Riskcovery

CVE-2022-50232

arm64: set UXN on swapper page tables

State
Published
Severity
Not scored
Published
Jun 18, 2025
Updated
May 11, 2026
Reserved
Jun 18, 2025

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 18107f8a2df6bf1c6cac8d0713f757f866d5af51 to before 775871d4be0d75e219cca937af843a4a1b60489aAffected
  • 18107f8a2df6bf1c6cac8d0713f757f866d5af51 to before c3cee924bd855184d15bc4aa6088dcf8e2c1394cAffected
LinuxLinux
  • 5.13Affected
  • before 5.13Not affected
  • 5.15.60 through 5.15.*Not affected
  • 6.0 and laterNot affected

References

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