Linux Kernel Vulnerability in KVM Affecting NX Bit Handling
CVE-2022-50224
What is CVE-2022-50224?
A vulnerability in the Linux kernel's KVM module arises from improper handling of the NX (No-eXecute) bit in the Shadow Page Table Entry (SPTE) during Nested Page Table (NPT) operations. Specifically, KVM was not validating the NX bit as expected when the NX huge page mitigation feature was enabled. This oversight could trigger warnings and potential system instability when reserved SPTE bits are set incorrectly. The issue is particularly notable because KVM requires NX support for Secure Virtual Machine (SVM) to function properly, posing risks in environments reliant on virtualization for performance and security.
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Affected Version(s)
Linux b8e8c8303ff28c61046a4d0f6ea99aea609a7dc0 < 6271f2854b9233702e236e576b885a876dde4889
Linux b8e8c8303ff28c61046a4d0f6ea99aea609a7dc0 < 6c6ab524cfae0799e55c82b2c1d61f1af0156f8d
Linux a7ad7943b84fae87f5be18f05025c51ae103f732