{"id":"CVE-2026-98947","summary":"vsock: Fix memory leak in vmci_transport_recv_dgram_cb()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock: Fix memory leak in vmci_transport_recv_dgram_cb()\n\nDuring the closure of a datagram socket, the vmci_transport_recv_dgram_cb()\nfunction may be called, which will add the packets\nto the socket's backlog; then, after the receive queue is cleared,\nthe __release_sock() function will move the packet back from the socket's\nbacklog to the receive queue, which will lead to a memory leak.\n\nsock_close\n  __sock_release\n    __vsock_release\n      // take ownership by user-space\n      lock_sock_nested\n      sock_set_flag(sk, SOCK_DEAD)\n      vmci_transport_release\n                                      vmci_dispatch_dgs\n                                        vmci_datagram_invoke_guest_handler\n                                          vmci_transport_recv_dgram_cb\n                                            sk_receive_skb\n                                              if (!sock_owned_by_user(sk))\n                                                  [...]\n                                         (!)  else if sk_add_backlog()\n                                                  [...]\n  (!) skb_queue_purge(&sk-\u003esk_receive_queue)\n\n      release_sock\n        __release_sock\n          // move all packets from the backlog\n          // to the receive queue\n   (!)    sk_backlog_rcv\n            vsock_queue_rcv_skb\n            [...]\n              __sock_queue_rcv_skb\n                if (!sock_flag(sk, SOCK_DEAD))\n                  // Since the socket is \"dead\", the function will not\n                  // be called\n                  sk-\u003esk_data_ready(sk)\n        sock_release_ownership(sk);\n        sock_put\n\nAdd a receive queue cleanup in the socket destructor to fix this.\n\nsyzkaller report:\n\nunreferenced object 0xffff8880117bfb80 (size 240):\n  comm \"irq/56-vmw_vmci\", pid 205, jiffies 4295064448 (age 73.992s)\n  hex dump (first 32 bytes):\n    78 dc 26 1e 80 88 ff ff 78 dc 26 1e 80 88 ff ff  x.&.....x.&.....\n    00 00 00 00 00 00 00 00 c0 da 26 1e 80 88 ff ff  ..........&.....\n  backtrace:\n    [\u003cffffffff82be8d97\u003e] __alloc_skb+0x287/0x330 net/core/skbuff.c:505\n    [\u003cffffffffa114bcbd\u003e] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport]\n    [\u003cffffffffa05072c6\u003e] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci]\n    [\u003cffffffffa050ad75\u003e] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci]\n    [\u003cffffffffa050b025\u003e] vmci_interrupt+0x55/0x290 [vmw_vmci]\n    [\u003cffffffff8137ad2b\u003e] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205\n    [\u003cffffffff8137c7ae\u003e] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314\n    [\u003cffffffff81253dd6\u003e] kthread+0x2e6/0x3a0 kernel/kthread.c:376\n    [\u003cffffffff81004392\u003e] ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295\n\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with Syzkaller.","modified":"2026-10-25T02:47:28.599400555Z","published":"2026-10-23T12:19:06.146Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98947.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f8e2b2045355a0ee2008125e573435504b13cee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4835dbcde5cc3ae37e0d0796052056b35fcae8bf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7c24a4e87e219072e5e106f6791146cbf3b056b3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9907db2b8e7ba70b442bb9dec86526a6511fac62"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98947.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98947"},{"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":"d021c344051af91f42c5ba9fdedc176740cbd238"},{"fixed":"0f8e2b2045355a0ee2008125e573435504b13cee"},{"fixed":"4835dbcde5cc3ae37e0d0796052056b35fcae8bf"},{"fixed":"9907db2b8e7ba70b442bb9dec86526a6511fac62"},{"fixed":"7c24a4e87e219072e5e106f6791146cbf3b056b3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98947.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98947.json"}}],"schema_version":"1.9.2"}