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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.69-37.134Upgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-toolsUpgrade python-perf-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade perfUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernelUpgrade perf-debuginfoUpgrade kernel-devel | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernelUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-tools-libs | Oct 14, 2025 | Sep 9, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perf | Sep 15, 2025 | Sep 9, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade python3-perfUpgrade kernel-tools-libsUpgrade kernelUpgrade kernel-toolsUpgrade kernel-abi-stablelists | Oct 24, 2025 | Sep 9, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 18, 2025 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Jun 18, 2025 |
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