Ubuntu: (Multiple Advisories) (CVE-2024-35944): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host() Syzkaller hit 'WARNING in dg_dispatch_as_host' bug. memcpy: detected field-spanning write (size 56) of single field "&dg_info->msg" at drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24) WARNING: CPU: 0 PID: 1555 at drivers/misc/vmw_vmci/vmci_datagram.c:237 dg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237 Some code commentry, based on my understanding: 544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size) /// This is 24 + payload_size memcpy(&dg_info->msg, dg, dg_size); Destination = dg_info->msg ---> this is a 24 byte structure(struct vmci_datagram) Source = dg --> this is a 24 byte structure (struct vmci_datagram) Size = dg_size = 24 + payload_size {payload_size = 56-24 =32} -- Syzkaller managed to set payload_size to 32. 35 struct delayed_datagram_info { 36 struct datagram_entry *entry; 37 struct work_struct work; 38 bool in_dg_host_queue; 39 /* msg and msg_payload must be together. */ 40 struct vmci_datagram msg; 41 u8 msg_payload[]; 42 }; So those extra bytes of payload are copied into msg_payload[], a run time warning is seen while fuzzing with Syzkaller. One possible way to fix the warning is to split the memcpy() into two parts -- one -- direct assignment of msg and second taking care of payload. Gustavo quoted: "Under FORTIFY_SOURCE we should not copy data across multiple members in a structure."
Solution(s)
- ubuntu-upgrade-linux-image-5-15-0-1048-gkeop
- ubuntu-upgrade-linux-image-5-15-0-1058-ibm
- ubuntu-upgrade-linux-image-5-15-0-1060-intel-iotg
- ubuntu-upgrade-linux-image-5-15-0-1060-nvidia
- ubuntu-upgrade-linux-image-5-15-0-1060-nvidia-lowlatency
- ubuntu-upgrade-linux-image-5-15-0-1062-gke
- ubuntu-upgrade-linux-image-5-15-0-1062-kvm
- ubuntu-upgrade-linux-image-5-15-0-1063-oracle
- ubuntu-upgrade-linux-image-5-15-0-1064-gcp
- ubuntu-upgrade-linux-image-5-15-0-1068-azure
- ubuntu-upgrade-linux-image-5-15-0-116-generic
- ubuntu-upgrade-linux-image-5-15-0-116-generic-64k
- ubuntu-upgrade-linux-image-5-15-0-116-generic-lpae
- ubuntu-upgrade-linux-image-5-4-0-1075-ibm
- ubuntu-upgrade-linux-image-5-4-0-1088-bluefield
- ubuntu-upgrade-linux-image-5-4-0-1095-gkeop
- ubuntu-upgrade-linux-image-5-4-0-1116-kvm
- ubuntu-upgrade-linux-image-5-4-0-1127-oracle
- ubuntu-upgrade-linux-image-5-4-0-1132-gcp
- ubuntu-upgrade-linux-image-5-4-0-1133-azure
- ubuntu-upgrade-linux-image-5-4-0-189-generic
- ubuntu-upgrade-linux-image-5-4-0-189-generic-lpae
- ubuntu-upgrade-linux-image-5-4-0-189-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1006-gke
- ubuntu-upgrade-linux-image-6-8-0-1007-intel
- ubuntu-upgrade-linux-image-6-8-0-1007-raspi
- ubuntu-upgrade-linux-image-6-8-0-1008-ibm
- ubuntu-upgrade-linux-image-6-8-0-1008-oem
- ubuntu-upgrade-linux-image-6-8-0-1009-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1009-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1010-azure
- ubuntu-upgrade-linux-image-6-8-0-1010-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-1010-gcp
- ubuntu-upgrade-linux-image-6-8-0-38-generic
- ubuntu-upgrade-linux-image-6-8-0-38-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-38-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-38-lowlatency-64k
- ubuntu-upgrade-linux-image-azure
- ubuntu-upgrade-linux-image-azure-cvm
- ubuntu-upgrade-linux-image-azure-fde
- ubuntu-upgrade-linux-image-azure-lts-20-04
- ubuntu-upgrade-linux-image-azure-lts-22-04
- ubuntu-upgrade-linux-image-bluefield
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-gcp-lts-20-04
- ubuntu-upgrade-linux-image-gcp-lts-22-04
- ubuntu-upgrade-linux-image-generic
- ubuntu-upgrade-linux-image-generic-64k
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- ubuntu-upgrade-linux-image-generic-hwe-18-04
- ubuntu-upgrade-linux-image-generic-hwe-24-04
- ubuntu-upgrade-linux-image-generic-lpae
- ubuntu-upgrade-linux-image-gke
- ubuntu-upgrade-linux-image-gke-5-15
- ubuntu-upgrade-linux-image-gkeop
- ubuntu-upgrade-linux-image-gkeop-5-15
- ubuntu-upgrade-linux-image-gkeop-5-4
- ubuntu-upgrade-linux-image-ibm
- ubuntu-upgrade-linux-image-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-20-04
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- ubuntu-upgrade-linux-image-intel
- ubuntu-upgrade-linux-image-intel-iotg
- ubuntu-upgrade-linux-image-kvm
- ubuntu-upgrade-linux-image-lowlatency
- ubuntu-upgrade-linux-image-lowlatency-64k
- ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-64k
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- ubuntu-upgrade-linux-image-oem
- ubuntu-upgrade-linux-image-oem-24-04
- ubuntu-upgrade-linux-image-oem-24-04a
- ubuntu-upgrade-linux-image-oem-osp1
- ubuntu-upgrade-linux-image-oracle
- ubuntu-upgrade-linux-image-oracle-lts-22-04
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-18-04
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
- Lightweight Endpoint Agent
- Live Dashboards
- Real Risk Prioritization
- IT-Integrated Remediation Projects
- Cloud, Virtual, and Container Assessment
- Integrated Threat Feeds
- Easy-to-Use RESTful API
- Automation-Assisted Patching
- Automated Containment
With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.
– Scott Cheney, Manager of Information Security, Sierra View Medical Center