FKIE_CVE-2024-35944

Vulnerability from fkie_nvd - Published: 2024-05-19 11:15 - Updated: 2025-12-17 03:38
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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."
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ecPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ecPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List, Third Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 10.0
To clipboard 

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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": "2025-12-17T03:38:40.920",
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-05-19T11:15:50.017",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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      "source": "nvd@nist.gov",
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}


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  • 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.
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