CVE-2026-89778: Linux 2.6.33

CVE-2026-89778 affects azl3 kernel 6.6.150.1-1 on Azure Linux 3.0. CVSS 3.1 base score 9.8 (CRITICAL, Source advisory). EPSS 0.00697 (percentile 0.52577), scored 24-Oct-2026. Fixed version: 8b994ac5778a725982fd6a8a3afcaa068d4a93e3. Fixed version: ad3249cdf9d4ba34bb8b1ff3956a4020fdfb5b0a. Fixed version: 85904076cece72ee3194646ad7ac8e6659d999aa. Fixed version: f03425dcbe04aec3c27b9917e97d7d23a2908dda. Fixed version: cd616aa0449a772a6956abf03358f0ff31720580. Fixed version: 9c6eace8d07e90f038c89eb3b756d65a7e259d48. Fixed version: 68d4d3e78150c7ed7d1195af63ad1e6ace30c661.

Affected technology

Linux · 59bc055211b8d266ab6089158058bf8268e02006 to before 8b994ac5778a725982fd6a8a3afcaa068d4a93e3, 59bc055211b8d266ab6089158058bf8268e02006 to before ad3249cdf9d4ba34bb8b1ff3956a4020fdfb5b0a, 59bc055211b8d266ab6089158058bf8268e02006 to before 85904076cece72ee3194646ad7ac8e6659d999aa, 59bc055211b8d266ab6089158058bf8268e02006 to before f03425dcbe04aec3c27b9917e97d7d23a2908dda, 59bc055211b8d266ab6089158058bf8268e02006 to before cd616aa0449a772a6956abf03358f0ff31720580, 59bc055211b8d266ab6089158058bf8268e02006 to before 9c6eace8d07e90f038c89eb3b756d65a7e259d48, 59bc055211b8d266ab6089158058bf8268e02006 to before 68d4d3e78150c7ed7d1195af63ad1e6ace30c661
Linux

Linux · 2.6.33
Linux

Component: Not specified by the source
File: fs/isofs/compress.c

Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Source advisory’s CVSS 3.1 assessment (base score 9.8/10) rates confidentiality, integrity and availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.

Published 25-Oct-2026 10:20 UTC

Product: azl3 kernel 6.6.150.1-1 on Azure Linux 3.0
CCR priority: 39.4 /100 (P4)
CVSS 3.1: 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · Source advisory
EPSS: 0.00697 · percentile 0.52577 · 2026-10-24
KEV: no

Provenance

FIRST EPSS daily exploit-probability · Source record · observed 2026-10-24 15:09:16.138216+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 2026-10-19 10:33:46.008150+00:00 UTC
OSV.dev · Source record · observed 2026-10-25 01:59:11.642217+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-89778.html