1f96e44d82ddfcb0cc81d517ec6dd8"},{"last_affected":"3938b0336a93fa5faa242dc9e5823ac69df9e066"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21638.json"}}],"schema_version":"1.7.5"}