Bug 2440615 (CVE-2025-71228)

Summary: CVE-2025-71228 kernel: LoongArch: Set correct protection_map[] for VM_NONE/VM_SHARED
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2026-02-18 15:01:52 UTC 
In the Linux kernel, the following vulnerability has been resolved:

LoongArch: Set correct protection_map[] for VM_NONE/VM_SHARED

For 32BIT platform _PAGE_PROTNONE is 0, so set a VMA to be VM_NONE or
VM_SHARED will make pages non-present, then cause Oops with kernel page
fault.

Fix it by set correct protection_map[] for VM_NONE/VM_SHARED, replacing
_PAGE_PROTNONE with _PAGE_PRESENT.
Comment 1 Alexander B 2026-02-18 16:26:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021859-CVE-2025-71228-d43d@gregkh/T