CVE-2022-50232
MediumCVSS 5.5Summary
In the Linux kernel, the following vulnerability has been resolved: on arm64, UXN was not set on swapper page tables. On a system implementing 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. The fix sets UXN on these PTEs.
Risk Assessment
On affected arm64 systems with FEAT_EPAN, a kernel panic may occur during boot or idmap-related operations, leading to system unavailability. This requires a specific hardware configuration.
Recommendation
Upgrade the Linux kernel to a version containing the fix. If upgrade is not possible, avoid hardware configurations with FEAT_EPAN or consult your vendor.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS