arm64: set UXN on swapper page tables

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

EPSS (exploitation in 30 days)

0.20% · top 90% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

• Linux · Linux

  • affected 18107f8a2df6bf1c6cac8d0713f757f866d5af51 – < 775871d4be0d75e219cca937af843a4a1b60489a
  • affected 18107f8a2df6bf1c6cac8d0713f757f866d5af51 – < c3cee924bd855184d15bc4aa6088dcf8e2c1394c

• Linux · Linux

  • affected 5.13
  • unaffected < 5.13
  • unaffected 5.15.60 – ≤ 5.15.*
  • unaffected 6.0 – ≤ *

References (2)

• https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a (opens in a new tab)
• https://git.kernel.org/stable/c/c3cee924bd855184d15bc4aa6088dcf8e2c1394c (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2022-50232](https://trackcve.app/badge/CVE-2022-50232.svg)](https://trackcve.app/cve/CVE-2022-50232)

Record last updated 5 Nov 2026, 20:10 UTC.