CVE-2024-26638

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nbd: always initialize struct msghdr completely<br /> <br /> syzbot complains that msg-&gt;msg_get_inq value can be uninitialized [1]<br /> <br /> struct msghdr got many new fields recently, we should always make<br /> sure their values is zero by default.<br /> <br /> [1]<br /> BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571<br /> tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571<br /> inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879<br /> sock_recvmsg_nosec net/socket.c:1044 [inline]<br /> sock_recvmsg+0x12b/0x1e0 net/socket.c:1066<br /> __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538<br /> nbd_read_reply drivers/block/nbd.c:732 [inline]<br /> recv_work+0x262/0x3100 drivers/block/nbd.c:863<br /> process_one_work kernel/workqueue.c:2627 [inline]<br /> process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700<br /> worker_thread+0xf45/0x1490 kernel/workqueue.c:2781<br /> kthread+0x3ed/0x540 kernel/kthread.c:388<br /> ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147<br /> ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242<br /> <br /> Local variable msg created at:<br /> __sock_xmit+0x4c/0x5c0 drivers/block/nbd.c:513<br /> nbd_read_reply drivers/block/nbd.c:732 [inline]<br /> recv_work+0x262/0x3100 drivers/block/nbd.c:863<br /> <br /> CPU: 1 PID: 7465 Comm: kworker/u5:1 Not tainted 6.7.0-rc7-syzkaller-00041-gf016f7547aee #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023<br /> Workqueue: nbd5-recv recv_work