CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's KVM component, specifically in the handling of CPUID data for Secure Nested Paging (SNP) guests. An improper pinning mechanism could allow KVM to overwrite read-only memory, potentially leading to data corruption or system instability. Organizations utilizing KVM with SNP guests should prioritize this issue, particularly those with custom or non-standard configurations that may expose them to this risk.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Pin source page for write when adding CPUID data for SNP guest When populating a guest_memfd instance with the initial CPUID data for an SNP guest, acquire a writable pin on the source page as KVM will write back the "correct" CPUID information if the userspace provided data is rejected by trusted firmware. Because KVM writes to the source page using a kernel mapping, pinning for read could result in KVM clobbering read-only memory. Note, well-behaved VMMs are unlikely to be affected, as CPUID information is almost always dynamically generated by userspace, i.e. it's unlikely for the CPUID information to be backed by a read-only mapping. [sean: rewrite shortlog and changelog, tag for stable@]
Related CVEs
Other vulnerabilities affecting the same vendor(s)