cbcvebase.
CVE-2026-46227
published 2026-05-28

CVE-2026-46227: 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…

PriorityP340high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.10%
1.2th percentile
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_entr

Affected

20 ranges
VendorProductVersion rangeFixed in
linuxlinux——
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < f3a3f0b406b4b7eb3cea35a23fa2bf170848b104f3a3f0b406b4b7eb3cea35a23fa2bf170848b104
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < 0dbc8cde64280fc37cdd678cced34eaf96cfb1970dbc8cde64280fc37cdd678cced34eaf96cfb197
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < 0c7b55974f97b78d1109025eadf084e74cbf330f0c7b55974f97b78d1109025eadf084e74cbf330f
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < 1bfb06ecb00f7fdf35dba8e8f2877346cbe5e0781bfb06ecb00f7fdf35dba8e8f2877346cbe5e078
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < 6187a172d6ed57d6b2c327836e4407c6456e639d6187a172d6ed57d6b2c327836e4407c6456e639d
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < c9dadb31f36045a8cb65df4bd75e7237ef21a4b5c9dadb31f36045a8cb65df4bd75e7237ef21a4b5
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < bf0f40d8107e2ce827521968dc6926f3e13728aebf0f40d8107e2ce827521968dc6926f3e13728ae
linuxlinux>= 4910280503f3af2857d5aa77e35b22d93a8960a8 < abb5f36771cc4c05899b34000829a787572a8817abb5f36771cc4c05899b34000829a787572a8817
linuxlinux_kernel——
linuxlinux_kernel——
linuxlinux_kernel——
linuxlinux_kernel——
linuxlinux_kernel>= 4.17 < 5.10.2585.10.258
linuxlinux_kernel>= 5.11 < 5.15.2095.15.209
linuxlinux_kernel>= 5.16 < 6.1.1756.1.175
linuxlinux_kernel>= 6.13 < 6.18.326.18.32
linuxlinux_kernel>= 6.19 < 7.0.97.0.9
linuxlinux_kernel>= 6.2 < 6.6.1406.6.140
linuxlinux_kernel>= 6.7 < 6.12.906.12.90

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat7.0HIGH
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