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

Vulnerability from cvelistv5 – Published: 2025-06-18 11:04 – Updated: 2025-10-10 15:46
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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)
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2025-06-18T11:04:07.956Z",
    "dateReserved": "2025-06-18T10:57:27.432Z",
    "dateUpdated": "2025-10-10T15:46:07.476Z",
    "state": "PUBLISHED"
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