CVE-2026-64309

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)<br /> <br /> Sashiko notes:<br /> <br /> &gt; if SEV initialization fails and KVM is actively running normal VMs, could a<br /> &gt; userspace process trigger this code path via /dev/sev ioctls (e.g.,<br /> &gt; SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN<br /> &gt; execution for an active VM trigger a general protection fault and crash the<br /> &gt; host?<br /> <br /> The SNP_COMMIT command does not require the firmware to be in any<br /> particular state. Skip initializing it if it was previously uninitialized.<br /> <br /> The SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in<br /> Table 5 as a command that is allowed in the UNINIT state, but it is in fact<br /> allowed and a future documentation update will reflect that.