CVE-2022-50232 (GCVE-0-2022-50232)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:04 – Updated: 2026-05-11 19:15
VLAI
Title
arm64: set UXN on swapper page tables
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 18107f8a2df6bf1c6cac8d0713f757f866d5af51 , < 775871d4be0d75e219cca937af843a4a1b60489a (git)
Affected: 18107f8a2df6bf1c6cac8d0713f757f866d5af51 , < c3cee924bd855184d15bc4aa6088dcf8e2c1394c (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.60 , ≤ 5.15.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "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 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."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: establecer UXN en las tablas de p\u00e1ginas del intercambiador [Este problema se corrigi\u00f3 accidentalmente en c3cee924bd85 (\"arm64: head: cubrir toda la imagen del kernel en el mapa de ID inicial\") como parte de una refactorizaci\u00f3n a gran escala del flujo de arranque de arm64. Por lo tanto, esta sencilla soluci\u00f3n es la preferida para la retroportaci\u00f3n de -stable]. En un sistema que implementa FEAT_EPAN, se deniega el acceso de lectura/escritura al mapa de ID porque UXN no est\u00e1 establecido en las PTE del intercambiador. Como resultado, idmap_kpti_install_ng_mappings genera un p\u00e1nico en el kernel al acceder a __idmap_kpti_flag. Se soluciona estableciendo UXN en estas PTE."
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}



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