CVE-2024-35944 (GCVE-0-2024-35944)
Vulnerability from cvelistv5 – Published: 2024-05-19 10:10 – Updated: 2026-05-12 11:53
VLAI
EPSS
VEX
Title
VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()
Summary
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."
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-20 14:30 UTC
Assigner
References
12 references
Impacted products
6 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a110b7ebb9c674a2b591af2780dd512ad0198d50 , < e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051
(git)
Affected: a110b7ebb9c674a2b591af2780dd512ad0198d50 , < f15eca95138b3d4ec17b63c3c1937b0aa0d3624b (git) Affected: a110b7ebb9c674a2b591af2780dd512ad0198d50 , < ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100 (git) Affected: a110b7ebb9c674a2b591af2780dd512ad0198d50 , < 130b0cd064874e0d0f58e18fb00e6f3993e90c74 (git) Affected: a110b7ebb9c674a2b591af2780dd512ad0198d50 , < feacd430b42bbfa9ab3ed9e4f38b86c43e348c75 (git) Affected: a110b7ebb9c674a2b591af2780dd512ad0198d50 , < dae70a57565686f16089737adb8ac64471570f73 (git) Affected: a110b7ebb9c674a2b591af2780dd512ad0198d50 , < 491a1eb07c2bd8841d63cb5263455e185be5866f (git) Affected: a110b7ebb9c674a2b591af2780dd512ad0198d50 , < 19b070fefd0d024af3daa7329cbc0d00de5302ec (git) |
guessed | |
| Linux | Linux |
Affected:
3.9
Unaffected: 0 , < 3.9 (semver) Unaffected: 4.19.312 , ≤ 4.19.* (semver) Unaffected: 5.4.274 , ≤ 5.4.* (semver) Unaffected: 5.10.215 , ≤ 5.10.* (semver) Unaffected: 5.15.155 , ≤ 5.15.* (semver) Unaffected: 6.1.86 , ≤ 6.1.* (semver) Unaffected: 6.6.27 , ≤ 6.6.* (semver) Unaffected: 6.8.6 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.0 , < V3.1.5
(custom)
|
guessed |
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"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 \u0027WARNING in dg_dispatch_as_host\u0027 bug.\\n\\nmemcpy: detected field-spanning write (size 56) of single field \\\"\u0026dg_info-\u003emsg\\\"\\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)-\u003epayload_size)\\n/// This is 24 + payload_size\\n\\nmemcpy(\u0026dg_info-\u003emsg, dg, dg_size);\\n\\tDestination = dg_info-\u003emsg ---\u003e this is a 24 byte\\n\\t\\t\\t\\t\\tstructure(struct vmci_datagram)\\n\\tSource = dg --\u003e 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 \u0027ADVERTENCIA en dg_dispatch_as_host\u0027. memcpy: se detect\\u00f3 escritura que abarca todos los campos (tama\\u00f1o 56) de un solo campo \\\"\u0026amp;dg_info-\u0026gt;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)-\u0026gt;payload_size ) /// Esto es 24 + payload_size memcpy(\u0026amp;dg_info-\u0026gt;msg, dg, dg_size); Destino = dg_info-\u0026gt;msg ---\u0026gt; esta es una estructura de 24 bytes (struct vmci_datagram) Fuente = dg --\u0026gt; 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": "2024-11-21T09:21:15.537",
"published": "2024-05-19T11:15:50.017",
"references": "[{\"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\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2024-35944\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-19T11:15:50.017\",\"lastModified\":\"2026-06-17T07:35:46.593\",\"vulnStatus\":\"Modified\",\"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 \u0027WARNING in dg_dispatch_as_host\u0027 bug.\\n\\nmemcpy: detected field-spanning write (size 56) of single field \\\"\u0026dg_info-\u003emsg\\\"\\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)-\u003epayload_size)\\n/// This is 24 + payload_size\\n\\nmemcpy(\u0026dg_info-\u003emsg, dg, dg_size);\\n\\tDestination = dg_info-\u003emsg ---\u003e this is a 24 byte\\n\\t\\t\\t\\t\\tstructure(struct vmci_datagram)\\n\\tSource = dg --\u003e 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 \u0027ADVERTENCIA en dg_dispatch_as_host\u0027. memcpy: se detect\u00f3 escritura que abarca todos los campos (tama\u00f1o 56) de un solo campo \\\"\u0026amp;dg_info-\u0026gt;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)-\u0026gt;payload_size ) /// Esto es 24 + payload_size memcpy(\u0026amp;dg_info-\u0026gt;msg, dg, dg_size); Destino = dg_info-\u0026gt;msg ---\u0026gt; esta es una estructura de 24 bytes (struct vmci_datagram) Fuente = dg --\u0026gt; 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\\\".\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/misc/vmw_vmci/vmci_datagram.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"f15eca95138b3d4ec17b63c3c1937b0aa0d3624b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"130b0cd064874e0d0f58e18fb00e6f3993e90c74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"feacd430b42bbfa9ab3ed9e4f38b86c43e348c75\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"dae70a57565686f16089737adb8ac64471570f73\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"491a1eb07c2bd8841d63cb5263455e185be5866f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a110b7ebb9c674a2b591af2780dd512ad0198d50\",\"lessThan\":\"19b070fefd0d024af3daa7329cbc0d00de5302ec\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/misc/vmw_vmci/vmci_datagram.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.312\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.274\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.215\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.155\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.86\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.27\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8.6\",\"lessThanOrEqual\":\"6.8.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.0\",\"lessThan\":\"V3.1.5\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.0\",\"lessThan\":\"V3.1.5\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.0\",\"lessThan\":\"V3.1.5\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.0\",\"lessThan\":\"V3.1.5\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.0\",\"lessThan\":\"V3.1.5\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-05-20T14:30:02.800597Z\",\"id\":\"CVE-2024-35944\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-28T08:04:35+00:00",
"cve": "CVE-2024-35944",
"id": "CVE-2024-35944",
"initial_release_date": "2024-05-19T00:00:00+00:00",
"product_status:fixed": "709",
"product_status:known_affected": "64",
"product_status:known_not_affected": "8",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35944.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T00:39:56Z",
"cve": "CVE-2024-35944",
"id": "CVE-2024-35944",
"initial_release_date": "2024-05-21T01:58:59Z",
"product_status:known_affected": "461",
"product_status:known_not_affected": "6",
"product_status:recommended": "770",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-35944",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-35944.json",
"version": "116"
},
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resolved:\\n\\nVMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()\\n\\nSyzkaller hit \u0027WARNING in dg_dispatch_as_host\u0027 bug.\\n\\nmemcpy: detected field-spanning write (size 56) of single field \\\"\u0026dg_info-\u003emsg\\\"\\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)-\u003epayload_size)\\n/// This is 24 + payload_size\\n\\nmemcpy(\u0026dg_info-\u003emsg, dg, dg_size);\\n\\tDestination = dg_info-\u003emsg ---\u003e this is a 24 byte\\n\\t\\t\\t\\t\\tstructure(struct vmci_datagram)\\n\\tSource = dg --\u003e 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.\\\"\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.312\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": 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"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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