# CVE-2022-49420: linux: In the Linux kernel, the following vulnerability has been resolved:  net: annotate races around sk->sk_bound_dev_if...

CVE-2022-49420 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49420, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49420
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: annotate races around sk->sk_bound_dev_if  UDP sendmsg() is lockless, and reads sk->sk_bound_dev_if while this field can be changed by another thread.  Adds minimal annotations to avoid KCSAN splats for UDP. Following patches will add more annotations to potential lockless readers.  BUG: KCSAN: data-race in __ip6_datagram_connect / udpv6_sendmsg  write to 0xffff888136d47a94 of 4 bytes by task 7681 on cpu 0:  __ip6_datagram_connect+0x6e2/0x930 net/ipv6/datagram.c:221  ip6_datagram_connect+0x2a/0x40 net/ipv6/datagram.c:272  inet_dgram_connect+0x107/0x190 net/ipv4/af_inet.c:576  __sys_connect_file net/socket.c:1900 [inline]  __sys_connect+0x197/0x1b0 net/socket.c:1917  __do_sys_connect net/socket.c:1927 [inline]  __se_sys_connect net/socket.c:1924 [inline]  __x64_sys_connect+0x3d/0x50 net/socket.c:1924  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe+0x44/0xae  read to 0xffff888136d47a94 of 4 bytes by task 7670 on cpu 1:  udpv6_sendmsg+0xc60/0x16e0 net/ipv6/udp.c:1436  inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:652  sock_sendmsg_nosec net/socket.c:705 [inline]  sock_sendmsg net/socket.c:725 [inline]  ____sys_sendmsg+0x39a/0x510 net/socket.c:2413  ___sys_sendmsg net/socket.c:2467 [inline]  __sys_sendmmsg+0x267/0x4c0 net/socket.c:2553  __do_sys_sendmmsg net/socket.c:2582 [inline]  __se_sys_sendmmsg net/socket.c:2579 [inline]  __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2579  do_syscall_x64 arch/x86/entry/common.c:50 [inline]  do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80  entry_SYSCALL_64_after_hwframe+0x44/0xae  value changed: 0x00000000 -> 0xffffff9b  Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7670 Comm: syz-executor.3 Tainted: G        W         5.18.0-rc1-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011  I chose to not add Fixes: tag because race has minor consequences and stable teams busy enough.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.5-1 | [DEBIAN-CVE-2022-49420](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49420.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.5-1 | [DEBIAN-CVE-2022-49420](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49420.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.5-1 | [DEBIAN-CVE-2022-49420](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49420.md) | Feb 26, 2025 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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