{"id":"CVE-2026-98947","state":"PUBLISHED","title":"vsock: Fix memory leak in vmci_transport_recv_dgram_cb()","description":"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->sk_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->sk_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 [] __alloc_skb+0x287/0x330 net/core/skbuff.c:505\n [] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport]\n [] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci]\n [] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci]\n [] vmci_interrupt+0x55/0x290 [vmw_vmci]\n [] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205\n [] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314\n [] kthread+0x2e6/0x3a0 kernel/kthread.c:376\n [] 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.","publishedAt":"2026-10-23T12:19:06.146Z","updatedAt":"2026-10-23T12:19:06.146Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"0f8e2b2045355a0ee2008125e573435504b13cee","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"4835dbcde5cc3ae37e0d0796052056b35fcae8bf","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"9907db2b8e7ba70b442bb9dec86526a6511fac62","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"7c24a4e87e219072e5e106f6791146cbf3b056b3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.9","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]}],"references":["https://git.kernel.org/stable/c/0f8e2b2045355a0ee2008125e573435504b13cee","https://git.kernel.org/stable/c/4835dbcde5cc3ae37e0d0796052056b35fcae8bf","https://git.kernel.org/stable/c/9907db2b8e7ba70b442bb9dec86526a6511fac62","https://git.kernel.org/stable/c/7c24a4e87e219072e5e106f6791146cbf3b056b3"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98947.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98947","state":"PUBLISHED","datePublished":"2026-10-23T12:19:06.146Z","dateUpdated":"2026-10-23T12:19:06.146Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.381Z"},"containers":{"cna":{"title":"vsock: Fix memory leak in vmci_transport_recv_dgram_cb()","descriptions":[{"lang":"en","value":"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->sk_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->sk_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 [] __alloc_skb+0x287/0x330 net/core/skbuff.c:505\n [] vmci_transport_recv_dgram_cb+0xbd/0x210 [vmw_vsock_vmci_transport]\n [] vmci_datagram_invoke_guest_handler+0x366/0x450 [vmw_vmci]\n [] vmci_dispatch_dgs+0x235/0x490 [vmw_vmci]\n [] vmci_interrupt+0x55/0x290 [vmw_vmci]\n [] irq_thread_fn+0x8b/0x1a0 kernel/irq/manage.c:1205\n [] irq_thread+0x28e/0x530 kernel/irq/manage.c:1314\n [] kthread+0x2e6/0x3a0 kernel/kthread.c:376\n [] 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"0f8e2b2045355a0ee2008125e573435504b13cee","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"4835dbcde5cc3ae37e0d0796052056b35fcae8bf","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"9907db2b8e7ba70b442bb9dec86526a6511fac62","versionType":"git"},{"version":"d021c344051af91f42c5ba9fdedc176740cbd238","status":"affected","lessThan":"7c24a4e87e219072e5e106f6791146cbf3b056b3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.9","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/vmw_vsock/af_vsock.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0f8e2b2045355a0ee2008125e573435504b13cee"},{"url":"https://git.kernel.org/stable/c/4835dbcde5cc3ae37e0d0796052056b35fcae8bf"},{"url":"https://git.kernel.org/stable/c/9907db2b8e7ba70b442bb9dec86526a6511fac62"},{"url":"https://git.kernel.org/stable/c/7c24a4e87e219072e5e106f6791146cbf3b056b3"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-23T12:19:06.146Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}