{"id":"CVE-2025-21639","state":"PUBLISHED","title":"sctp: sysctl: rto_min/max: avoid using current->nsproxy","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: rto_min/max: 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.rto_min/max' is used.","publishedAt":"2025-01-19T10:17:56.828Z","updatedAt":"2026-10-15T01:02:42.114Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5","status":"affected","lessThan":"c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9","versionType":"git"},{"version":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5","status":"affected","lessThan":"246428bfb9e7db15c5cd08e1d0eca41b65af2b06","versionType":"git"},{"version":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5","status":"affected","lessThan":"0f78f09466744589e420935e646ae78212a38290","versionType":"git"},{"version":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5","status":"affected","lessThan":"4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482","versionType":"git"},{"version":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5","status":"affected","lessThan":"dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f","versionType":"git"},{"version":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5","status":"affected","lessThan":"c87f1f6ade56c711f8736901e330685b453e420e","versionType":"git"},{"version":"4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5","status":"affected","lessThan":"9fc17b76fc70763780aa78b38fcf4742384044a5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/sysctl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"5.4.290","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.234","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.177","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.125","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.72","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.10","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/sysctl.c"]}],"references":["https://git.kernel.org/stable/c/c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9","https://git.kernel.org/stable/c/246428bfb9e7db15c5cd08e1d0eca41b65af2b06","https://git.kernel.org/stable/c/0f78f09466744589e420935e646ae78212a38290","https://git.kernel.org/stable/c/4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482","https://git.kernel.org/stable/c/dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f","https://git.kernel.org/stable/c/c87f1f6ade56c711f8736901e330685b453e420e","https://git.kernel.org/stable/c/9fc17b76fc70763780aa78b38fcf4742384044a5","https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html","https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","https://cert-portal.siemens.com/productcert/html/ssa-265688.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/21xxx/CVE-2025-21639.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21639","state":"PUBLISHED","datePublished":"2025-01-19T10:17:56.828Z","dateUpdated":"2026-10-15T01:02:42.114Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.727Z"},"containers":{"cna":{"title":"sctp: sysctl: rto_min/max: avoid using current->nsproxy","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: rto_min/max: 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.rto_min/max' is 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