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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986590)

medium Nessus Plugin ID 268868

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-2025-986590 advisory.

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

 PCI: Add missing bridge lock to pci_bus_lock()

 One of the true positives that the cfg_access_lock lockdep effort identified is this sequence:

 WARNING: CPU: 14 PID: 1 at drivers/pci/pci.c:4886 pci_bridge_secondary_bus_reset+0x5d/0x70 RIP: 0010:pci_bridge_secondary_bus_reset+0x5d/0x70 Call Trace:
 <TASK> ? __warn+0x8c/0x190 ? pci_bridge_secondary_bus_reset+0x5d/0x70 ? report_bug+0x1f8/0x200 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x18/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? pci_bridge_secondary_bus_reset+0x5d/0x70 pci_reset_bus+0x1d8/0x270 vmd_probe+0x778/0xa10 pci_device_probe+0x95/0x120

 Where pci_reset_bus() users are triggering unlocked secondary bus resets.
 Ironically pci_bus_reset(), several calls down from pci_reset_bus(), uses pci_bus_lock() before issuing the reset which locks everything *but* the bridge itself.

 For the same motivation as adding:

 bridge = pci_upstream_bridge(dev);
 if (bridge) pci_dev_lock(bridge);

 to pci_reset_function() for the bus and cxl_bus reset cases, add pci_dev_lock() for @bus->self to pci_bus_lock().

 [bhelgaas: squash in recursive locking deadlock fix from Keith Busch:
 https://lore.kernel.org/r/[email protected]]

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?5aae1727

https://nvd.nist.gov/vuln/detail/CVE-2024-46750

Plugin Details

Severity: Medium

ID: 268868

File Name: unity_linux_UTSA-2025-986590.nasl

Version: 1.2

Type: local

Published: 10/7/2025

Updated: 10/15/2025

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-2024-46750

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: 9/22/2025

Vulnerability Publication Date: 12/12/2023

Reference Information

CVE: CVE-2024-46750