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Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098838)

medium Nessus Plugin ID 340481

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-2026-098838 advisory.

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

 usb: gadget: f_fs: Remove WARN_ON in functionfs_bind

 This commit addresses an issue related to below kernel panic where panic_on_warn is enabled. It is caused by the unnecessary use of WARN_ON in functionsfs_bind, which easily leads to the following scenarios.

 1.adb_write in adbd 2. UDC write via configfs ================= =====================

 ->usb_ffs_open_thread() ->UDC write
 ->open_functionfs() ->configfs_write_iter()
 ->adb_open() ->gadget_dev_desc_UDC_store()
 ->adb_write() ->usb_gadget_register_driver_owner
 ->driver_register()
 ->StartMonitor() ->bus_add_driver()
 ->adb_read() ->gadget_bind_driver() <times-out without BIND event> ->configfs_composite_bind()
 ->usb_add_function()
 ->open_functionfs() ->ffs_func_bind()
 ->adb_open() ->functionfs_bind() <ffs->state !=FFS_ACTIVE>

 The adb_open, adb_read, and adb_write operations are invoked from the daemon, but trying to bind the function is a process that is invoked by UDC write through configfs, which opens up the possibility of a race condition between the two paths. In this race scenario, the kernel panic occurs due to the WARN_ON from functionfs_bind when panic_on_warn is enabled. This commit fixes the kernel panic by removing the unnecessary WARN_ON.

 Kernel panic - not syncing: kernel: panic_on_warn set ...
 [ 14.542395] Call trace:
 [ 14.542464] ffs_func_bind+0x1c8/0x14a8 [ 14.542468] usb_add_function+0xcc/0x1f0 [ 14.542473] configfs_composite_bind+0x468/0x588 [ 14.542478] gadget_bind_driver+0x108/0x27c [ 14.542483] really_probe+0x190/0x374 [ 14.542488] __driver_probe_device+0xa0/0x12c [ 14.542492] driver_probe_device+0x3c/0x220 [ 14.542498] __driver_attach+0x11c/0x1fc [ 14.542502] bus_for_each_dev+0x104/0x160 [ 14.542506] driver_attach+0x24/0x34 [ 14.542510] bus_add_driver+0x154/0x270 [ 14.542514] driver_register+0x68/0x104 [ 14.542518] usb_gadget_register_driver_owner+0x48/0xf4 [ 14.542523] gadget_dev_desc_UDC_store+0xf8/0x144 [ 14.542526] configfs_write_iter+0xf0/0x138

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

https://nvd.nist.gov/vuln/detail/CVE-2024-57913

http://www.nessus.org/u?3399a826

http://www.nessus.org/u?f8aea815

Plugin Details

Severity: Medium

ID: 340481

File Name: unity_linux_UTSA-2026-098838.nasl

Version: 1.1

Type: Local

Published: 8/26/2026

Updated: 8/26/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

CVSS v2

Risk Factor: Low

Base Score: 3.8

Temporal Score: 2.8

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

CVSS Score Source: CVE-2024-57913

CVSS v3

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 4.1

Vector: CVSS:3.0/AV:L/AC:H/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: 8/10/2026

Vulnerability Publication Date: 4/9/2024

Reference Information

CVE: CVE-2024-57913