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.
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
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 12.15 (bookworm) | 5.16.7-1 | DEBIAN-CVE-2022-50232 | Jun 18, 2025 |
| linux · Debian 13.5 (trixie) | 5.16.7-1 | DEBIAN-CVE-2022-50232 | Jun 18, 2025 |
| linux · Debian 14 | 5.16.7-1 | DEBIAN-CVE-2022-50232 | Jun 18, 2025 |
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