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Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987025)

medium Nessus Plugin ID 268158

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-2025-987025 advisory.

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

 drm/msm/dp: do not complete dp_aux_cmd_fifo_tx() if irq is not for aux transfer

 There are 3 possible interrupt sources are handled by DP controller, HPDstatus, Controller state changes and Aux read/write transaction.
 At every irq, DP controller have to check isr status of every interrupt sources and service the interrupt if its isr status bits shows interrupts are pending. There is potential race condition may happen at current aux isr handler implementation since it is always complete dp_aux_cmd_fifo_tx() even irq is not for aux read or write transaction. This may cause aux read transaction return premature if host aux data read is in the middle of waiting for sink to complete transferring data to host while irq happen.
 This will cause host's receiving buffer contains unexpected data. This patch fixes this problem by checking aux isr and return immediately at aux isr handler if there are no any isr status bits set.

 Current there is a bug report regrading eDP edid corruption happen during system booting up. After lengthy debugging to found that VIDEO_READY interrupt was continuously firing during system booting up which cause dp_aux_isr() to complete dp_aux_cmd_fifo_tx() prematurely to retrieve data from aux hardware buffer which is not yet contains complete data transfer from sink. This cause edid corruption.

 Follows are the signature at kernel logs when problem happen, EDID has corrupt header panel-simple-dp-aux aux-aea0000.edp: Couldn't identify panel via EDID

 Changes in v2:
 -- do complete if (ret == IRQ_HANDLED) ay dp-aux_isr()
 -- add more commit text

 Changes in v3:
 -- add Stephen suggested
 -- dp_aux_isr() return IRQ_XXX back to caller
 -- dp_ctrl_isr() return IRQ_XXX back to caller

 Changes in v4:
 -- split into two patches

 Changes in v5:
 -- delete empty line between tags

 Changes in v6:
 -- remove extra that and fixed line more than 75 char at commit text

 Patchwork: https://patchwork.freedesktop.org/patch/516121/

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.

See Also

http://www.nessus.org/u?2f2b1c50

http://www.nessus.org/u?c1350428

https://nvd.nist.gov/vuln/detail/CVE-2022-48898

Plugin Details

Severity: Medium

ID: 268158

File Name: unity_linux_UTSA-2025-987025.nasl

Version: 1.1

Type: local

Published: 10/7/2025

Updated: 10/7/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

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-2022-48898

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: 9/23/2025

Vulnerability Publication Date: 8/21/2024

Reference Information

CVE: CVE-2022-48898