CVE-2025-40355: Linux 5.7

CVE-2025-40355 affects azl3 kernel 6.6.119.3-3 on Azure Linux 3.0. CVSS 3.1 base score 5.5 (Microsoft Security Response Center). EPSS 0.00186 (percentile 0.07763), scored 20-Oct-2026.

Affected technology

Linux · 303a42769c4c4d8e5e3ad928df87eb36f8c1fa60 to before 5e963b5aca9c1c23f7a040d555a9bc21c0ab8819, 303a42769c4c4d8e5e3ad928df87eb36f8c1fa60 to before ac2c526e103285d80a0330b91a318f6c9276d35a, 303a42769c4c4d8e5e3ad928df87eb36f8c1fa60 to before c7fbb8218b4ad35fec0bd2256d2b9c8d60331f33
Linux

Linux · 5.7
Linux

Component: Not specified by the source
File: fs/sysfs/group.c

Attack conditions (Microsoft Security Response Center, CVSS 3.1): Local · Low privileges required · No user interaction required

What an attacker can do

Microsoft Security Response Center’s CVSS 3.1 assessment rates confidentiality and integrity impact as none; availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 21-Oct-2026 16:29 UTC

Product: azl3 kernel 6.6.119.3-3 on Azure Linux 3.0
CCR priority: 22.0 /100 (P4)
CVSS 3.1: 5.5 /10 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · Microsoft Security Response Center
EPSS: 0.00186 · percentile 0.07763 · 2026-10-20
KEV: no

Provenance

FIRST EPSS daily exploit-probability · Source record · observed 2026-10-20 16:56:29.772392+00:00 UTC
GitHub Advisory Database · Source record · observed 2026-10-21 16:14:50.830645+00:00 UTC
Microsoft MSRC Security Update Guide (CVRF) · Source record · observed 2026-10-04 07:08:49.022374+00:00 UTC
NVD CVE API 2.0 · Source record · observed 2026-10-21 16:09:05.633125+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2025-40355.html