{"id":"CVE-2025-21636","summary":"sctp: sysctl: plpmtud_probe_interval: avoid using current-\u003ensproxy","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: plpmtud_probe_interval: 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, 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-\u003esctp.probe_interval' is\nused.","modified":"2026-04-16T04:32:48.978840513Z","published":"2025-01-19T10:17:54.576Z","related":["SUSE-SU-2025:0784-1","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-2025-21636.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449"},{"type":"WEB","url":"https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/44ee8635922b6eb940faddb961a8347c6857d722"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21636.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21636"},{"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":"d1e462a7a5f359cbb9a0e8fbfafcfb6657034105"},{"fixed":"1dc5da6c4178f3e4b95c631418f72de9f86c0449"},{"fixed":"44ee8635922b6eb940faddb961a8347c6857d722"},{"fixed":"284a221f8fa503628432c7bb5108277c688c6ffa"},{"fixed":"bcf8c60074e81ed2ac2d35130917175a3949c917"},{"fixed":"6259d2484d0ceff42245d1f09cc8cb6ee72d847a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21636.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}