{"id":"CVE-2026-99168","published":"2026-10-28T11:17:37.290","lastModified":"2026-10-28T11:17:37.290","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmshv_vtl: Check per-CPU register page before mmap\n\nRegister-page setup is optional for each CPU. If allocation or\nregistration fails, mshv_vtl_configure_reg_page() warns and leaves that\nCPU's reg_page NULL, but initial context setup continues successfully.\nMeanwhile, successful setup on another CPU sets the global\nmshv_has_reg_page flag.\n\nmshv_vtl_fault() checks this global flag before selecting the requested\nCPU's register page. With mixed setup results across online CPUs, the\ncheck passes even for a CPU with no register page, reaching\nget_page(NULL) when userspace faults in that mapping.\n\nCheck the selected per-CPU register page before taking its reference and\nreturn VM_FAULT_SIGBUS if it is absent.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/5c0757b065fbd140d8fbd05dc2c2146b713dfa68","tags":[]},{"url":"https://git.kernel.org/stable/c/874194a8de75fc2f4d1fb70c670b289b7e48f93e","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}