VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-35944
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-05-19 11:15:50 UTC
Updated2026-05-12 12:16:42 UTC
DescriptionIn 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."

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051 git Not specified
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 f15eca95138b3d4ec17b63c3c1937b0aa0d3624b git Not specified
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100 git Not specified
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 130b0cd064874e0d0f58e18fb00e6f3993e90c74 git Not specified
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 feacd430b42bbfa9ab3ed9e4f38b86c43e348c75 git Not specified
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 dae70a57565686f16089737adb8ac64471570f73 git Not specified
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 491a1eb07c2bd8841d63cb5263455e185be5866f git Not specified
CNA Linux Linux affected a110b7ebb9c674a2b591af2780dd512ad0198d50 19b070fefd0d024af3daa7329cbc0d00de5302ec git Not specified
CNA Linux Linux affected 3.9 Not specified
CNA Linux Linux unaffected 3.9 semver Not specified
CNA Linux Linux unaffected 4.19.312 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.274 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.215 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.155 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.86 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.27 6.6.* semver Not specified
CNA Linux Linux unaffected 6.8.6 6.8.* semver Not specified
CNA Linux Linux unaffected 6.9 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866f af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624b af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00020.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ec af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
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