SB20260918150 - Use-after-free in Linux kernel mm pat

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-93066)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

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