{"id":"CVE-2024-35944","revision":"ccf5d03355b24c3ebed2d690b2490aa8","records":[{"revision":"ccf5d03355b24c3ebed2d690b2490aa8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-35944","aliases":[],"title":"VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nVMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()\n\nSyzkaller hit 'WARNING in dg_dispatch_as_host' bug.\n\nmemcpy: detected field-spanning write (size 56) of single field \"&dg_info->msg\"\nat drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24)\n\nWARNING: CPU: 0 PID: 1555 at drivers/misc/vmw_vmci/vmci_datagram.c:237\ndg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237\n\nSome code commentry, based on my understanding:\n\n544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size)\n/// This is 24 + payload_size\n\nmemcpy(&dg_info->msg, dg, dg_size);\n\tDestination = dg_info->msg ---> this is a 24 byte\n\t\t\t\t\tstructure(struct vmci_datagram)\n\tSource = dg --> this is a 24 byte structure (struct vmci_datagram)\n\tSize = dg_size = 24 + payload_size\n\n{payload_size = 56-24 =32} -- Syzkaller managed to set payload_size to 32.\n\n 35 struct delayed_datagram_info {\n 36         struct datagram_entry *entry;\n 37         struct work_struct work;\n 38         bool in_dg_host_queue;\n 39         /* msg and msg_payload must be together. */\n 40         struct vmci_datagram msg;\n 41         u8 msg_payload[];\n 42 };\n\nSo those extra bytes of payload are copied into msg_payload[], a run time\nwarning is seen while fuzzing with Syzkaller.\n\nOne possible way to fix the warning is to split the memcpy() into\ntwo parts -- one -- direct assignment of msg and second taking care of payload.\n\nGustavo quoted:\n\"Under FORTIFY_SOURCE we should not copy data across multiple members\nin a structure.\"","state":0,"publishedAt":"2024-05-19T10:10:48.183+00:00","modifiedAt":"2026-10-15T00:41:37.801+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/misc/vmw_vmci/vmci_datagram.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"f15eca95138b3d4ec17b63c3c1937b0aa0d3624b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"130b0cd064874e0d0f58e18fb00e6f3993e90c74\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"feacd430b42bbfa9ab3ed9e4f38b86c43e348c75\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"dae70a57565686f16089737adb8ac64471570f73\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"491a1eb07c2bd8841d63cb5263455e185be5866f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\n                            \"lessThan\": \"19b070fefd0d024af3daa7329cbc0d00de5302ec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/misc/vmw_vmci/vmci_datagram.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.9\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.19.312\",\n                            \"lessThanOrEqual\": \"4.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.274\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.215\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.155\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.86\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.27\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.8.6\",\n                            \"lessThanOrEqual\": \"6.8.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.9\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051","https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b","https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100","https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74","https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75","https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73","https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f","https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-35944","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-35944","identifiers":["CVE-2024-35944"]},"retained":false,"historicalAffected":[]}],"coverage":[]}