{"id":"CVE-2026-72447","summary":"sctp: hold socket lock when dumping endpoints in sctp_diag","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: hold socket lock when dumping endpoints in sctp_diag\n\nSCTP_DIAG endpoint dumping was traversing endpoint address lists without\nholding lock_sock(), while those lists could change concurrently via\nsocket operations (e.g., bindx changes). This creates a race where\nnla_reserve() counts addresses under RCU protection, but the subsequent\ncopy may see fewer entries, potentially leaking uninitialized memory to\nuserspace.\n\nFix this by:\n\n- Taking a reference on each endpoint during hash traversal\n- Moving socket operations (lock_sock()) outside read_lock_bh()\n- Serializing address list access during dump\n- Reworking sctp_for_each_endpoint() to support restart-based traversal\n  with (net, pos) tracking\n\nAlso:\n\n- Add WARN_ON_ONCE() for inconsistent address counts\n- Fix idiag_states filtering for LISTEN vs association cases\n- Skip dumping endpoints being freed (ep-\u003ebase.dead)\n- Move dump position tracking into iterator, removing cb-\u003eargs[4] and\n  its comment for sctp_ep_dump().,\n- Update the comment for cb-\u003eargs[4] and remove the comment for unused\n  cb-\u003eargs[5] for sctp_sock_dump().\n\nNote: traversal is restart-based and may re-scan buckets multiple times,\nbut this is acceptable due to small bucket sizes and required to support\nsleeping-safe callbacks.\n\nThis issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero\nDay Initiative.","modified":"2026-08-18T03:31:06.601248051Z","published":"2026-08-15T05:56:57.089Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72447.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/207bb4ce8fe7de961ae7bb33569ad2cd61f44954"},{"type":"WEB","url":"https://git.kernel.org/stable/c/722576aba0a6d9423714550b1c03239b0f0def77"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/abe7f8828e6ac8be858870c2bf836258844f97d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec3c2d59a192e17e1014ba71afc368ba162ecac3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f09a245f33e567b604efa1960b7a2d25dd9c8713"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f98c294a9369b6fe89e652c06357ee594be4dfa2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72447.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72447"},{"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":"8f840e47f190cbe61a96945c13e9551048d42cef"},{"fixed":"f98c294a9369b6fe89e652c06357ee594be4dfa2"},{"fixed":"8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a"},{"fixed":"ec3c2d59a192e17e1014ba71afc368ba162ecac3"},{"fixed":"722576aba0a6d9423714550b1c03239b0f0def77"},{"fixed":"abe7f8828e6ac8be858870c2bf836258844f97d5"},{"fixed":"207bb4ce8fe7de961ae7bb33569ad2cd61f44954"},{"fixed":"f09a245f33e567b604efa1960b7a2d25dd9c8713"},{"fixed":"7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72447.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.7.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72447.json"}}],"schema_version":"1.9.0"}