{"id":"CVE-2022-49420","title":"net: annotate races around sk->sk_bound_dev_if","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: annotate races around sk->sk_bound_dev_if\n\nUDP sendmsg() is lockless, and reads sk->sk_bound_dev_if while\nthis field can be changed by another thread.\n\nAdds minima…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 20b2f61797873a2b18b5ff1a304ad2674fa1e0a5","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4c971d2f3548e4f11b1460ac048f5307e4b39fdb","Linux < 5.18.3","Linux (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:45:26.838615Z"},"published":"2025-02-26","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:49:39.353Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49420","references":[{"url":"https://git.kernel.org/stable/c/20b2f61797873a2b18b5ff1a304ad2674fa1e0a5"},{"url":"https://git.kernel.org/stable/c/4c971d2f3548e4f11b1460ac048f5307e4b39fdb"}],"tags":["cve.org"],"epss":0.00228,"epssPercentile":0.13695,"ingestedAt":"2026-11-05T22:38:31.574Z","slug":"CVE-2022-49420","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: annotate races around sk->sk_bound_dev_if\n\nUDP sendmsg() is lockless, and reads sk->sk_bound_dev_if while\nthis field can be changed by another thread.\n\nAdds minimal annotations to avoid KCSAN splats for UDP.\nFollowing patches will add more annotations to potential lockless readers.\n\nBUG: KCSAN: data-race in __ip6_datagram_connect / udpv6_sendmsg\n\nwrite to 0xffff888136d47a94 of 4 bytes by task 7681 on cpu 0:\n __ip6_datagram_connect+0x6e2/0x930 net/ipv6/datagram.c:221\n ip6_datagram_connect+0x2a/0x40 net/ipv6/datagram.c:272\n inet_dgram_connect+0x107/0x190 net/ipv4/af_inet.c:576\n __sys_connect_file net/socket.c:1900 [inline]\n __sys_connect+0x197/0x1b0 net/socket.c:1917\n __do_sys_connect net/socket.c:1927 [inline]\n __se_sys_connect net/socket.c:1924 [inline]\n __x64_sys_connect+0x3d/0x50 net/socket.c:1924\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nread to 0xffff888136d47a94 of 4 bytes by task 7670 on cpu 1:\n udpv6_sendmsg+0xc60/0x16e0 net/ipv6/udp.c:1436\n inet6_sendmsg+0x5f/0x80 net/ipv6/af_inet6.c:652\n sock_sendmsg_nosec net/socket.c:705 [inline]\n sock_sendmsg net/socket.c:725 [inline]\n ____sys_sendmsg+0x39a/0x510 net/socket.c:2413\n ___sys_sendmsg net/socket.c:2467 [inline]\n __sys_sendmmsg+0x267/0x4c0 net/socket.c:2553\n __do_sys_sendmmsg net/socket.c:2582 [inline]\n __se_sys_sendmmsg net/socket.c:2579 [inline]\n __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2579\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nvalue changed: 0x00000000 -> 0xffffff9b\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 PID: 7670 Comm: syz-executor.3 Tainted: G        W         5.18.0-rc1-syzkaller-dirty #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\n\nI chose to not add Fixes: tag because race has minor consequences\nand stable teams busy enough.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 20b2f61797873a2b18b5ff1a304ad2674fa1e0a5`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4c971d2f3548e4f11b1460ac048f5307e4b39fdb`\n- `Linux < 5.18.3`\n- `Linux (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}