{"id":"CVE-2025-21639","summary":"sctp: sysctl: rto_min/max: avoid using current-\u003ensproxy","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: rto_min/max: 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.rto_min/max' is used.","modified":"2026-04-16T04:39:03.781523771Z","published":"2025-01-19T10:17:56.828Z","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":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21639.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f78f09466744589e420935e646ae78212a38290"},{"type":"WEB","url":"https://git.kernel.org/stable/c/246428bfb9e7db15c5cd08e1d0eca41b65af2b06"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9fc17b76fc70763780aa78b38fcf4742384044a5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c87f1f6ade56c711f8736901e330685b453e420e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f"},{"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-2025-21639.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21639"},{"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":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5"},{"fixed":"c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9"},{"fixed":"246428bfb9e7db15c5cd08e1d0eca41b65af2b06"},{"fixed":"0f78f09466744589e420935e646ae78212a38290"},{"fixed":"4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482"},{"fixed":"dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f"},{"fixed":"c87f1f6ade56c711f8736901e330685b453e420e"},{"fixed":"9fc17b76fc70763780aa78b38fcf4742384044a5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21639.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"}]}