{"id":"CVE-2022-50232","title":"arm64: set UXN on swapper page tables","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: set UXN on swapper page tables\n\n[ This issue was fixed upstream by accident in c3cee924bd85 (\"arm64:\n  head: cover entire kernel image in initial ID map\") as par…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 18107f8a2df6bf1c6cac8d0713f757f866d5af51 < 775871d4be0d75e219cca937af843a4a1b60489a","Linux >= 18107f8a2df6bf1c6cac8d0713f757f866d5af51 < c3cee924bd855184d15bc4aa6088dcf8e2c1394c","Linux 5.13"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:07:31.404271Z"},"published":"2025-06-18","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:10:30.206Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50232","references":[{"url":"https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a"},{"url":"https://git.kernel.org/stable/c/c3cee924bd855184d15bc4aa6088dcf8e2c1394c"}],"tags":["cve.org"],"epss":0.002,"epssPercentile":0.09901,"ingestedAt":"2026-11-05T22:38:31.707Z","slug":"CVE-2022-50232","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\narm64: set UXN on swapper page tables\n\n[ This issue was fixed upstream by accident in c3cee924bd85 (\"arm64:\n  head: cover entire kernel image in initial ID map\") as part of a\n  large refactoring of the arm64 boot flow. This simple fix is therefore\n  preferred for -stable backporting ]\n\nOn a system that implements FEAT_EPAN, read/write access to the idmap\nis denied because UXN is not set on the swapper PTEs. As a result,\nidmap_kpti_install_ng_mappings panics the kernel when accessing\n__idmap_kpti_flag. Fix it by setting UXN on these PTEs.\n\n## Affected\n\n- `Linux >= 18107f8a2df6bf1c6cac8d0713f757f866d5af51 < 775871d4be0d75e219cca937af843a4a1b60489a`\n- `Linux >= 18107f8a2df6bf1c6cac8d0713f757f866d5af51 < c3cee924bd855184d15bc4aa6088dcf8e2c1394c`\n- `Linux 5.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}