{"schema":"threatline.record/2","record":{"id":"CVE-2026-99168","aliases":[],"summary":"mshv_vtl: Check per-CPU register page before mmap","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99168","source_modified_at":"2026-10-28T10:35:19.539Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f","lessThan":"5c0757b065fbd140d8fbd05dc2c2146b713dfa68","status":"affected","versionType":"git"},{"version":"7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f","lessThan":"874194a8de75fc2f4d1fb70c670b289b7e48f93e","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99168","source_modified_at":"2026-10-28T10:35:19.539Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.19","status":"affected"},{"version":"0","lessThan":"6.19","status":"unaffected","versionType":"semver"},{"version":"7.2.13","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99168","source_modified_at":"2026-10-28T10:35:19.539Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"5c0757b065fbd140d8fbd05dc2c2146b713dfa68","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99168","source_modified_at":"2026-10-28T10:35:19.539Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"874194a8de75fc2f4d1fb70c670b289b7e48f93e","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T10:35:19.539Z","modified_at":"2026-10-28T10:35:19.539Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99168","fetched_at":"2026-10-28T15:55:58.673066Z","source_modified_at":"2026-10-28T10:35:19.539Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/5c0757b065fbd140d8fbd05dc2c2146b713dfa68"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/874194a8de75fc2f4d1fb70c670b289b7e48f93e"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-28T10:35:19.539Z","content_hash":"b7dc91f01e48d296b6c7f30a95c84b478786cf9a0c5b9454e7d04a86fb085e69"}}