CVE-2022-50232 Information

Description

In the Linux kernel the following vulnerability has been resolved:

arm64: set UXN on swapper page tables

[ This issue was fixed upstream by accident in c3cee924bd85 (rm64: head: cover entire kernel image in initial ID map) as part of a large refactoring of the arm64 boot flow. This simple fix is therefore preferred for -stable backporting ]

On a system that implements FEAT_EPAN read/write access to the idmap is denied because UXN is not set on the swapper PTEs. As a result idmap_kpti_install_ng_mappings panics the kernel when accessing __idmap_kpti_flag. Fix it by setting UXN on these PTEs.

Reference

https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a

Related CNNVD

CNNVD-202506-2524 (Published: 2025-06-18)