CVE-2026-98947

In the Linux kernel, the following vulnerability has been resolved:

vsock: Fix memory leak in vmci_transport_recv_dgram_cb()

During the closure of a datagram socket, the vmci_transport_recv_dgram_cb() function may be called, which will add the packets to the sockets backlog; then, after the receive queue is cleared, the __release_sock() function will move the packet back from the sockets backlog to the receive queue, which will lead to a memory leak.

sock_close __sock_release __vsock_release // take ownership by user-space lock_sock_nested sock_set_flag(sk, SOCK_DEAD) vmci_transport_release vmci_dispatch_dgs vmci_datagram_invoke_guest_handler vmci_transport_recv_dgram_cb sk_receive_skb if (!sock_owned_by_user(sk)) […] (!) else if sk_add_backlog() […] (!) skb_queue_purge(&sk->sk_receive_queue)

  release_sock
    __release_sock
      // move all packets from the backlog
      // to the receive queue

(!) sk_backlog_rcv vsock_queue_rcv_skb […] __sock_queue_rcv_skb if (!sock_flag(sk, SOCK_DEAD)) // Since the socket is dead, the function will not // be called sk->sk_data_ready(sk) sock_release_ownership(sk); sock_put

Add a receive queue cleanup in the socket destructor to fix this.

syzkaller report:

unreferenced object 0xffff8880117bfb80 (size 240): comm irq/56-vmw_vmci, pid 205, jiffies 4295064448 (age 73.992s) hex dump (first 32 bytes): 78 dc 26 1e 80 88 ff ff 78 dc 26 1e 80 88 ff ff x.&…..x.&….. 00 00 00 00 00 00 00 00 c0 da 26 1e 80 88 ff ff ……….&….. backtrace: [] __alloc_skb+0x287/0x330 net/core/skbuff.c:505 [] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport] [] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci] [] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci] [] vmci_interrupt+0x55/0x290 [vmw_vmci] [] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205 [] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314 [] kthread+0x2e6/0x3a0 kernel/kthread.c:376 [] ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295

Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller.

Affected Software

References

• https://git.kernel.org/stable/c/0f8e2b2045355a0ee2008125e573435504b13cee
• https://git.kernel.org/stable/c/4835dbcde5cc3ae37e0d0796052056b35fcae8bf
• https://git.kernel.org/stable/c/7c24a4e87e219072e5e106f6791146cbf3b056b3
• https://git.kernel.org/stable/c/9907db2b8e7ba70b442bb9dec86526a6511fac62