CVE-2024-35944 (GCVE-0-2024-35944)

Vulnerability from cvelistv5 – Published: 2024-05-19 10:10 – Updated: 2026-01-05 10:36
VLAI?
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.
Assigner
References
Impacted products
Vendor Product Version
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)
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    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)
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\"lessThan\": \"3.9\", \"versionType\": \"semver\"}, {\"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-1.2.0\"}, \"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.\\\"\"}], \"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\": \"5.4.274\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.155\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.86\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.27\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.6\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"3.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:36:02.870Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35944\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:36:02.870Z\", \"dateReserved\": \"2024-05-17T13:50:33.133Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-19T10:10:48.183Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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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.



Detection rules are retrieved from Rulezet.