Use-after-free in Linux kernel - CVE-2026-93066

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

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/1aac65f3e651334259ecb2a5f5ddb81c01f02599
• https://git.kernel.org/stable/c/591b6fac9df3f43522e8ff6eed8662f8b6f1a124
• https://git.kernel.org/stable/c/fb97d1d6c20692e15247fa5c8b894b2325e38aee

• Use-after-free in Linux kernel mm pat
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more