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Unity Linux 20.1050e Security Update: kernel (UTSA-2026-007392)

medium Nessus Plugin ID 307335

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-007392 advisory.

 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.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected kernel package.

See Also

http://www.nessus.org/u?9a4bf497

http://www.nessus.org/u?df8818e0

https://nvd.nist.gov/vuln/detail/CVE-2024-35944

Plugin Details

Severity: Medium

ID: 307335

File Name: unity_linux_UTSA-2026-007392.nasl

Version: 1.1

Type: Local

Published: 4/17/2026

Updated: 4/17/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2024-35944

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/17/2026

Vulnerability Publication Date: 12/12/2023

Reference Information

CVE: CVE-2024-35944