CVE-2021-47297 (GCVE-0-2021-47297)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2025-05-04 07:08
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix uninit-value in caif_seqpkt_sendmsg When nr_segs equal to zero in iovec_from_user, the object msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg which is defined in ___sys_sendmsg. So we cann't just judge msg->msg_iter.iov->base directlly. We can use nr_segs to judge msg in caif_seqpkt_sendmsg whether has data buffers. ===================================================== BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [inline] __sys_sendmmsg+0x808/0xc90 net/socket.c:2480 __compat_sys_sendmmsg net/compat.c:656 [inline]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/1582a02fecffcee306663035a295e28e1c4aaaff Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/452c3ed7bf63721b07bc2238ed1261bb26027e85 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/9413c0abb57f70a953b1116318d6aa478013c35d Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/991e634360f2622a683b48dfe44fe6d9cb765a09 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d4c7797ab1517515f0d08b3bc1c6b48883889c54 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d9d646acad2c3590e189bb5d5c86ab8bd8a2dfc3 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/ffe31dd70b70a40cd6b21b78c1713a23e021843a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/1582a02fecffcee306663035a295e28e1c4aaaff Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/452c3ed7bf63721b07bc2238ed1261bb26027e85 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/9413c0abb57f70a953b1116318d6aa478013c35d Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/991e634360f2622a683b48dfe44fe6d9cb765a09 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d4c7797ab1517515f0d08b3bc1c6b48883889c54 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d9d646acad2c3590e189bb5d5c86ab8bd8a2dfc3 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/ffe31dd70b70a40cd6b21b78c1713a23e021843a Patch
Impacted products
Vendor Product Version
Linux Linux Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
Version: bece7b2398d073d11b2e352405a3ecd3a1e39c60
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    "dateUpdated": "2025-05-04T07:08:12.115Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47297\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:17.553\",\"lastModified\":\"2025-04-02T14:42:58.820\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027t 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]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: corrige el valor uninit en caif_seqpkt_sendmsg. Cuando nr_segs es igual a cero en iovec_from_user, el objeto msg-\u0026gt;msg_iter.iov es la memoria de pila uninit en caif_seqpkt_sendmsg que est\u00e1 definida en ___sys_sendmsg. Entonces no podemos simplemente juzgar msg-\u0026gt;msg_iter.iov-\u0026gt;base directamente. Podemos usar nr_segs para juzgar si msg en caif_seqpkt_sendmsg tiene buffers de datos. ==================================================== === BUG: KMSAN: valor uninit en caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:77 [en l\u00ednea] dump_stack+0x1c9/0x220 lib/dump_stack.c: 118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 sock_sendmsg_nosec net/so cket.c: 652 [en l\u00ednea] sock_sendmsg net/socket.c:672 [en l\u00ednea] ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [en l\u00ednea] __sys_sendmmsg+0x808/0xc90 80 __compat_sys_sendmmsg net/compat.c:656 [en 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object\\nmsg-\u003emsg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg\\nwhich is defined in ___sys_sendmsg. So we cann\u0027t 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]\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:03:12.512Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47297\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-06T19:35:49.436Z\", \"dateReserved\": \"2024-05-21T13:27:52.132Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:19.982Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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