{"cve":"CVE-2021-47297","nvd":{"published":"2024-05-21T15:15:17.553","modified":"2026-06-17T04:17:07.950","status":"Analyzed","description":"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->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg\nwhich is defined in ___sys_sendmsg. So we cann't just judge\nmsg->msg_iter.iov->base 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]","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-908"],"references":["https://git.kernel.org/stable/c/1582a02fecffcee306663035a295e28e1c4aaaff","https://git.kernel.org/stable/c/452c3ed7bf63721b07bc2238ed1261bb26027e85","https://git.kernel.org/stable/c/5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db","https://git.kernel.org/stable/c/9413c0abb57f70a953b1116318d6aa478013c35d","https://git.kernel.org/stable/c/991e634360f2622a683b48dfe44fe6d9cb765a09"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2021-47297","score":0.00226,"percentile":0.13363,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}