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@]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2a62345b30529e488beb6a1220577b3495933724 to < dcdb476f5fc5701ec06c23efe3e3529f07ca391eaffected2a62345b30529e488beb6a1220577b3495933724 to < f13e900599089b10113ceb36013423f0837c6792affected
Linux Linux
Default version status: affected
7.0affected0 to < 7.0unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected