CVE-2024-35944VMCI: Fix memcpy() run-time warning in dg_dispatch_as_host()
Updated under an hour ago ()
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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."
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from a110b7ebb9c674a2b591af2780dd512ad0198d50 before e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051; from a110b7ebb9c674a2b591af2780dd512ad0198d50 before f15eca95138b3d4ec17b63c3c1937b0aa0d3624b; from a110b7ebb9c674a2b591af2780dd512ad0198d50 before ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100; from a110b7ebb9c674a2b591af2780dd512ad0198d50 before 130b0cd064874e0d0f58e18fb00e6f3993e90c74; from a110b7ebb9c674a2b591af2780dd512ad0198d50 before feacd430b42bbfa9ab3ed9e4f38b86c43e348c75; from a110b7ebb9c674a2b591af2780dd512ad0198d50 before dae70a57565686f16089737adb8ac64471570f73; from a110b7ebb9c674a2b591af2780dd512ad0198d50 before 491a1eb07c2bd8841d63cb5263455e185be5866f; from a110b7ebb9c674a2b591af2780dd512ad0198d50 before 19b070fefd0d024af3daa7329cbc0d00de5302ec | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.0 before V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | before 4.19.312; from 4.20 before 5.4.274; from 5.5 before 5.10.215; from 5.11 before 5.15.155; from 5.16 before 6.1.86; from 6.2 before 6.6.27; from 6.7 before 6.8.6 | NVD |
debian debian_linux debian:debian_linux | 10.0 | NVD |
References
- https://git.kernel.org/stable/c/e87bb99d2df6512d8ee37a5d63d2ca9a39a8c051patch
- https://git.kernel.org/stable/c/f15eca95138b3d4ec17b63c3c1937b0aa0d3624bpatch
- https://git.kernel.org/stable/c/ad78c5047dc4076d0b3c4fad4f42ffe9c86e8100patch
- https://git.kernel.org/stable/c/130b0cd064874e0d0f58e18fb00e6f3993e90c74patch
- https://git.kernel.org/stable/c/feacd430b42bbfa9ab3ed9e4f38b86c43e348c75patch
- https://git.kernel.org/stable/c/dae70a57565686f16089737adb8ac64471570f73patch
- https://git.kernel.org/stable/c/491a1eb07c2bd8841d63cb5263455e185be5866fpatch
- https://git.kernel.org/stable/c/19b070fefd0d024af3daa7329cbc0d00de5302ecpatch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlmailing-list, third-party-advisory
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlmailing-list, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.