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Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013081)

high Nessus Plugin ID 307831

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-2026-013081 advisory.

 In the Linux kernel, the following vulnerability has been resolved:

 usb: dwc3: Fix race condition between concurrent dwc3_remove_requests() call paths

 This patch addresses a race condition caused by unsynchronized execution of multiple call paths invoking `dwc3_remove_requests()`, leading to premature freeing of USB requests and subsequent crashes.

 Three distinct execution paths interact with `dwc3_remove_requests()`:
 Path 1:
 Triggered via `dwc3_gadget_reset_interrupt()` during USB reset handling. The call stack includes:
 - `dwc3_ep0_reset_state()`
 - `dwc3_ep0_stall_and_restart()`
 - `dwc3_ep0_out_start()`
 - `dwc3_remove_requests()`
 - `dwc3_gadget_del_and_unmap_request()`

 Path 2:
 Also initiated from `dwc3_gadget_reset_interrupt()`, but through `dwc3_stop_active_transfers()`. The call stack includes:
 - `dwc3_stop_active_transfers()`
 - `dwc3_remove_requests()`
 - `dwc3_gadget_del_and_unmap_request()`

 Path 3:
 Occurs independently during `adb root` execution, which triggers USB function unbind and bind operations. The sequence includes:
 - `gserial_disconnect()`
 - `usb_ep_disable()`
 - `dwc3_gadget_ep_disable()`
 - `dwc3_remove_requests()` with `-ESHUTDOWN` status

 Path 3 operates asynchronously and lacks synchronization with Paths 1 and 2. When Path 3 completes, it disables endpoints and frees 'out' requests. If Paths 1 or 2 are still processing these requests, accessing freed memory leads to a crash due to use-after-free conditions.

 To fix this added check for request completion and skip processing if already completed and added the request status for ep0 while queue.

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?f701c36f

http://www.nessus.org/u?893c919e

https://nvd.nist.gov/vuln/detail/CVE-2025-68287

Plugin Details

Severity: High

ID: 307831

File Name: unity_linux_UTSA-2026-013081.nasl

Version: 1.1

Type: Local

Published: 4/21/2026

Updated: 4/21/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6

Temporal Score: 4.4

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

CVSS Score Source: CVE-2025-68287

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.1

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

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

Vulnerability Information

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/21/2026

Vulnerability Publication Date: 12/9/2025

Reference Information

CVE: CVE-2025-68287