{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2024-35944", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-17T13:50:33.133Z", "datePublished": "2024-05-19T10:10:48.183Z", "dateUpdated": "2024-11-05T09:25:27.732Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-05T09:25:27.732Z"}, "descriptions": [{"lang": "en", "value": "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.\""}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/vmw_vmci/vmci_datagram.c"], "versions": [{"version": "1da177e4c3f4", "lessThan": "e87bb99d2df6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "f15eca95138b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "ad78c5047dc4", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "130b0cd06487", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "feacd430b42b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": "dae70a575656", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f4", "lessThan": 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"Linux", "product": "Linux", "versions": [{"status": "unaffected", "version": "4.19.312", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.274", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.215", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.155", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.86", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.27", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.8.6", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/misc/vmw_vmci/vmci_datagram.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051"}, {"url": "https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b"}, {"url": "https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100"}, {"url": "https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74"}, {"url": "https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75"}, {"url": "https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73"}, {"url": "https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f"}, {"url": "https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec"}], "x_generator": {"engine": "bippy-9e1c9544281a"}, "descriptions": [{"lang": "en", "value": "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.\""}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-05T09:25:27.732Z"}}}, "cveMetadata": {"cveId": "CVE-2024-35944", "state": "PUBLISHED", "dateUpdated": "2024-11-05T09:25:27.732Z", "dateReserved": "2024-05-17T13:50:33.133Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-19T10:10:48.183Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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.\""}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: VMCI: corrigi\u00f3 la advertencia de tiempo de ejecuci\u00f3n de memcpy() en dg_dispatch_as_host() Syzkaller presion\u00f3 el error 'ADVERTENCIA en dg_dispatch_as_host'. memcpy: se detect\u00f3 escritura que abarca todos los campos (tama\u00f1o 56) de un solo campo \"&dg_info->msg\" en drivers/misc/vmw_vmci/vmci_datagram.c:237 (tama\u00f1o 24) ADVERTENCIA: CPU: 0 PID: 1555 en drivers/misc/vmw_vmci /vmci_datagram.c:237 dg_dispatch_as_host+0x88e/0xa60 drivers/misc/vmw_vmci/vmci_datagram.c:237 Algunos comentarios de c\u00f3digo, seg\u00fan tengo entendido: 544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size ) /// Esto es 24 + payload_size memcpy(&dg_info->msg, dg, dg_size); Destino = dg_info->msg ---> esta es una estructura de 24 bytes (struct vmci_datagram) Fuente = dg --> esta es una estructura de 24 bytes (struct vmci_datagram) Tama\u00f1o = dg_size = 24 + payload_size {payload_size = 56-24 = 32} -- Syzkaller logr\u00f3 establecer payload_size en 32. 35 struct delay_datagram_info { 36 struct datagram_entry *entry; 37 struct work_struct work; 38 bool in_dg_host_queue; 39 /* msg y msg_payload deben estar juntos. */ 40 struct vmci_datagram mensaje; 41 u8 msg_payload[]; 42}; Entonces, esos bytes adicionales de payload se copian en msg_payload[], se ve una advertencia de tiempo de ejecuci\u00f3n mientras se utiliza Syzkaller. Una forma posible de solucionar la advertencia es dividir memcpy() en dos partes: una, asignaci\u00f3n directa del mensaje y la segunda, encargada del payload. Gustavo cit\u00f3: \"Bajo FORTIFY_SOURCE no debemos copiar datos entre varios miembros de una estructura\"."}], "id": "CVE-2024-35944", "lastModified": "2024-11-05T10:16:55.537", "metrics": {}, "published": "2024-05-19T11:15:50.017", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"affected_release": [{"advisory": "RHSA-2024:7001", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:7000", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.22.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()", "id": "2281807", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2281807"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nVMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()\nSyzkaller hit 'WARNING in dg_dispatch_as_host' bug.\nmemcpy: detected field-spanning write (size 56) of single field \"&dg_info->msg\"\nat drivers/misc/vmw_vmci/vmci_datagram.c:237 (size 24)\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\nSome code commentry, based on my understanding:\n544 #define VMCI_DG_SIZE(_dg) (VMCI_DG_HEADERSIZE + (size_t)(_dg)->payload_size)\n/// This is 24 + payload_size\nmemcpy(&dg_info->msg, dg, dg_size);\nDestination = dg_info->msg ---> this is a 24 byte\nstructure(struct vmci_datagram)\nSource = dg --> this is a 24 byte structure (struct vmci_datagram)\nSize = dg_size = 24 + payload_size\n{payload_size = 56-24 =32} -- Syzkaller managed to set payload_size to 32.\n35 struct delayed_datagram_info {\n36 struct datagram_entry *entry;\n37 struct work_struct work;\n38 bool in_dg_host_queue;\n39 /* msg and msg_payload must be together. */\n40 struct vmci_datagram msg;\n41 u8 msg_payload[];\n42 };\nSo those extra bytes of payload are copied into msg_payload[], a run time\nwarning is seen while fuzzing with Syzkaller.\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.\nGustavo quoted:\n\"Under FORTIFY_SOURCE we should not copy data across multiple members\nin a structure.\""], "name": "CVE-2024-35944", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-35944\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-35944\nhttps://lore.kernel.org/linux-cve-announce/2024051920-CVE-2024-35944-a860@gregkh/T"], "threat_severity": "Low", "upstream_fix": "kernel 4.19.312, kernel 5.4.274, kernel 5.10.215, kernel 5.15.155, kernel 6.1.86, kernel 6.6.27, kernel 6.8.6, kernel 6.9"}