Use-after-free in Linux kernel - CVE-2026-93066
Published: September 18, 2026
Vulnerability identifier: #VU150944
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93066
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause memory corruption or a denial of service.
The vulnerability exists due to a use-after-free in the x86 PAT page-attribute handling code when concurrently loading and unloading modules that operate on the same page middle directory. A local privileged user can concurrently load and unload modules to cause memory corruption or a denial of service.
The issue occurs when module text is served from a shared large read-only executable mapping.
Affected software
Linux kernel
How to mitigate CVE-2026-93066
Install security update from vendor's repository.