{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46227",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46227"
  ],
  "published": "2026-05-28T09:40:54Z",
  "summary": "sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL\n\nThe SCTP_SENDALL path in sctp_sendmsg() iterates ep->asocs with\nlist_for_each_entry_safe(), which caches the next entry in @tmp before\nthe loop body runs.  The body calls sctp_sendmsg_to_asoc(), which may\ndrop the socket lock inside sctp_wait_for_sndbuf().\n\nWhile the lock is dropped, another thread can SCTP_SOCKOPT_PEELOFF the\nassociation cached in @tmp, migrating it to a new endpoint via\nsctp_sock_migrate() (list_del_init() + list_add_tail() to\nnewep->asocs), and optionally close the new socket which frees the\nassociation via kfree_rcu().  The cached @tmp can also be freed by a\nnetwork ABORT for that association, processed in softirq while the\nlock is dropped.\n\nsctp_wait_for_sndbuf() revalidates @asoc (the current entry) on re-lock\nvia the \"sk != asoc->base.sk\" and \"asoc->base.dead\" checks, but nothing\nrevalidates @tmp.  After a successful return, the iterator advances to\nthe stale @tmp, yielding either a use-after-free (if the peeled socket\nwas closed) or a list-walk onto the new endpoint's list head (type\nconfusion of &newep->asocs as a struct sctp_association *).\n\nBoth are reachable from CapEff=0; the type-confusion path gives\ncontrolled indirect call via the outqueue.sched->init_sid pointer.\n\nFix by re-deriving @tmp from @asoc after sctp_sendmsg_to_asoc()\nreturns.  @asoc is known to still be on ep->asocs at that point: the\nonly callers that list_del an association from ep->asocs are\nsctp_association_free() (which sets asoc->base.dead) and\nsctp_assoc_migrate() (which changes asoc->base.sk), and\nsctp_wait_for_sndbuf() checks both under the lock before any\nsuccessful return; a tripped check propagates as err < 0 and the loop\nbails before the re-derive.\n\nThe SCTP_ABORT path in sctp_sendmsg_check_sflags() returns 0 and the\nloop hits 'continue' before sctp_sendmsg_to_asoc() is ever called, so\nthe @tmp cached by list_for_each_entry_safe() still covers the\nlock-held free that ba59fb027307 (\"sctp: walk the list of asoc\nsafely\") was added for.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46227"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached via the sendmsg() syscall on a local SCTP socket, and the racing operation (SCTP_SOCKOPT_PEELOFF + close) is likewise a local syscall; no remote packet directly reaches the bug, so local access is required.\nAC:L - The attacker controls both sides of the race \u2014 shrinking SO_SNDBUF on its own socket reliably forces sctp_wait_for_sndbuf() to drop the lock and sleep, while a second thread peels off and closes the cached next association; per guidance an attacker-controlled race is Low.\nPR:L - The commit states both the UAF and type-confusion paths are \"reachable from CapEff=0\"; creating SCTP sockets and using sendmsg/PEELOFF requires no privileges, only a basic unprivileged local user.\nUI:N - The attacker performs all sendmsg, peeloff, and close operations itself; no victim action is required.\nS:U - The corruption (UAF / type confusion) stays within the kernel's own security authority and does not cross into a separate domain such as a VM host or IOMMU boundary.\nC:H - The use-after-free gives the attacker control over freed object contents and the type confusion reinterprets a list head as an association, both of which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The type-confusion path yields a controlled indirect call via the outqueue.sched->init_sid function pointer, providing a control-flow hijack / arbitrary-write-grade primitive for privilege escalation.\nA:H - Both the use-after-free and the type-confusion list walk readily cause kernel oops/panic, giving full availability loss."
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}