{"id":"CVE-2024-26638","summary":"nbd: always initialize struct msghdr completely","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: always initialize struct msghdr completely\n\nsyzbot complains that msg-\u003emsg_get_inq value can be uninitialized [1]\n\nstruct msghdr got many new fields recently, we should always make\nsure their values is zero by default.\n\n[1]\n BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571\n  tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571\n  inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879\n  sock_recvmsg_nosec net/socket.c:1044 [inline]\n  sock_recvmsg+0x12b/0x1e0 net/socket.c:1066\n  __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538\n  nbd_read_reply drivers/block/nbd.c:732 [inline]\n  recv_work+0x262/0x3100 drivers/block/nbd.c:863\n  process_one_work kernel/workqueue.c:2627 [inline]\n  process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700\n  worker_thread+0xf45/0x1490 kernel/workqueue.c:2781\n  kthread+0x3ed/0x540 kernel/kthread.c:388\n  ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147\n  ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242\n\nLocal variable msg created at:\n  __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513\n  nbd_read_reply drivers/block/nbd.c:732 [inline]\n  recv_work+0x262/0x3100 drivers/block/nbd.c:863\n\nCPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\nWorkqueue: nbd5-recv recv_work","modified":"2026-04-02T10:05:14.494509Z","published":"2024-03-18T10:14:48.970Z","related":["ALSA-2024:7000","SUSE-SU-2024:2135-1","SUSE-SU-2024:2203-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1","USN-6818-2","USN-6819-2"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26638.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1960f2b534da1e6c65fb96f9e98bda773495f406"},{"type":"WEB","url":"https://git.kernel.org/stable/c/78fbb92af27d0982634116c7a31065f24d092826"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0028f333420a65a53a63978522db680b37379dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d9c54763e5cdbbd3f81868597fe8aca3c96e6387"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26638.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26638"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f94fd25cb0aaf77fd7453f31c5d394a1a68ecf60"},{"fixed":"d9c54763e5cdbbd3f81868597fe8aca3c96e6387"},{"fixed":"1960f2b534da1e6c65fb96f9e98bda773495f406"},{"fixed":"b0028f333420a65a53a63978522db680b37379dd"},{"fixed":"78fbb92af27d0982634116c7a31065f24d092826"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26638.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"}]}