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Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-387630)

medium Nessus Plugin ID 267807

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-2025-387630 advisory.

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

 drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip

 It's possible that mtk_crtc->event is NULL in mtk_drm_crtc_finish_page_flip().

 pending_needs_vblank value is set by mtk_crtc->event, but in mtk_drm_crtc_atomic_flush(), it's is not guarded by the same lock in mtk_drm_finish_page_flip(), thus a race condition happens.

 Consider the following case:

 CPU1 CPU2 step 1:
 mtk_drm_crtc_atomic_begin() mtk_crtc->event is not null, step 1:
 mtk_drm_crtc_atomic_flush:
 mtk_drm_crtc_update_config( !!mtk_crtc->event) step 2:
 mtk_crtc_ddp_irq -> mtk_drm_finish_page_flip:
 lock mtk_crtc->event set to null, pending_needs_vblank set to false unlock pending_needs_vblank set to true,

 step 2:
 mtk_crtc_ddp_irq -> mtk_drm_finish_page_flip called again, pending_needs_vblank is still true //null pointer

 Instead of guarding the entire mtk_drm_crtc_atomic_flush(), it's more efficient to just check if mtk_crtc->event is null before use.

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?91fca052

http://www.nessus.org/u?03e07719

https://nvd.nist.gov/vuln/detail/CVE-2024-26874

Plugin Details

Severity: Medium

ID: 267807

File Name: unity_linux_UTSA-2025-387630.nasl

Version: 1.2

Type: local

Published: 10/7/2025

Updated: 10/15/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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-2024-26874

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: 7/8/2025

Vulnerability Publication Date: 4/11/2024

Reference Information

CVE: CVE-2024-26874