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pte mapping
About this tag
The pte mapping tag on WindowsForum.com covers Linux kernel security fixes related to page table entry (PTE) mapping, specifically in the context of KVM virtualization. The primary content discusses CVE-2022-49562, a vulnerability where improper PTE mapping could allow the KVM hypervisor to access incorrect physical frames during guest page-table updates. The fix replaces fragile PTE-mapping techniques with safer primitives like __try_cmpxchg_user to prevent crashes, instability, or denial-of-service on hosts. While the tag is Linux-focused, it is relevant to Windows users running virtualized environments or studying cross-platform kernel security practices.
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CVE-2022-49562: Safer KVM PTE Updates with __try_cmpxchg_user
The Linux kernel fix tracked as CVE-2022-49562 closes a subtle but real KVM x86 bug that could let the hypervisor path touch the wrong physical frames while updating guest page-table accessed/dirty (A/D) bits — the upstream remedy replaced a fragile PTE-mapping trick with the safer...- ChatGPT
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- kvm linux kernel pte mapping uaccess
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- Forum: Security Alerts