CVE-2026-46227 (GCVE-0-2026-46227)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:40 – Updated: 2026-06-14 18:04
VLAI
Title
sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL The SCTP_SENDALL path in sctp_sendmsg() iterates ep->asocs with list_for_each_entry_safe(), which caches the next entry in @tmp before the loop body runs. The body calls sctp_sendmsg_to_asoc(), which may drop the socket lock inside sctp_wait_for_sndbuf(). While the lock is dropped, another thread can SCTP_SOCKOPT_PEELOFF the association cached in @tmp, migrating it to a new endpoint via sctp_sock_migrate() (list_del_init() + list_add_tail() to newep->asocs), and optionally close the new socket which frees the association via kfree_rcu(). The cached @tmp can also be freed by a network ABORT for that association, processed in softirq while the lock is dropped. sctp_wait_for_sndbuf() revalidates @asoc (the current entry) on re-lock via the "sk != asoc->base.sk" and "asoc->base.dead" checks, but nothing revalidates @tmp. After a successful return, the iterator advances to the stale @tmp, yielding either a use-after-free (if the peeled socket was closed) or a list-walk onto the new endpoint's list head (type confusion of &newep->asocs as a struct sctp_association *). Both are reachable from CapEff=0; the type-confusion path gives controlled indirect call via the outqueue.sched->init_sid pointer. Fix by re-deriving @tmp from @asoc after sctp_sendmsg_to_asoc() returns. @asoc is known to still be on ep->asocs at that point: the only callers that list_del an association from ep->asocs are sctp_association_free() (which sets asoc->base.dead) and sctp_assoc_migrate() (which changes asoc->base.sk), and sctp_wait_for_sndbuf() checks both under the lock before any successful return; a tripped check propagates as err < 0 and the loop bails before the re-derive. The SCTP_ABORT path in sctp_sendmsg_check_sflags() returns 0 and the loop hits 'continue' before sctp_sendmsg_to_asoc() is ever called, so the @tmp cached by list_for_each_entry_safe() still covers the lock-held free that ba59fb027307 ("sctp: walk the list of asoc safely") was added for.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < f3a3f0b406b4b7eb3cea35a23fa2bf170848b104 (git)
Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < 0dbc8cde64280fc37cdd678cced34eaf96cfb197 (git)
Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < 0c7b55974f97b78d1109025eadf084e74cbf330f (git)
Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < 1bfb06ecb00f7fdf35dba8e8f2877346cbe5e078 (git)
Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < 6187a172d6ed57d6b2c327836e4407c6456e639d (git)
Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < c9dadb31f36045a8cb65df4bd75e7237ef21a4b5 (git)
Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < bf0f40d8107e2ce827521968dc6926f3e13728ae (git)
Affected: 4910280503f3af2857d5aa77e35b22d93a8960a8 , < abb5f36771cc4c05899b34000829a787572a8817 (git)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.90 , ≤ 6.12.* (semver)
Unaffected: 6.18.32 , ≤ 6.18.* (semver)
Unaffected: 7.0.9 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "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-\u003easocs 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-\u003easocs), 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-\u003ebase.sk\" and \"asoc-\u003ebase.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\u0027s list head (type\nconfusion of \u0026newep-\u003easocs as a struct sctp_association *).\n\nBoth are reachable from CapEff=0; the type-confusion path gives\ncontrolled indirect call via the outqueue.sched-\u003einit_sid pointer.\n\nFix by re-deriving @tmp from @asoc after sctp_sendmsg_to_asoc()\nreturns.  @asoc is known to still be on ep-\u003easocs at that point: the\nonly callers that list_del an association from ep-\u003easocs are\nsctp_association_free() (which sets asoc-\u003ebase.dead) and\nsctp_assoc_migrate() (which changes asoc-\u003ebase.sk), and\nsctp_wait_for_sndbuf() checks both under the lock before any\nsuccessful return; a tripped check propagates as err \u003c 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 \u0027continue\u0027 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."
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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-\u003easocs), 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-\u003ebase.sk\\\" and \\\"asoc-\u003ebase.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\u0027s list head (type\\nconfusion of \u0026newep-\u003easocs as a struct sctp_association *).\\n\\nBoth are reachable from CapEff=0; the type-confusion path gives\\ncontrolled indirect call via the outqueue.sched-\u003einit_sid pointer.\\n\\nFix by re-deriving @tmp from @asoc after sctp_sendmsg_to_asoc()\\nreturns.  @asoc is known to still be on ep-\u003easocs at that point: the\\nonly callers that list_del an association from ep-\u003easocs are\\nsctp_association_free() (which sets asoc-\u003ebase.dead) and\\nsctp_assoc_migrate() (which changes asoc-\u003ebase.sk), and\\nsctp_wait_for_sndbuf() checks both under the lock before any\\nsuccessful return; a tripped check propagates as err \u003c 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 \u0027continue\u0027 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 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  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.