CVE-2021-47297 (GCVE-0-2021-47297)
Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-05-04 07:08
VLAI?
Title
net: fix uninit-value in caif_seqpkt_sendmsg
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]
Severity ?
5.5 (Medium)
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < d9d646acad2c3590e189bb5d5c86ab8bd8a2dfc3
(git)
Affected: bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < 5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db (git) Affected: bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < ffe31dd70b70a40cd6b21b78c1713a23e021843a (git) Affected: bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < 452c3ed7bf63721b07bc2238ed1261bb26027e85 (git) Affected: bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < 9413c0abb57f70a953b1116318d6aa478013c35d (git) Affected: bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < 1582a02fecffcee306663035a295e28e1c4aaaff (git) Affected: bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < d4c7797ab1517515f0d08b3bc1c6b48883889c54 (git) Affected: bece7b2398d073d11b2e352405a3ecd3a1e39c60 , < 991e634360f2622a683b48dfe44fe6d9cb765a09 (git) |
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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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Sightings
| Author | Source | Type | Date |
|---|
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.
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