# CVE-2021-47297: linux: In the Linux kernel, the following vulnerability has been resolved:  net: fix uninit-value in caif_seqpkt_sendmsg  Wh...

CVE-2021-47297 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47297, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47297
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

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]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47297](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47297.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47297](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47297.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47297](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47297.md) | May 21, 2024 |

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