{"id":"CVE-2021-47297","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix uninit-value in caif_seqpkt_sendmsg\n\nWhen nr_segs equal to zero in iovec_from_user, the object\nmsg-\u003emsg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg\nwhich is defined in ___sys_sendmsg. So we cann't just judge\nmsg-\u003emsg_iter.iov-\u003ebase directlly. We can use nr_segs to judge\nmsg in caif_seqpkt_sendmsg whether has data buffers.\n\n=====================================================\nBUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x1c9/0x220 lib/dump_stack.c:118\n kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118\n __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215\n caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542\n sock_sendmsg_nosec net/socket.c:652 [inline]\n sock_sendmsg net/socket.c:672 [inline]\n ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343\n ___sys_sendmsg net/socket.c:2397 [inline]\n __sys_sendmmsg+0x808/0xc90 net/socket.c:2480\n __compat_sys_sendmmsg net/compat.c:656 [inline]","modified":"2026-03-14T14:52:52.621224Z","published":"2024-05-21T15:15:17.553Z","related":["SUSE-SU-2024:2360-1","SUSE-SU-2024:2381-1","SUSE-SU-2024:2561-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/d4c7797ab1517515f0d08b3bc1c6b48883889c54"},{"type":"FIX","url":"https://git.kernel.org/stable/c/d9d646acad2c3590e189bb5d5c86ab8bd8a2dfc3"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ffe31dd70b70a40cd6b21b78c1713a23e021843a"},{"type":"FIX","url":"https://git.kernel.org/stable/c/1582a02fecffcee306663035a295e28e1c4aaaff"},{"type":"FIX","url":"https://git.kernel.org/stable/c/452c3ed7bf63721b07bc2238ed1261bb26027e85"},{"type":"FIX","url":"https://git.kernel.org/stable/c/5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db"},{"type":"FIX","url":"https://git.kernel.org/stable/c/9413c0abb57f70a953b1116318d6aa478013c35d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/991e634360f2622a683b48dfe44fe6d9cb765a09"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47297.json","unresolved_ranges":[{"events":[{"introduced":"2.6.35"},{"fixed":"4.4.277"}]},{"events":[{"introduced":"4.5"},{"fixed":"4.9.277"}]},{"events":[{"introduced":"4.10"},{"fixed":"4.14.241"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.199"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.136"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.54"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.13.6"}]},{"events":[{"introduced":"0"},{"last_affected":"5.14-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.14-rc2"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}