arm64: set UXN on swapper page tables
Published Jun 18, 2025
5.5
MEDIUMCVSS 3.1
EPSS 0.19%
Description
[ 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.
Affected products
-
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
-
- Version 5.13StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<5.13
- Version 5.15.60StatusunaffectedConstraints<=5.15.*
- Version 6.0StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
- ≥ 5.13 · < 5.15.60
- ≥ 5.16 · < 6.0
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Out of support scope
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Affected
Red Hat Enterprise Linux 9
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.19% (0.00195) | 8.31th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.17% (0.00169) | 6.49th | v5 (v2026.06.15) |
| Jun 18, 2025 | 0.02% (0.00018) | 3.07th | v4 (v2025.03.14) |
References (7)
- https://access.redhat.com/security/cve/CVE-2022-50232 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2373557 Issue Tracking
- https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a Patch
- https://git.kernel.org/stable/c/c3cee924bd855184d15bc4aa6088dcf8e2c1394c Patch
- https://lore.kernel.org/linux-cve-announce/2025061851-CVE-2022-50232-373d@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2022-50232
- https://www.cve.org/CVERecord?id=CVE-2022-50232
Change history (0)
No recorded changes yet.