# CVE-2022-50232: arm64: set UXN on swapper page tables

CVE-2022-50232 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50232, released June 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-50232
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 18, 2025
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-50232

## 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 ("arm64:   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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.7-1 | [DEBIAN-CVE-2022-50232](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50232.md) | Jun 18, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.16.7-1 | [DEBIAN-CVE-2022-50232](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50232.md) | Jun 18, 2025 |
| Linux | linux Debian 14 | 5.16.7-1 | [DEBIAN-CVE-2022-50232](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50232.md) | Jun 18, 2025 |

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